In this paper,CuAlS_(2)nanoparticles are prepared by colloidal route,and the precipitant method is used during the sample purification process.The selected precipitants are methanol plus acetone and methanol plus etha...In this paper,CuAlS_(2)nanoparticles are prepared by colloidal route,and the precipitant method is used during the sample purification process.The selected precipitants are methanol plus acetone and methanol plus ethanol,in which the steps of the precipitation process are exactly the same.The experimental results reveal that the morphology and luminescence characteristics of the samples change significantly after treatment with different precipitants:after precipitating the samples with methanol first,then acetone,the samples are in the form of nano-flakes,and the excitation spectrum is characterized by the presence of an excitation peak at around_(2)75 nm.and the PL spectral measurements indicate that the luminescence peak is located near 407 nm,and its Stokes shift is about 1.47 eV;while,after treating the samples with methanol first,then ethanol,the samples are in the form of nanorods,the excitation spectra show two excitation peaks around_(2)78 nm and_(2)83 nm,and the main peak of luminescence has a blue shift of about 100 nm compared to the acetone-treated sample,with a Stokes shift of 0.435 eV,such a distinction may be due to the difference in polarity between ethanol and acetone.This study reveals that the precipitating agent has an important influence on the properties of the samples treated,which is very instructive for nanomaterial purification studies and related experimental teaching explorations.展开更多
文摘In this paper,CuAlS_(2)nanoparticles are prepared by colloidal route,and the precipitant method is used during the sample purification process.The selected precipitants are methanol plus acetone and methanol plus ethanol,in which the steps of the precipitation process are exactly the same.The experimental results reveal that the morphology and luminescence characteristics of the samples change significantly after treatment with different precipitants:after precipitating the samples with methanol first,then acetone,the samples are in the form of nano-flakes,and the excitation spectrum is characterized by the presence of an excitation peak at around_(2)75 nm.and the PL spectral measurements indicate that the luminescence peak is located near 407 nm,and its Stokes shift is about 1.47 eV;while,after treating the samples with methanol first,then ethanol,the samples are in the form of nanorods,the excitation spectra show two excitation peaks around_(2)78 nm and_(2)83 nm,and the main peak of luminescence has a blue shift of about 100 nm compared to the acetone-treated sample,with a Stokes shift of 0.435 eV,such a distinction may be due to the difference in polarity between ethanol and acetone.This study reveals that the precipitating agent has an important influence on the properties of the samples treated,which is very instructive for nanomaterial purification studies and related experimental teaching explorations.
