以巯基丙酸为稳定剂的水溶性CdTe量子点的水热合成及表征

Abstract

Mercaptopropionic acid(MPA) modified high quality CdTe quantum dots(QDs) were prepared by hydrothermal synthesis method in a high temperature.The influences of different reaction time and different pH value of the reactive precursor solution on the optical properties of CdTe QDs were studied.The results indicate that the fluorescence emission wavelength of the as-prepared CdTe QDs can be adjusted continuously at a range of 510~661 nm,and the optical properties of CdTe QDs strongly depend on the pH value of the reactive precursor solution(the optimum pH value is 9).The samples were characterized by transmission electron microscopy and X-ray diffraction.The results show that the shape of the as-prepared CdTe QDs is closed to sphere,and the particle size distribution is uniform.Comparing with the reflux method for preparing water-soluble QDs,the hydrothermal synthesis method at a high temperature is relatively simple,and the reaction time is shorter,the growth of CdTe QDs is faster,the particle size can be grown to 3.5 nm within 100 min.The as-prepared CdTe QDs possess higher fluorescence intensity,good stability and higher fluorescence quantum yield(up to 44.6%).