Organic “receptor” fully covered few-layer organic-metal chalcogenides for high-performance chemiresistive gas sensing at room temperature

Article abstract of DOI:10.1039/d0cc01092h

Organic-metal chalcogenides (OMCs) are proposed as a new family of two-dimensional (2D) chemiresistive sensing materials. Few-layer Ag(SPh-NH₂), one of the OMCs, fully and orderly covered with predesigned -NH₂groups as “receptors”, s

Full text of DOI:10.1039/d0cc01092h

View Article Online
View Journal
ChemComm
Chemical Communications
Accepted Manuscript
This article can be cited before page numbers have been issued, to do this please use: H. Jiang, L. Cao,
Y. Li, W. Li, X. Ye, W. H. Deng, X. Jiang, G. Wang and G. Xu, Chem. Commun., 2020, DOI:
10.1039/D0CC01092H.
Volume 54
This is an Accepted Manuscript, which has been through the
Number
January 2018
Pages 1-112
1
4
Royal Society of Chemistry peer review process and has been
accepted for publication.
ChemComm
Chemical Communications
rsc.li/chemcomm
Accepted Manuscripts are published online shortly after acceptance,
before technical editing, formatting and proof reading. Using this free
service, authors can make their results available to the community, in
citable form, before we publish the edited article. We will replace this
Accepted Manuscript with the edited and formatted Advance Article as
soon as it is available.
You can find more information about Accepted Manuscripts in the
Information for Authors.
Please note that technical editing may introduce minor changes to the
text and/or graphics, which may alter content. The journal’s standard
Terms & Conditions and the Ethical guidelines still apply. In no event
shall the Royal Society of Chemistry be held responsible for any errors
or omissions in this Accepted Manuscript or any consequences arising
from the use of any information it contains.
ISSN 1359-7345
COMMUNICATION
S. J. Connon, M. O. Senge et al.
Conformational control of nonplanar free base porphyrins:
towards bifunctional catalysts of tunable basicity
rsc.li/chemcomm

Please do not adjust margins
Page 1 of 5
ChemComm
View Article Online
DOI: 10.1039/D0CC01092H
COMMUNICATION
Organic “Receptor” Fully Covered Few-layer Organic-metal
Chalcogenide for High-Performance Chemiresistive Gas Sensing at
Room Temperature†
Received 00th January 20xx,
Accepted 00th January 20xx
Huijie Jiang,ab Linan Cao,ab Yanzhou Li,a Wenhua Li,a Xiaoliang Ye,a Weihua Deng,ab Xiaoming Jiang,a
GuanE. Wang,a and Gang Xu*ab
DOI: 10.1039/x0xx00000x
Organic-metal chalcogenides (OMCs) are proposed as a new family ethylenediamine (S-G, EDA-G) treated reduced graphene oxide
of two-dimensional (2D) chemiresistive sensing materials. Few- (rGO) materials showed 16.4 and 4.3 times higher responses to
layer Ag(SPh-NH2), one of OMCs, fully and orderly covered with NO2 than that of pristine rGO, respectively.26 Compared with
predesigned –NH2 groups as “receptors”, shows highest sensitivity, non-functionalized rGO, chemically fluorinated GO (CFGO)
excellent selectivity and reversibility to NO2 among all reported 2D displayed enhanced selectivity between NH3 and NO2 by 3.65
chemiresistive sensing materials at room temperature.
times.28 However, the known post-treated 2D materials
normally have a relative low ratio of modified surface and
inhomogeneous distribution of functional groups. This
profoundly hinders us to achieve higher sensing performances
with the known 2D materials and their derivatives.
