38351-46-1Relevant academic research and scientific papers
A Unique Ternary Semiconductor-(Semiconductor/Metal) Nano-Architecture for Efficient Photocatalytic Hydrogen Evolution
Zhuang, Tao-Tao,Liu, Yan,Sun, Meng,Jiang, Shen-Long,Zhang, Ming-Wen,Wang, Xin-Chen,Zhang, Qun,Jiang, Jun,Yu, Shu-Hong
, p. 11495 - 11500 (2015)
It has been a long-standing demand to design hetero-nanostructures for charge-flow steering in semiconductor systems. Multi-component nanocrystals exhibit multifunctional properties or synergistic performance, and are thus attractive materials for energy conversion, medical therapy, and photoelectric catalysis applications. Herein we report the design and synthesis of binary and ternary multi-node sheath hetero-nanorods in a sequential chemical transformation procedure. As verified by first-principles simulations, the conversion from type-I ZnS-CdS heterojunction into type-II ZnS-(CdS/metal) ensures well-steered collections of photo-generated electrons at the exposed ZnS nanorod stem and metal nanoparticles while holes at the CdS node sheaths, leading to substantially improved photocatalytic hydrogen-evolution performance. Three in one: A unique 1D ternary hetero-nanorod (ZnS) with segmented node sheaths (CdS) decorated by metal nanoparticles (Au) is constructed by a sequential chemical-transformation strategy. The arrangement enables steered charge flow for electron-hole separation and hence efficient photocatalysis.
Controlled synthesis of AgInS2 nanocrystals and their application in organic-inorganic hybrid photodetectors
Deng, Manjiao,Shen, Shuling,Wang, Xuewen,Zhang, Yejun,Xu, Huarui,Zhang, Ting,Wang, Qiangbin
, p. 6443 - 6447 (2013)
High quality AgInS2 nanocrystals (NCs) are synthesized using a simple single-source precursor method, in which the size and morphology of the products can be precisely controlled from heliotrope seed-like NCs of 6 × 12 nm to heliotrope seed-like dimer NCs of 8 × 16 nm by tuning the composition of the coordinating solvents of oleic acid and 1-dodecanethiol. The results show that 1-dodecanethiol plays a dominant role in determining the morphology of AgInS2 NCs due to its strong absorption onto the {001} crystal plane of AgInS2 NCs. The photoelectric properties of the as-prepared AgInS2 NCs have been characterized using AgInS 2-poly(3-hexylthiophene) hybrid nanodevices. The results illustrate that the AgInS2 NCs present very high photosensitivity and photostability to outside illumination. The high sensitivity and stability of the hybrid nanodevice indicate a broad spectrum of applications in the photoelectric nanodevices.
Isomorphous substitution synthesis and photoelectric properties of spinel AgInSnS4 nanosheets
Bian, Qinghuan,Lei, Shuijin,Zhao, Kehan,Tu, Qunying,Zhao, Liang,Rao, Lihui,Xiao, Yanhe,Cheng, Baochang
, p. 9713 - 9720 (2020)
Multinary metal chalcogenides, a remarkable class of materials for designing multifunctionality, possess a broad variety of physical and chemical properties and hold a great promise for a wide range of potential applications. As a typical quaternary I?III?IV?VI4 group semiconductor, spinel AgInSnS4 has only received extremely limited attention probably due to difficulty in synthesis. In this work, for the first time, AgInSnS4 nanocrystals have been successfully fabricated via a simple isomorphous substitution approach using spinel indium sulfide as the parent material. The prepared AgInSnS4 nanosheets perfectly maintain the cubic spinel structure. The optical absorption results show that the obtained spinel AgInSnS4 nanocrystals exhibit strong absorption in the visible-light region and have a direct band gap of about 1.54 eV. The band structure analysis indicates that the AgInSnS4 product should display p-type conduction. Photocurrent measurements reveal that the spin-coated thin film of AgInSnS4 nanosheets can exhibit a broad, sensitive, fast, and stable photoelectric response. The favorable optical and photocurrent properties suggest a significant potential of the prepared spinel AgInSnS4 nanocrystals for applications in photovoltaics and other optoelectronic devices.
Colloidal synthesis and photocatalytic properties of orthorhombic AgGaS2 nanocrystals
Fan, Cong-Min,Regulacio, Michelle D.,Ye, Chen,Lim, Suo Hon,Zheng, Yuangang,Xu, Qing-Hua,Xu, An-Wu,Han, Ming-Yong
, p. 7128 - 7131 (2014)
AgGaS2 (AGS) nanocrystals that exist in the orthorhombic phase were successfully prepared for the first time through a one-pot colloidal synthetic strategy using suitable coordinating solvents. These orthorhombic AGS nanocrystals were found to display great potential in visible-light-driven photocatalysis.
