نتایج جستجو برای: نانودرات zns

تعداد نتایج: 2976  

Journal: :Nano letters 2010
Rui Chen Dehui Li Bo Liu Zeping Peng Gagik G Gurzadyan Qihua Xiong Handong Sun

A systematic investigation into the excitonic properties of wurtzite ZnS nanowires (NWs) is presented. Under optical excitation, the ZnS NWs exhibit strong ultraviolet (UV) emission. Optical transition from free exciton A, free exciton B, and shallow level emission are observed and analyzed through power-dependent and temperature-dependent photoluminescence spectroscopy measurements performed f...

Journal: :Nanoscale 2014
Jing Wang Yee-Fun Lim Ghim Wei Ho

In this paper, we demonstrate a facile design of ZnS-based heterostructures tailored by versatile glucose-derived carbon ensembles, including carbon dots (CDs) and thin carbon shells, via hydrothermal synthesis. Tuning the content of glucose allows interesting and simple conversion from CDs to carbon shells on the surfaces of ZnS nanospheres. The as-formed ZnS/carbon nanocomposites exhibit an e...

Journal: :Nature materials 2005
Zhongwu Wang Luke L Daemen Yusheng Zhao C S Zha Robert T Downs Xudong Wang Zhong Lin Wang Russell J Hemley

Nanometre-sized inorganic dots, wires and belts have a wide range of electrical and optical properties, and variable mechanical stability and phase-transition mechanisms that show a sensitive dependency on size, shape and structure. The optical properties of the semiconductor ZnS in wurtzite structures are considerably enhanced, but the lack of structural stability limits technological applicat...

2009
Chuanmiao Yan Fangqiong Tang Linlin Li Hongbo Li Xinglu Huang Dong Chen Xianwei Meng Jun Ren

This work described a continuous method to synthesize CdTe/CdS/ZnS core/shell/shell quantum dots. In an integrated system by flawlessly combining the chemical aerosol flow system working at high temperature (200-300 degrees C) to generate CdTe/CdS intermediate products and an additional heat-up setup at relatively low temperature to overcoat the ZnS shells, the CdTe/CdS/ZnS multishell structure...

Journal: :international journal of nano dimension 0
a. pourahmad department of chemistry, guilan science and research branch, islamic azad university, guilan, iran.

we report the growth by ion exchange synthesis of zns nanoparticles in mcm-41 matrices using zn (ch3coo)2 and na2s starting sources. the final product (zns/mcm-41) was characterized by x-ray diffraction (xrd) pattern, transmission electron microscopy (tem), scanning electron microscopy (sem), infrared spectrometry (ir) and uv-vis spectroscopy. its crystalline structure and morphology was studie...

Journal: :Chemical communications 2009
Daocheng Pan Ding Weng Xiaolei Wang Qiangfeng Xiao Wei Chen Chuanlai Xu Zhengzhong Yang Yunfeng Lu

Nearly monodisperse alloyed (CuInS2)x(ZnS)1-x nanocrystals with cubic and hexagonal phases were successfully synthesized for the first time, and the band gaps of these alloyed nanocrystals can be tuned in the broad range of 1.5 to 3.7 eV by changing the ratio of CuInS2 to ZnS.

2006
Myriam Protière Peter Reiss

A new method for the capping of colloidal CdS nanocrystals with ZnS shells is presented. A combination of the monomolecular precursor zinc ethylxanthate (Zn(ex)2) and zinc stearate was used to replace hazardous organometallic reagents usually applied in this procedure, i.e. bis(trimethylsilyl) sulfide and diethylzinc. Its simple preparation, air-stability and low decomposition temperature of 15...

2010
Zai-Xing Yang Wei Zhong Yu Deng Chaktong Au You-Wei Du

Novel core-shell nanostructures comprised of cubic sphalerite and hexagonal wurtzite ZnS have been synthesized at 150°C by a simple hydrothermal method. The results of HR-TEM and SAED investigation reveal that the cores of hexagonal wurtzite ZnS (ca. 200 nm in average diameter) are encapsulated by a shell of cubic sphalerite ZnS. The FE-SEM image of the nanomaterials shows a surface tightly pac...

1997
J. Rodriguez-Viejo K. F. Jensen M. G. Bawendi

We report room-temperature cathodoluminescence and photoluminescence spectra originating from ZnS overcoated CdSe nanocrystals, 33 and 42 Å in diameter, embedded in a ZnS matrix. The thin-film quantum dot composites were synthesized by electrospray organometallic chemical vapor deposition. Cathodoluminescence and photoluminescence are dominated by the sharp band-edge emission characteristic of ...

2011
Shu-quan Chang Bin Kang Yao-dong Dai Hong-xu Zhang Da Chen

Biocompatible chitosan-coated ZnS quantum dots [CS-ZnS QDs] and chitosan-coated ZnS:Mn2+ quantum dots [CS-ZnS:Mn2+ QDs] were successfully fabricated via a convenient one-step γ-radiation route. The as-obtained QDs were around 5 nm in diameter with excellent water-solubility. These QDs emitting strong visible blue or orange light under UV excitation were successfully used as labels for PANC-1 ce...

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