硅酸盐学报

碳化硅量子点表面物化特性调控及其光学特性

作者：康杰1 宋月鹏1 2 3 朱彦敏1 高东升2 郭晶1 3 许令峰1 KIMHyoungseop3

单位：1. 山东农业大学机械与电子工程学院山东省园艺机械与装备重点实验室山东泰安 271018 2. 山东农业大学园艺科学与工程学院山东泰安 271018 3. 浦项工科大学材料科学与工程学院韩国浦项 790784

分类号：

出版年,卷(期):页码：2015,43(4):0-0

DOI：

摘要：

采用化学偶联法，通过调整腐蚀剂组分及其相对含量，一步法实现了碳化硅量子点(SiC-QDs)表面物化特性的有效调控。研究表明，经硝酸(HNO3)和氢氟酸(HF)混合腐蚀剂腐蚀纳米β-SiC粉末，通过超声空化破碎分散及高速离心处理，可获得SiC-QDs水相溶液，并一步法实现了表面修饰，在其表面形成了—COO、—OH等亲有机物功能基团。采用浓硫酸(H2SO4)为偶联剂，制备出表面具有巯基(—SH)的SiC-QDs水相溶液。腐蚀剂组分的相对含量对于SiC-QDs的光致发光强度与表面巯基的形成影响较大。在340 nm光波长为激发下，SiC-QDs具有最大的发光强度，随着腐蚀剂中H2SO4含量的增加，其光致发光强度呈现降低趋势。当腐蚀剂的体积比为V(HF):V(HNO3):V(H2SO4)=6:1:1时，制备的水相SiC-QDs表面既能稳定耦合―SH，又可以获得较高的光致发光强度。另外，对表面物化特性调控及其形成机制进行了分析研究。

One-step effective regulation of physicochemical characteristics on the surface of SiC quantum dots (QDs) was obtained by a chemical coupling method via the adjustment of the component and relative content of etchant. The results indicate that the aqueous SiC-QDs are prepared with SiC nanoparticles etched in a mixed chemical etchant of nitric acid (HNO3) and hydrofluoric acid (HF) via ultrasonic cavitation dispersion and high-speed centrifugal treatment. Some hydrophilic organic functional groups, such as carboxyl (―COO), hydroxyl (―OH) and so on, on the surface of SiC-QDs are formed in the process of fabrication. In addition, hydrosulphonyl (―SH) is also prepared via one-step for sulfuric acid (HNO3) as a coupling reagent and the addition of the mixed acid (i.e., HF and HNO3). The component and relative content of mixed-acid etchant can affect the hydrosulphonyl formation and photoluminescence (PL) intensity. The results show that the maximum light intensity of SiC-QDs is emitted at a 340-nm exciting light wavelength, and the PL intensity decreases with increasing the content of H2SO4. The aqueous SiC-QDs surface prepared can be stable and coupled with ―SH, thus obtaining a high photoluminescence strength, when the volume ratio of H2SO4 to HNO3 is 1: 1 (i.e., V(HF):V(HNO3):V(H2SO4)=6:1:1). In addition, the regulation of physicochemical characteristics on the surface of SiC-QDs and the formation mechanism are also analyzed.

基金项目：

基金项目：山东省科技发展计划项目(2014GGB01380)；“十二五”国家支撑计划项目(2011BAD12B02)；山东省博士后创新基金(201203101)；中国博士后科学基金(2013M53163)项目。

作者简介：

第一作者：康杰(1985—)，男，硕士研究生。通信作者：宋月鹏(1971—)，男，博士，副教授。

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