Recently, a new type of semiconducting 2D materials,
organic-metal chalcogenides (OMCs) are emerging.29-30 these of
other 2D materials, the surfaces of OMCs are fully and orderly
covered by organic functional groups. Our previous work
revealed that the conductivity of OMCs is very sensitive to the
electronic structure of these organic groups. A change of 106
times on their conductivity was observed when varying the type
of organic groups on them. Since the electronic structure of
these organic groups would be influenced after adsorbing
foreign gas molecules, we proposed that OMCs may possess hi-
Chemiresistors have attractive intensive research interest due
to their fascinating features, such as high sensitivity, fast
response, low fabrication cost, and real-time detection. Metal
oxides are the dominant and key sensing materials for
chemiresistive sensors. However, the applications of metal
oxides sensors are significantly hampered by their unsatisfying
selectivity and high operating tem-perature.1-3 Therefore, it is of
great importance to develop new sensing materials that possess
high sensitivity and selectivity toward target gases for room
temperature (RT) operation.
Two-dimensional (2D) materials, such as graphene and its
derivatives,4-5 transition metal dichalcogenides (TMDs),6-8 black
phosphorus (BP),7-10 2D metal-organic frameworks (MOFs),11-20
2D covalent-organic frameworks (COFs)21 etc., have obtained
increasing attention as chemiresistive gas sensing materials.22
Compared with their bulk counter-parts, 2D materials possess
fascinating features for gas sensing, such as larger surface-to-
volume ratio, more accessible active sites, better charge
transport, and good processability,23 which endow the thin films
made from them with good gas sensing performance at RT19-
20,24-25. We noticed that the sensitivity and selectivity of these
2D materials were significantly enhanced by modifying their
surfaces with organic functional groups owing to the enhanced
interactions between 2D materials and target gases.26-28 For
example, Shi’s group reported that sulfanilic acid and
a.State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the
Structure of Matter, Chinese Academy of Sciences (CAS), No. 155 Yangqiao Road
West, Fuzhou, Fujian, 350002, P. R. China.
Fig. 1 (a), (c) Mono-layer structure of Ag(SPh-NH2) and Ag(SPh). (b) 2D {AgS}n layer
of Ag(SPh-NH2) and Ag(SPh). Hydrogen atoms of benzene ring have been omitted
for clarity. (d) Experimental and stimulated PXRD patterns of Ag(SPh-NH2). (e) SEM
image of few-layer Ag(SPh-NH2), inset is its selected area electron diffraction. (f)
Typical AFM image of few-layer Ag(SPh-NH2).
b.University of Chinese Academy of Sciences (UCAS), No. 19A Yuquan Road, Beijing
100049, P. R. China.
†
Electronic Supplementary Information (ESI) available: [Experimental details, Fig.
S1-S18, Tab. S1-S4 See DOI: 10.1039/x0xx00000x
Please do not adjust margins

Please do not adjust margins
ChemComm
Page 2 of 5
COMMUNICATION
Journal Name
gh sensitivity as a chemiresistive sensing material at RT. More
importantly, these organic functional groups of OMCs can be
designed with the required structure to enhance their affinity
to the target gas. Therefore, a “made to order” selectivity which
is desired for sensing materials may be realized in OMCs.
View Article Online
DOI: 10.1039/D0CC01092H
Herein, we report the first study of OMCs which possess a
very high ratio of organic functionalized surfaces as highly
sensitive and selective RT chemiresistive gas sensing materials.
As a proof-of-concept, a few-layer OMC, Ag(SPh-NH2), was
prepared for detecting NO2. The 2D {AgS}n layers of Ag(SPh-NH2)
are fully covered by ordered –NH2 groups. This design
remarkably enhanced the sensitivity and selectivity of OMCs to
NO2 owing to –NH2 groups can be regarded as “receptors” to
strongly interact with NO2 through hydrogen bond, acid-base
interaction etc. As a result, at RT, the few-layer Ag(SPh-NH2) thin
film showed not only the highest sensitivity and fastest
Fig. 2 (a) Fabrication of Ag(SPh-NH2) thin film for gas sensing test. (b) Typical HR-
SEM of the prepared Ag(SPh-NH2) thin films. (c) I-V curves of Ag(SPh-NH2) thin
films.
response
& recovery speed among all reported 2D
chemiresistive sensing materials and their modified derivatives,
but also very unique selectivity among 12 commonly existed
interference gases.
Ag(SPh-NH2) is ~11 nm, indicating the stack of ~6 molecule
layers (Fig. 1f). Likewise, the plate morphology of as-prepared
few-layer Ag(SPh) was confirmed with an average thickness of
~20 nm (Fig. S8-9).
