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RISS 인기검색어
- 검색키워드
- 저자 : Huaibin Shen (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Synthesis of CdS, ZnS, and CdS/ZnS Core/Shell Nanocrystals Using Dodecanethiol
Jinzhong Niu,Weiwei Xu,Huaibin Shen,Sen Li,Hongzhe Wang,Lin Song Li 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.2
We report a new route to synthesize high quality zinc blende CdS and ZnS nanocrystals in noncoordinating solvent 1-octadecene, using dodecanethiol (DDT) molecules as both the sulfur source and surface capping ligands. Different reaction temperatures and Cd(Zn)/DDT molar ratios were tested to optimize the synthesis conditions. Absorption photoluminescence (PL) spectroscopy, Fourier transform infrared (FTIR) spectroscopy,X-ray diffraction (XRD) pattern, and transmission electron microscopy (TEM) were used to characterize assynthesized nanocrystals. The narrow half width at the half-maximum on the long wavelength side of the firstexcitonic absorption peak and TEM images demonstrated nearly monodisperse size distributions of asprepared CdS, ZnS, and CdS/ZnS core/shell nanocrystals. Only trap emissions of the nanocrystals were detected when the amount of DDT was excessive, this came from the strong quenching effect of thiol groups on the nanocrystal surfaces. After overcoating with ZnS shells, band-gap emissions of CdS nanocrystals were partially recovered.
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Synthesis of CdS, ZnS, and CdS/ZnS Core/Shell Nanocrystals Using Dodecanethiol
Niu, Jinzhong,Xu, Weiwei,Shen, Huaibin,Li, Sen,Wang, Hongzhe,Li, Lin Song Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.2
We report a new route to synthesize high quality zinc blende CdS and ZnS nanocrystals in noncoordinating solvent 1-octadecene, using dodecanethiol (DDT) molecules as both the sulfur source and surface capping ligands. Different reaction temperatures and Cd(Zn)/DDT molar ratios were tested to optimize the synthesis conditions. Absorption photoluminescence (PL) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) pattern, and transmission electron microscopy (TEM) were used to characterize assynthesized nanocrystals. The narrow half width at the half-maximum on the long wavelength side of the firstexcitonic absorption peak and TEM images demonstrated nearly monodisperse size distributions of asprepared CdS, ZnS, and CdS/ZnS core/shell nanocrystals. Only trap emissions of the nanocrystals were detected when the amount of DDT was excessive, this came from the strong quenching effect of thiol groups on the nanocrystal surfaces. After overcoating with ZnS shells, band-gap emissions of CdS nanocrystals were partially recovered.
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Synthesis of CdS Nanocrystals with Different Shapes via a Colloidal Method
Bai, Jie,Liu, Changsong,Niu, Jinzhong,Wang, Hongzhe,Xu, Shasha,Shen, Huaibin,Li, Lin Song Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
Size- and shape-controlled monodisperse wurtzite structured CdS nanorods have been successfully synthesized using a facile solution-based colloidal method. Depending on the control of injection/growth temperatures and the variation of Cd-to-S molar ratios, the morphology of the CdS nanocrystals (NCs) can be adjusted into bullet-like, rod-like, and dot-like shapes. X-ray diffraction (XRD), transition electron microscopy (TEM), and absorption spectroscopy were used to characterize the structure, morphology, and optical properties of as-synthesized CdS NCs. It was found that uniform CdS nanorods could be successfully synthesized when the injection and growth temperatures were very high (> $360^{\circ}C$). The aspect ratios of different shaped (bullet-like or rod-like) CdS NCs could be controlled by simply adjusting the molar ratios between Cd and S.
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Sheng Wang,Yanbing Lv,Ruili Wu,Lin Song Li,Huaibin Shen,Ming Xing,Xia Chen 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.7
The high-quality green-emitting CdS0 . 5Se0 .5/8Zn1 − x Cd x S/2ZnS QDs with “8” and “2” monolayers (ML) of corresponding shell were first synthesized by “thermal-cycling coupled single precursor” (TC-SP) approach. The component-gradient Zn1− x Cd x S interlayer played a key role in the growth of thick shell by gradually buffering the large lattice mismatch (~9%) between the CdS0 . 5Se0 .5 core and ZnS shell. Moreover, the Zn1− x Cd x S gradient interlayer as well as ZnS outshell increased the potential barrier to prevent excitons from being trapped by surface defects. The photoluminescence quantum yields of the as-synthesized CdS0 . 5Se0 .5/8Zn1 − x Cd x S/2ZnS core/shell QDs can reach to 70% in organic media and still maintain 60% after aqueous phase transfer. The green-emitting CdS0 . 5Se0 .5/8Zn1 − x Cd x S/2ZnS core/shell QDs may be good candidates for applications of biomedical and photoelectric field.
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Synthesis of CdS Nanocrystals with Different Shapes via a Colloidal Method
Jie Bai,Changsong Liu,Jinzhong Niu,Hongzhe Wang,Shasha Xu,Huaibin Shen,Lin Song Li 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
Size- and shape-controlled monodisperse wurtzite structured CdS nanorods have been successfully synthesized using a facile solution-based colloidal method. Depending on the control of injection/growth temperatures and the variation of Cd-to-S molar ratios, the morphology of the CdS nanocrystals (NCs) can be adjusted into bullet-like, rod-like, and dot-like shapes. X-ray diffraction (XRD), transition electron microscopy (TEM), and absorption spectroscopy were used to characterize the structure, morphology, and optical properties of assynthesized CdS NCs. It was found that uniform CdS nanorods could be successfully synthesized when the injection and growth temperatures were very high (> 360 °C). The aspect ratios of different shaped (bullet-like or rod-like) CdS NCs could be controlled by simply adjusting the molar ratios between Cd and S.
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