Simple and mixed ligand complexes of Ag(I) involving substituted dithiocarbamic acids, triphenylphosphine and the chelating phosphine diphos - A synthetic and spectrophotometric study
Venkatachalam,Ramalingan
, p. 1125 - 1133 (1996)
Silver(I), being a soft acid shows a preference for P and S containing ligands. In the present study, simple and mixed ligand complexes of Ag(I) involving mono-and diethanoldithiocarbamates, Ag(MEADTC) and Ag(DEADTC), with triphenylphosphine and 1,2-bis(diphenylphosphino)ethane (diphos) were synthesized. For a comparison, Ag(DEDTC), the diethyl analogue, was also synthesized and the properties studied with IR, UV-visible, TG, DT techniques. The mixed ligand complexes involving PPh3 and diphos viz., Ag(DEDTC)(PPh3)2, Ag(DEDTC)(diphos), Ag(DEADTC)(PPh3)2 and Ag(DEADTC)(diphos) (DEDTC- = diethyldithiocarbamate anion, DEADTC- = diethanoldithiocarbamate anion) showed very low conductivity indicating non-ionic character and ruled out possible ion pair formation such as [(PPh3)2Ag]+DEDTC- or [(diphos)Ag]+DEDTC- proposed earlier. In addition, the isolated Ag(MEADTC) complex was found to be highly unstable and, hence, an equilibrium study was made and the stability constant was determined to be 6.1 ± 0.2 by the Harvey and Manning method.
Integration of semiconducting sulfides for full-spectrum solar energy absorption and efficient charge separation
Zhuang, Tao-Tao,Liu, Yan,Li, Yi,Zhao, Yuan,Wu, Liang,Jiang, Jun,Yu, Shu-Hong
, p. 6396 - 6400 (2016)
The full harvest of solar energy by semiconductors requires a material that simultaneously absorbs across the whole solar spectrum and collects photogenerated electrons and holes separately. The stepwise integration of three semiconducting sulfides, namely ZnS, CdS, and Cu2-xS, into a single nanocrystal, led to a unique ternary multi-node sheath ZnS-CdS-Cu2-xS heteronanorod for full-spectrum solar energy absorption. Localized surface plasmon resonance (LSPR) in the nonstoichiometric copper sulfide nanostructures enables effective NIR absorption. More significantly, the construction of pn heterojunctions between Cu2-xS and CdS leads to staggered gaps, as confirmed by first-principles simulations. This band alignment causes effective electron-hole separation in the ternary system and hence enables efficient solar energy conversion. Three semiconducting sulfides, namely ZnS, CdS, and Cu2-xS, were combined to obtain ternary ZnS-CdS-Cu2-xS heteronanorods. The pn heterojunctions between Cu2-xS and CdS induce staggered gaps, as confirmed by first-principles simulations. This band alignment leads to effective electron-hole separation in this ternary system and hence enables efficient solar energy conversion.
A Trialkylphosphine-driven chemical transformation route to Ag- and Bi-based chalcogenides
Han, Shi-Kui,Gu, Chao,Gong, Ming,Yu, Shu-Hong
, p. 5390 - 5396 (2015)
From the standpoint of chemistry, the metastable nature of nanocrystals provides us plentiful ground for the research of new nanoscale structural transformations. Herein, we report a new phenomenon that trialkylphosphine (TAP) can extract the Ag+ and Bi3+ from their nanostructural chalcogenides and reduce them to the zerovalent state. Based on this principle, a trialkylphosphine-driven chemical transformation route has been developed for the synthesis of a series of metals and metal-sulfide heterostructures with multiple sulfides as the precursors. Using this reaction principle, Ag, Bi, Ag-Ni3S2, Ag-ZnS, Ag-AgInS2, Ag-Bi, and Bi-Cu7S4 nanostructures can be successively synthesized. These Ag- or Bi-based metal chalcogenide heteronanostructures with interesting optical properties or multifunctionalities could be of special interest for a variety of applications, including high-performance catalysis, biological and biomedical sensing, photovoltaic devices, and a new generation of optoelectronic devices.
Luminescent Quaternary Ag(InxGa1- x)S2/GaSyCore/Shell Quantum Dots Prepared Using Dithiocarbamate Compounds and Photoluminescence Recovery via Post Treatment
Hoisang, Watcharaporn,Kuwabata, Susumu,Torimoto, Tsukasa,Uematsu, Taro
supporting information, p. 13101 - 13109 (2021/09/11)
Cadmium-free quantum dots (QDs) consisting of silver-indium-gallium-sulfide (AIGS) quaternary semiconductors were successfully synthesized using a metal-dithiocarbamate complex with sufficiently high reactivity to produce metal sulfides. The introduction of a gallium diethyldithiocarbamate precursor decreased the reaction temperature to produce active intermediates, which were subsequently converted into AIGS QDs at 150 °C with silver and indium acetates. Because of the low reaction temperature, AIGS QDs with a tetragonal crystal phase were produced selectively, which favorably generated band-edge emission whose full width at half-maximum is smaller than 40 nm after they were coated with gallium sulfide (GaSy) shells. The compositional indium/gallium ratio was varied by changing the mixing ratio of the precursors used for the synthesis of the AIGS core, and the band-edge photoluminescence (PL) generated from the AIGS/GaSy core/shell QDs was blue-shifted with an increase in the gallium content in the core. Consequently, a pure green emission centered at 518 nm was obtained with a PL quantum yield as high as 68%.
