A simple hydrothermal route for synthesizing SnO<sub>2</sub> quantum dots
Zhu, Hongliang; Yang, Deren; Yu, Guixia; Zhang, Hui; Yao, Kuihong; Zhu, Hongliang; Center of Materials Engineering, Zhejiang Sci-Tech University, Xiasha University Town, Hangzhou 310018, People’s Republic of China ; State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China ;; Yang, Deren; State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China; Yu, Guixia; Center of Materials Engineering, Zhejiang Sci-Tech University, Xiasha University Town, Hangzhou 310018, People’s Republic of China; Zhang, Hui; State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China; Yao, Kuihong; Center of Materials Engineering, Zhejiang Sci-Tech University, Xiasha University Town, Hangzhou 310018, People’s Republic of China
Журнал:
Nanotechnology
Дата:
2006-05-14
Аннотация:
A simple hydrothermal process is proposed for synthesizing SnO<sub>2</sub> quantum dots (QDs), in which hydrazine hydrate is used as the mineralizer instead of NaOH. X-ray diffraction, high-resolution transmission electron microscopy (HRTEM) and UV–vis diffuse reflectance spectroscopy (DRS) were employed to characterize the product. The HRTEM image shows that the diameters of the SnO<sub>2</sub> nanoparticles fall into a small range of 2.3–3.1 nm, with the majority being less than the exciton Bohr radius of SnO<sub>2</sub> (∼2.7 nm). Analysis of the DRS spectrum showed the band gap of the SnO<sub>2</sub> QDs to be 3.88 eV, exhibiting a 0.28 eV blue shift from that of the bulk SnO<sub>2</sub> (3.6 eV). The mechanism for hydrothermal synthesis of the SnO<sub>2</sub> QDs using hydrazine hydrate as the mineralizer is discussed.
663.2Кб