Few-layer Ag(SPh-NH2) was directly synthesized by the
coordination reaction between Ag ions and HSPh-NH2 (4-
Aminobenzenethiol) in hydrothermal condition at 85 oC. For
control experiments, Ag(SPh) (HSPh = benzenethiol), an
isostructure of Ag(SPh-NH2), was prepared with a similar
synthetic method (experimental details see ESI). The
experimental powder X-ray diffraction pattern (PXRD) of
Ag(SPh-NH2) and Ag(SPh) are in good agreement with their
simulated or reported ones, verifying their phase purity (Fig. 1d
and Fig. S1).31 Fourier transform infrared spectroscopy (FT-IR)
and elemental analysis measurements further confirmed their
structures and purities (Fig. S2-3, Tab. S1).
The electrical and optical characterizations reveal that
Ag(SPh-NH2) is a p-type semiconductor with a conductivity of
6*10-7 S cm-1 at RT and a band gap of 2.62 eV, respectively.30
The sensing performances of few-layer Ag(SPh-NH2) were
evaluated by preparing it into thin film on quartz substrates
through conventional spin-coating method and then depositing
patterned gold on it as interdigital electrodes via thermal
evaporation (Fig. 2a, details see ESI). These thin films have
continuous and homogeneous morphology (Fig. 2b). They also
showed similar conductivity and ohmic contact with gold
electrodes, indicating their good reproducibility (Fig. 2c). The
sensing tests of few-layer Ag(SPh-NH2) thin films were
conducted by putting them into the sealed quartz chamber of a
home-made test equipment and recorded the current of
sensing material in different atmospheres (details see ESI).34 All
tests were performed at RT.
NO2 is one of the major global gas pollutants and very toxic
even at low concentrations. The performances of NO2 sensing
materials were reported to be significantly enhanced by
decorating the surface of them with –NH2 contained
molecules.26,35 Inspired by this, few-layer Ag(SPh-NH2) thin film
is expected to show high RT sensing performances, because its
surfaces are fully and orderly covered by –NH2 groups which are
effective “receptors” for NO2. As shown in Fig. 3a, when
exposed to 10 ppm NO2, few-layer Ag(SPh-NH2) thin film
exhibited that its current dramatically increased and reached a
In the structure of mono-layer Ag(SPh-NH2) and Ag(SPh) (Fig.
1a,c), each Ag+ ion coordinates with three μ3-bridging S atoms
in
a trigonal planar configuration to form a distorted
honeycomb 2D {AgS}n layer (Fig. 1b). The organic functional
groups alternatively and covalently bond to S atoms on the top
and bottom surfaces of {AgS}n layer. The thickness of mono-
layer Ag(SPh-NH2) and Ag(SPh) is ~1.7 nm and 1.4 nm,
respectively. These mono-layers are parallelly packing with each
other along c axis to form few-layer Ag(SPh-NH2) and Ag(SPh)
(Fig. S4-5). The +1 valence of Ag was confirmed by the high-
resolution X-ray photoelectron spectroscopy (XPS) spectra of
few-layer Ag(SPh-NH2) and Ag(SPh). Meanwhile, the binding
energy of N1s for Ag(SPh-NH2) was determined to be ~400 eV
which is the same as that of phenylamine, suggesting that the
amine groups on the surface of few-layer Ag(SPh-NH2) are
accessible to target gas molecules (Fig. S6-7).32
Scanning electron microscopy (SEM) measurements revealed saturation. After refilling the chamber with dry air, few-layer
that the nanobelt morphology of as-prepared few-layer Ag(SPh-
NH2) with a length of several micrometers and a width of ~500 coefficient of variation (CV) is only 6.92% in five continuous
nanometers (Fig. 1e). The selected area electron diffraction
pattern of TEM showed sharp and ordered spot arrays, see Tab. S2). Few-layer Ag(SPh-NH2) also showed good
indicating the good crystallinity of few-layer Ag(SPh-NH2) (insert
of Fig. 1e). The plane distances were measured to be 7.25 Å and (0.1-100 ppm) (Fig. 3a and Fig. S13). In addition, Ag(SPh-NH2)
Ag(SPh-NH2) recovered to its initial resistance. The response
cycles, which indicates excellent repeatability (Response values
response-recovery ability to a broad concentration range of NO2
5.78 Å along a and b directions, respectively, which consist well
thin film before and after NO2 sensing tests show almost the
with the simulated results.33 Atomic force microscope (AFM) same PXRD (Fig. S14), indicating it is stable in NO2 atmosphere.
