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RSC Advances
Page 7 of 9
DOI: 10.1039/C6RA26085C
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Notes and references
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Fig. 9 1H NMR spectra of sample after benzylation under various conditions.
,
To investigate the catalytic activity of GONP, benzylation of
benzene with benzyl chloride (BzCl) has been carried out.32-34
GONP/MCM-41 was used for benzylation at the reaction
temperature of 80 °C, the reaction time of 3 hours and the
benzene to BzCl ratio 10 and the results are shown Fig. 9. The
major product in the reaction is diphenylmethane (DPM). The
trace of the formation of by-product (dibenzylbenzene) was
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be 71% and 51%, respectively. The time of frequency (TOF) of
this catalysis was found to be 25 h-1. On the other hand,
commercial β-Ga2O3 powder did not show formation of DPM
at all. This result revealed that our catalyst was active for the
benzylation of benzene with BzCl, probably due to the
increased surface area of β-Ga2O3.
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Conclusions
We have demonstrated a novel approach to prepare nanosized
β-Ga2O3 particles utilizing GaNP as precursors. A strong
dependence between the structure of GONP and the thermal
annealing temperature was observed. Furthermore, it was
found that silica coating allowed to maintain the spherical
shape of nanoparticles without formation of aggregation and
change of morphology (GO@SiO2 NP). The single-crystalline
GONP with spherical morphology exhibited a light blue
emission and band gap shift derived from quantum size effect
compared to bulk β-Ga2O3. Moreover, MCM-41 supported
GONP
(GONP/MCM-41) revealed catalytic activity for
benzylation of benzene with BzCl. We strongly believe that
GONP will be suitable for applications in LED phosphors,
optoelectronic devices, and supported catalysts.
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Acknowledgements
The authors acknowledge financial support from a JSPS Grant-
in-Aid for Scientific Research (B) (26288054) and a JSPS Grant-
in-Aid for Young Scientists (B) (15K17861). The authors
appreciate Prof. M. Kato and Prof. Y. Wang for XRD
measurements and TEM (environmental cell) for SAED,
respectively. The TEM observation was carried out at the OPEN
FACILITY, Hokkaido University Sousei Hall.
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,
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RSC Adv., 2014, , 2310–2317.
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