http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Xu Hongzhe (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
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.
-
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.
-
Research on Starting Clutch Control Strategy of Unmanned Helicopter
Zhou Yaoming,Zhang Lei,Xu Hongzhe,Wu Zhe 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
A method is explored to realize automatic control of starting clutch. The clutch control requirements are determined based on the dynamics characteristics research of an unmanned helicopter clutch, and the analysis of clutch engagement process effect on transmission impact and belts life. The rotating speed of clutch driving pulley and driven pulley are selected as basic input parameters. The starting clutch engagement control is divided into three stages. The three stages are fast engagement before rotor rotates, slow engagement and fast engagement after synchronization in turn. Subsection algorithm is adopted in fast engagement before rotor rotates. PID algorithm is adopted in slow engagement. The automatic control of starting clutch engagement at various operating conditions is realized in this way. The experimental results indicate that this control strategy can fit the changes of clutch parameters. It is proved that this clutch control strategy has met the autonomous control requirements of unmanned helicopter.
-
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.
-
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.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