measurement showed the average thickness of few-layer Notably, compared with the reported 2D chemiresistive sensing
2 | J. Name., 2012, 00, 1-3
This journal is © The Royal Society of Chemistry 20xx
Please do not adjust margins

Page 3 of 5
ChemComm
Please do not adjust margins
Journal Name
COMMUNICATION
View Article Online
DOI: 10.1039/D0CC01092H
Fig. 3 (a) Response-recovery curve of Ag(SPh-NH2) thin film to NO2 with different
concentrations at RT. (b) Linear log-log plot of response vs concentration of
Ag(SPh-NH2) thin film to NO2 and their comparison with reported 2D chemire-
sistive sensing materials working at RT (details see Tab. S3). (c) Response-recovery
curve to 10 ppm NO2. (d) Cross-sensitivities of Ag(SPh-NH2) thin film to 13 types of
gases, inset is the real-time measurement (details see Tab. S4).
Fig. 4 (a) Response-recovery curves of Ag(SPh-NH2) (blue) and Ag(SPh) (black) to
10 ppm NO2. (b) In-situ DRIFT Spectra for Ag(SPh-NH2) exposed to NO2 as a
function of time. (c) Possible NO2 sensing mechanism for Ag(SPh-NH2).
materials, few-layer Ag(SPh-NH2) exhibits the highest response
to NO2 in whole above-mentioned concentration range (Fig. 3b
and Tab. S3).
The response-concentration log-log plot of few-layer Ag(SPh-
NH2) is shown in Fig. 3b. The good linearity (R2 = 0.987) in the
range of 0.1-100 ppm is consistent with these of typical
chemiresistive sensing materials.34 Accordingly, the theoretical
limit of detection (LOD) was calculated to be 0.9 ppb by setting
R = 10%, which is the lowest value in all reported 2D
chemiresistive sensing materials and good enough to achieve
the detection of trace NO2.36 Few-layer Ag(SPh-NH2) also
showed fast response and recovery speed (Fig. 3c). The
response and recovery time are calculated to be 1.0 and 2.3
minutes, respectively. These values suggest that few-layer
Ag(SPh-NH2) is the fastest 2D chemiresistive sensing material to
NO2 at RT reported so far (Tab. S3).
Compared with their gaseous state, the adsorbed NO2 and N2O4
showed slight shift. Meanwhile, O-H bending vibration at 1591
cm-1 was also observed (Fig. 4b).40 These observations revealed
the formation of hydrogen bond through O atoms of N2O4 / NO2
and H atoms of -NH2 groups. During the above process, none of
the peaks related to diazonium salt (2280 cm-1) or nitrates (1350
cm-1) was detected,37-38 indicating a strong adsorption of NO2 on
Ag(SPh-NH2). Notably, the intensity change of -NH2 and N2O4
related peaks was synchronous, which revealed a strong
interaction between -NH2 and adsorbed N2O4. Above results
demonstrated the critical role of –NH2 groups as a functional
motif played in Ag(SPh-NH2) sensing material.41-42
The organic “receptor” fully covered structure of few-layer
Ag(SPh-NH2) not only enhanced the sensitivity but also provided
excellent selectivity to NO2 (Fig. 3d). It showed very weak
responses (< 20%) toward 12 commonly existed interference
gases including SO2, a typical interference gas for NO2 detection
(Response values see Tab. S4), indicating that few-layer Ag(SPh-
NH2) is capable to selectively distinguish NO2 from its
interference gases. To shed more light on the relationships
between crystal structure and sensing performances, Ag(SPh), a
p-type semiconducting isostructure of Ag(SPh-NH2), was
investigated (Fig. 1c, S15-17). However, different from Ag(SPh-
NH2), Ag(SPh) did not display any observable response to 10
ppm NO2 (Fig. 4a). This result suggests that -NH2 groups are
