CAJ | 학술논문

采用水溶性前驱物在乙醇介质中制备了不同[S2-]/[Pb2+]摩尔比例的PbS纳米晶,利用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见吸收光谱(Abs)、光致发光谱(PL)对所制备PbS纳米晶的晶体结构、纳米晶粒径、形貌以及能带结构和发光特性进行了表征,结果表明:随着前驱物[S2-]/[Pb2+]摩尔比例的提高,PbS纳米晶颗粒尺寸从3.9 nm增大到5.9 nm,发光峰值位置从1009 nm移动到1486 nm.通过拟合[S2-]/[Pb2+]=0.5条件下PbS纳米晶平均粒径对时间变化曲线,发现该方法下PbS纳米晶所经历的生长机制为Ostwald成熟化.运用经典纳米晶扩散控制生长模型,解释了实验中随着[S2-]/[Pb2+]的提高对溶液中纳米晶生长速率的影响.
채용수용성전구물재을순개질중제비료불동[S2-]/[Pb2+]마이비례적PbS납미정,이용X사선연사(XRD)、투사전자현미경(TEM)、자외-가견흡수광보(Abs)、광치발광보(PL)대소제비PbS납미정적정체결구、납미정립경、형모이급능대결구화발광특성진행료표정,결과표명:수착전구물[S2-]/[Pb2+]마이비례적제고,PbS납미정과립척촌종3.9 nm증대도5.9 nm,발광봉치위치종1009 nm이동도1486 nm.통과의합[S2-]/[Pb2+]=0.5조건하PbS납미정평균립경대시간변화곡선,발현해방법하PbS납미정소경력적생장궤제위Ostwald성숙화.운용경전납미정확산공제생장모형,해석료실험중수착[S2-]/[Pb2+]적제고대용액중납미정생장속솔적영향.
PbS nanocrystals with different precursor molar of [S2-]/[Pb2+] were prepared in alcohols medium from water-solubility precursors. The crystal structure, average particle size, morphology and luminescence properties of as-synthesized products were characterized by X-ray diffraction (XRD) spectra, transmission electron microscope (TEM) images, ultraviolet-visible (UV-VIS) absorption spectra and photoluminescence (PL) spectra. The XRD patterns show that the average particle size of the samples is calculated to be increased from 3.9 nm to 5.9 nm with the [S2-]/[Pb2+] molar ratio enhanced. The PL emission peak position is red-shifted from 1 009 nm to 1 486 nm. The influence of different [S2-]/[Pb2+] molar ratios on growth rate of PbS nanocrystals was discussed and the growth mechanism was thought to be the diffusion-controlled growth model via Ostwald ripening.