tailieunhanh - báo cáo hóa học: " Photo-catalytic activity of Zn1-xMnxS nanocrystals synthesized by wet chemical technique"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Photo-catalytic activity of Zn1-xMnxS nanocrystals synthesized by wet chemical technique | Chitkara et al. Nanoscale Research Letters 2011 6 438 http content 6 1 438 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Photo-catalytic activity of Zn1-xMnxS nanocrystals synthesized by wet chemical technique Mansi Chitkara1 Karamjit Singh2 Inderjeet Singh Sandhu1 and Harbhajan Singh Bhatti2 Abstract Polyvinyl pyrrolidone capped Zn1-xMnxS 0 x nanocrystals have been synthesized using wet chemical coprecipitation method. Crystallographic and morphological characterization of the synthesized materials have been done using X-ray diffraction and transmission electron microscope. Crystallographic studies show the zinc blende crystals having average crystallite size approx. 3 nm which is almost similar to the average particle size calculated from electron micrographs. Atomic absorption spectrometer has been used for qualitative and quantitative analysis of synthesized nanomaterials. Photo-catalytic activity has been studied using methylene blue dye as a test contaminant. Energy resolved luminescence spectra have been recorded for the detailed description of radiative and non-radiative recombination mechanisms. Photo-catalytic activity dependence on dopant concentration and luminescence quantum yield has been studied in detail. Introduction Environmental pollution toxic water pollutants and industrialization on a global scale have drawn attention for sustained fundamental and applied research in the area of environmental remediation. The increased public concern with environmental pollutants has prompted the need to develop novel treatment methods 1 where photo-catalysis is gaining a lot of attention in the field of pollutant degradation. Semiconductor photo-catalysts offer the potential for complete elimination of toxic chemicals through their efficiency and potentially broad applicability 2 3 . Recently semiconductor nanocrystals have attracted great attention due to their size tunable physical and chemical .