crucial for detecting NO2. To uncover more details, in-situ
diffuse reflectance infrared Fourier transform spectroscopy
(DRIFTS) measurements were performed by exposing Ag(SPh-
NH2) in NO2 atmosphere to study the their interactions (Fig. 4b
and Fig. S18). With the increasing exposure time, the intensity
A possible mechanism of NO2 detection with Ag(SPh-NH2) is
proposed as following (Figure 4c): when NO2 approaches the
surface of Ag(SPh-NH2), it firstly contacts with the –NH2 groups
through strong interaction (e.g. acid-based interaction,
hydrogen bond)43 in the form of NO2 / N2O4; simultaneously,
charge transfer from Ag(SPh-NH2) to NO2 and N2O4 would
happen which increases the concentration of hole carriers for
p-type Ag(SPh-NH2); finally Ag(SPh-NH2) shows a positive
response by increasing its current; once NO2 and N2O4
molecules are swept away by purging gases from the surface of
Ag(SPh-NH2), the current recovers to its initial value.
In conclusion, OMCs, a family of newly emerging inorganic 2D
materials, were demonstrated as a kind of designable high-
performance RT chemiresitive gas sensing materials for the first
time. This was realized by preparing few-layer Ag(SPh-NH2), a
member of OMCs, and ap-plied it in NO2 detection. Ag(SPh-NH2)
possesses a semi-conducting {AgS}n layer and –NH2 groups fully
of the peaks for -NH2 vibrations (3380 and 3301 cm-1) and C-N and orderly covered surfaces. The comparison of the sensing
(1251 cm-1) stretching vibration decreased dramatically.37 The
performances between Ag(SPh-NH2) and its isostructure,
peak at 3190 cm-1 decreased obviously can be assigned to the
Ag(SPh), and in-situ DRIFTS measurements of Ag(SPh-NH2) in
NO2 atmosphere revealed –NH2 groups are effective “receptors”
overtone of N-H bending vibration. Meanwhile, four new peaks
belonging to NO2 (1505 and 1318 cm-1) and N2O4 (1496, 1319
to interact with NO2 and play the critical role in dramatically
cm-1 and 1287, 1224 cm-1, the dimer of NO2) were observed to
enhancing its sensing sensitivity and selectivity. As a result, it
increase their intensities with extending the exposure time.38-39
shows the highest response value, lowest LOD, and fastest
This journal is © The Royal Society of Chemistry 20xx
J. Name., 2013, 00, 1-3 | 3
Please do not adjust margins

Please do not adjust margins
ChemComm
Page 4 of 5
COMMUNICATION
Journal Name
20 M. S. Yao, J. W. Xiu, Q. Q. Huang, W. H. Li, W. WV.ieWwuA,rtiAcl.eQOn.line
response & recovery speed to NO2 in all reported 2D
chemiresistive sensing materials at RT. Moreover, it also shows
excellent selectivity towards 12 commonly existed interference
gases for NO2 detection. Given that the organic function groups
on OMCs can be flexibly designed for different gas detection
purposes, our work should bring great inspiration in designing
and producing the next generation of highly selective and
sensitive sensing materials for RT operation.
This work was supported by the NSF of China (21822109,
21975254, 21805276, 21905280), Key Research Program of
Frontier Science, CAS (QYZDB-SSWSLH023), the Strategic
Priority Research Program of CAS (XDB20000000), International
Partnership Program of CAS (121835KYSB201800), and Youth
Innovation Promotion Association CAS.
Wu, L. A. Cao, W. H. Deng, G. E. Wang, G. Xu, Angew. Chem.
DOI: 10.1039/D0CC01092H
Int. Ed., 2019, 58, 14915.
21 Z. Meng, R. M. Stolz and K. A. Mirica, J. Am. Chem. Soc.,
2019, 141, 11929.
