微波合成CdS纳米颗粒的光致发光和光催化性能

摘要

Uniform cadmium sulfide (CdS) nanoparticles have been successfully synthesized via microwave irradiation. The red photoluminescence (PL) spectrum of the CdS nanoparticles displays a strong peak at 602nm by using a 300nm excitation wavelength. It is put for ward that efficiency of recycled CdS semiconductor becomes lower due to the deposit of elemental Cd on the CdS surface, which weakens the photocatalytic activity.%本文用微波液相法成功合成分散均匀的纳米CdS颗粒,并采用XRD和TEM技术分别表征产品结构和形貌.作为光致发光(PL)材料,样品在300nm波长激发下,出现波峰位于在602nm的发射光谱.首次提出由于CdS半导体材料表面发生光腐蚀,即Cd2+离子吸收电子后,还原为单质Cd,并沉积在CdS固体表面,从而阻止光催化反应继续进行的新观点.