Perfluoroalkyl(dithiocarbamato) tellurium(ii) compounds
Tyrra, Wieland,Naumann, Dieter,Buslei, Sigrid,Kremer, Silke,Pantenburg, Ingo,Scherer, Harald
, p. 1829 - 1837 (2008/02/09)
[NMe4][RfTe(SC(S)NR2)2] derivatives are selectively formed by the oxidation of [NMe4]TeR f (Rf = CF3, C2F5) with [R2NC(S)S]2 (NR2 = NEt2, NBz 2, N(CH2)4) in almost quantitative yields. An alternative route to obtain the dithiocarbamato complex anions offer reactions of Te[SC(S)NR2]2 (NR2 = NEt2, NBz2) with equimolar amounts of Me3SiRf and [NMe4]F. Some of the derivatives were recrystallized with bulky cations in order to determine the crystal structures. Structural elucidation by diffraction methods exhibit the structural feature of a distorted pentagonal planar environment (resembling "butterflies") around the tellurium centres. The carbamato tellurates can be transferred easily into the neutral derivatives, RfTeSC(S)NR2, upon treatment with Ag[BF 4]. In solution they equilibrate with Te2(R f)2 and [R2NC(S)S]2 and finally are transformed into Te(Rf)2, Te[SC(S)NR2] 2, and Te[SC(S)NR2]4, respectively. All compounds are fully characterized by NMR spectroscopic methods (1H, 13C, 19F, 125Te). Additionally, synthesis and characterization of the hitherto unknown derivative [NMe4]TeC 2F5 are described. The Royal Society of Chemistry.
Synthesis, crystal structures, magnetic properties and photoconductivity of C60 and C70 complexes with metal dialkyldithiocarbamates M(R2dtc)x, where M = CuII, CuI, AgI, ZnII, CdII, HgII, Mn II, NiII, and PtII; R = Me, Et, and nPr
Konarev, Dmitri V.,Kovalevsky, Andrey Y.,Khasanov, Salavat S.,Saito, Gunzi,Lopatin, Dmitri V.,Umrikhin, Alexey V.,Otsuka, Akihiro,Lyubovskaya, Rimma N.
, p. 1881 - 1895 (2007/10/03)
New complexes of fullerenes C60 and C70 with metal dialkyldithiocarbamates, [M(R2dtc)x]·[C 60(70)]·[Solvent], R = Et [M = CuII (C60, 1; C70, 2), CuI (C60, 3; C70, 4), AgI (C60, 5), ZnII (C 60, 6), CdII (C60, 7; C70, 8), HgII (C60, 9), MnII (C70, 10)], R = Et and Me [M = CuII (C60, 11), and ZnII (C 60, 12)], and R = nPr [M = CuII (C60, 13), NiII (C60, 14), and PtII (C60, 15)] were obtained. M(R2dtc)x efficiently cocrystallized with fullerene molecules as tetrahedral monomers (6, 12), dimers (1, 7, 11), and tetramers (3, 4). Fullerene molecules form closely packed hexagonal and square layers in 1, 7, and 11, hexagonal and tetragonal 3D structures in 6 and 12, and island motifs in 3 and 4. Complexes 1-15 have a neutral ground state. However, the formation of the complexes with fullerenes changes the environment of paramagnetic CuII and MnII. The EPR spectra of 1, 2, 11, and 13 are essentially modified relative to those of pristine Cu(R 2dtc)2 because of a weak coordination of CuII to fullerene and a flattening of the central (NCS2)2Cu fragments. Complex 10 shows a spectrum exhibiting features from 50 to 600 mT and manifests strong antiferromagnetic coupling of spins with a Weiss temperature of -96 K and the maximum of magnetic susceptibility at 46 K. Such magnetic behavior can be explained by the formation of [Mn(Et2dtc) 2]2 dimers in 10. The illumination of the crystals of 1, 2, and 7 by white light results in up to a 103 increase in photocurrent. The photoconductivity spectra have maxima at 470, 450-650, and 660 nm for 1, 2, and 7, respectively. Photogeneration of free charge carriers is realized by photoexcitation of Cu(Et2dtc)2 in 1 and 2, and by charge transfer from Cd(Et2dtc)2 to C60 molecules in 7. The decrease of photocurrent in 1 and 7 in a weak magnetic field with B0 0.5 T was found. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