22 S. J. Choi and I. D. Kim, Electron. Mater. Lett., 2018, 14, 221.
23 Z. Meng, R. M. Stolz, L. Mendecki and K. A. Mirica, Chem.
Rev., 2019, 119, 478.s
24 F. Yavari, E. Castillo, H. Gullapalli, P. M. Ajayan and N.
Koratkar, App. Phy. Lett., 2012, 100, 203120.
25 B. Cho, A. R. Kim, Y. Park, J. Yoon, Y. J. Lee, S. Lee, T. J. Yoo, C.
G. Kang, B. H. Lee, H. C. Ko, D. H. Kim and M. G. Hahm, ACS.
Appl. Mater. Inter., 2015, 7, 2952.
26 K. Lee, R. Gatensby, N. McEvoy, T. Hallam and G. S.
Duesberg, Adv. Mater., 2013, 25, 6699.
27 J. S. Kim, H. W. Yoo, H. O. Choi and H. T. Jung, Nano Lett.,
2014, 14, 5941.
28 Y. H. Kim, J. S. Park, Y. R. Choi, S. Y. Park, S. Y. Lee, W. Sohn,
Y. S. Shim, J. H. Lee, C. R. Park, Y. S. Choi, B. H. Hong, J. H.
Lee, W. H. Lee, D. Lee and H. W. Jang, J. Mater. Chem. A,
Conflicts of interest
There are no conflicts to declare.
2017, 5, 19116.
29 Y. Z. Li, J. Shu, Q. Q. Huang, K. Chiranjeevulu, P. N. Kumar, G.
E. Wang, W. H. Deng, D. Tang and G. Xu, Chem. Commun.,
2019, 55, 10444.
30 Y. Z. Li, X. M. Jiang, Z. H. Fu, Q. Q. Huang, G. E. Wang, W. H.
Deng, C. Wang, Z. Z. Li, W. J. Yin, B. L. Chen and G. Xu, Nat.
Commun., 2020, 11, 261.
Notes and references
1
2
3
4
E. Comini, C. Baratto, G. Faglia, M. Ferroni, A. Vomiero and
G. Sberveglieri, Prog. Mater. Sci., 2009, 54, 1.
S. Chen, Y. Tang, K. Zhan, D. Sun and X. Hou, Nano Today,
2018, 20, 84.
Y. Liu, R. Bao, J. Tao, J. Li, M. Dong and C. Pan, Sci. Bull.,
2020, 60, 70.
V. Dua, S. P. Surwade, S. Ammu, S. R. Agnihotra, S. Jain, K. E.
Roberts, S. Park, R. S. Ruoff and S. K. Manohar, Angew.
Chem. Int. Ed., 2010, 49, 2154.
31 L. G. Dance, K. J. Fisher, R. M. Herath Banda, M. L. Scudder,
R. M. Herath Banda and M. L. Scudder, Inorg. Chem., 1991,
30, 183.
32 H. Yu, P. Xiao, J. Tian, F. Wang and J. Yu, ACS Appl. Mater.
Inter., 2016, 8, 29470.
33 K. H. Low, V. A. Roy, S. S. Chui, S. L. Chan and C. M. Che,
Chem. Commun., 2010, 46, 7328.
34 M. S. Yao, W. X. Tang, G. E. Wang, B. Nath and G. Xu, Adv.
Mater., 2016, 28, 5229.
5
6
7
8
9
E. Singh, M. Meyyappan and H. S. Nalwa, ACS Appl. Mater.
Inter., 2017, 9, 34544.
35 M. W. G. Hoffmann, J. D. Prades, L. Mayrhofer, F. Hernandez-
Ramirez, T. T. Järvi, M. Moseler, A. Waag and H. Shen, Adv.
Funct. Mater., 2014, 24, 595.
J. Feng, L. Peng, C. Wu, X. Sun, S. Hu, C. Lin, J. Dai, J. Yang and
Y. Xie, Adv. Mater., 2012, 24, 1969.
F. K. Perkins, A. L. Friedman, E. Cobas, P. M. Campbell, G. G.
Jernigan and B. T. Jonker, Nano Lett., 2013, 13, 668.
