Catalytic Growth of Large-Scale Single-Crystal CdS Nanowires by Physical Evaporation and Their Photoluminescence

Abstract

Large-scale CdS nanowires were achieved by a new, simple, and low cost process based on thermal evaporation of CdS powders under controlled conditions with the presence of Au catalyst. The synthesized CdS nanowires have lengths up to several tens of micrometers and diameters about 60−80 nm. The growth of CdS nanowires is controlled by the conventional vapor−liquid−solid (VLS) mechanism. A strong red emission with a maximum around 750 nm was observed from the synthesized CdS nanowires at room temperature, which was attributed to their surface states. The technique we used is, in principle, generalizable as a means of fabricating other group II−VI semiconductor nanowires.

Novel Selective Sensors Based on TiO2 Nanotubes Supported MS(TiO2@MS, M=Cd, Zn) for Their Gas Sensing Properties

“…4a) shows a sharp emission peak with a maximum around 435 nm, which can be attributed to the emission from the excitonic state near the absorption edge of the particles. Meanwhile, the absence of emission from stokesshifted trap states suggests the stoichiometric nature of CdS nanoparticles, without a surface excess of Cd 2+ or S 2-vacancies [20]. On the other hand, since the conduction band of TiO 2 lies more positive than that of the CdS conduction band, electron injection is expected from the photoexcited CdS quantum dots (QDs) into the TiO 2 conduction band.…”

Electrodeposition of Pd–Ag alloy nanowires on highly oriented pyrolytic graphite

“…There are therefore advantages to fabricate Pd-Ag alloy nanowires in comparison with pure Pd nanowires for the application in hydrogen sensors. Considerable efforts have been made on the synthesis of nanowires with different compositions using physical evaporation [8], template (AAO or AAM template and surface template) [5,6,[9][10][11][12][13][14][15][16] and other methods [17,18]. The successful synthesis of Pd-Ag alloy nanowires has not been reported up till now.…”

A General Atmospheric Pressure Chemical Vapor Deposition Synthesis and Crystallographic Study of Transition‐Metal Sulfide One‐Dimensional Nanostructures

“…In the aspect of gas-phase synthesis, a laser-assisted catalytic growth (LCG) method [18±20] was reported to produce many semiconductor nanowires. Illumined and stimulated by the synthesis of oxide nanobelts, [21] thermal evaporation methods have also been developed to grow ZnS nanoribbons [22] and CdS nanowires [23] on a large scale. Otherwise, Cu 2 S [24] nanowires were transformed by sulfuration of the oxide intermediate.…”