W. Yuan, A. Liu, L. Huang, C. Li and G. Shi, Adv. Mater., 2013,
25, 766.
36 J. S. Kim, J. W. Yoon, Y. J. Hong, Y. C. Kang, F. Abdel-Hady, A.
A. Wazzan and J. H. Lee, Sens. Actuators B Chem., 2016, 229
561.
,
37 G. W. Peterson, J. J. Mahle, J. B. DeCoste, W. O. Gordon and
J. A. Rossin, Angew. Chem. Int. Ed., 2016, 55, 6235.
38 E. Flores, J. Viallon, P. Moussay, F. Idrees and R. I. Wielgosz,
Anal. Chem., 2012, 84, 10283.
S. Y. Cho, Y. Lee, H. J. Koh, H. Jung, J. S. Kim, H. W. Yoo, J. Kim
and H. T. Jung, Adv. Mater., 2016, 28, 7020.
10 S. Y. Cho, H. J. Koh, H. W. Yoo and H. T. Jung, Chem. Mater.,
2017, 29, 7197.
39 C. Yu, H. Z. Lin, J. Zhou, X. F. Cheng, J. H. He, H. Li, Q. F. Xu, N.
11 M. G. Campbell, D. Sheberla, S. F. Liu, T. M. Swager and M.
Dincă, Angew. Chem. Int. Ed., 2015, 54, 4349.
12 M. G. Campbell, S. F. Liu, T. M. Swager and M. Dincă, J. Am.
Chem. Soc., 2015, 137, 13780.
J. Li, D. Y. Chen and J. M. Lu, J. Mater. Chem. A, 2020, 8,
1052.
40 B. Tyagi, C. D. Chudasama and R. V. Jasra, Spectrochimica
Acta Part A, 2006, 64, 273.
13 M. K. Smith and K. A. Mirica, J. Am. Chem. Soc., 2017, 139
,
41 G. C. Guo, Y. G. Yao, K. C. Wu, L. Wu and J. S. Huang, Prog.
Chem., 2001, 13, 151.
42 S.P. Guo, Y. Chi and G. C. Guo, Coord. Chem. Rev., 2017, 335
44.
43 G. W. Peterson, M. McEntee, C. R. Harris, A. D. Klevitch, A.
W. Fountain, J. R. Soliz, A. Balboa and A. J. Hauser, Dalton.
Trans., 2016, 45, 17113.
16759.
14 Y. Ding, Y. P. Chen, X. Zhang, L. Chen, Z. Dong, H. L. Jiang, H.
Xu and H. C. Zhou, J. Am. Chem. Soc., 2017, 139, 9136.
15 R. Dong, Z. Zhang, D. C. Tranca, S. Zhou, M. Wang, P. Adler, Z.
Liao, F. Liu, Y. Sun, W. Shi, Z. Zhang, E. Zschech, S. C. B.
,
Mannsfeld, C. Felser and X. Feng, Nat. Commun., 2018, 9,
2637.
16 M. Zhao, Y. Huang, Y. Peng, Z. Huang, Q. Ma and H. Zhang,
Chem. Soc. Rev., 2018, 47, 6267.
17 M. S. Yao, J. J. Zheng, A. Q. Wu, G. Xu, S. S. Nagarkar, G.
Zhang, M. Tsujimoto, S. Sakaki, S. Horike, K. Otake, and S.
Kitagawa, Angew. Chem. Int. Ed., 2020, 59, 172.
18 W. T. Koo, J. S. Jang and I. D. Kim, Chem, 2019, 5, 1938.
19 M. S. Yao, X. J. Lv, Z. H. Fu, W. H. Li, W. H. Deng, G. D. Wu
and G. Xu, Angew. Chem. Int. Ed., 2017, 56, 16510.
4 | J. Name., 2012, 00, 1-3
This journal is © The Royal Society of Chemistry 20xx
Please do not adjust margins

Page 5 of 5
ChemComm
View Article Online
DOI: 10.1039/D0CC01092H
Table of contents
2D organic-metal chalcogenides (OMCs), were developed as a new type of materials for high-
performance RT gas sensing.