文献类型：期刊文献

英文题名：Immobilization of Gold Nanoparticles in Spherical Polymer Brushes Observed by Small-Angle X-ray Scattering

作者：Sun, Liang[1];Han, Haoya[2,3];Liu, Zhiyong[1];Fu, Zhinan[2];Hua, Chen[2];Ma, Enguang[1];Guo, Jiangtao[2];Liu, Jichang[1,2];Li, Li[2];Fang, Bo[2];Guo, Xuhong[1,2]

机构：[1]Shihezi Univ, Engn Res Ctr Mat Chem Engn Xinjiang Bingtuan, Shihezi 832000, Xinjiang, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]BASF Adv Chem Co Ltd, Shanghai 200137, Peoples R China

年份：2022

卷号：38

期号：5

起止页码：1869

外文期刊名：LANGMUIR

收录：;EI(收录号：20220611602651);WOS:【SCI-EXPANDED(收录号:WOS:000763586100023)】；

基金：The authors acknowledge the financial support from the Key Scientific and Technological Project of Xinjiang Bingtuan (2018AB025) and NSFC Grants (51773061 and 51761135128). They also thank the staff from the BL19U2 beamline of the National Facility for Protein Science in Shanghai (NFPS) at the Shanghai Synchrotron Radiation Facility for assistance during data collection.

语种：英文

外文关键词：Gold compounds - Gold nanoparticles - Metal nanoparticles - Dendrimers - Fiber optic sensors

摘要：Nanosized gold nanoparticles (AuNPs) are of great interest in areas such as catalysts or imaging but are easy to aggregate due to high surface activity. To stabilize AuNPs, two approaches were employed to immobilize AuNPs in spherical polymer brushes (SPBs), namely, the in situ preparation of AuNPs within the brush layer of SPBs and external addition of preprepared citrate-capped AuNPs. The distribution and stability of AuNPs in SPBs were studied by small-angle X-ray scattering (SAXS). SAXS results demonstrated that the in situ-prepared AuNPs were mainly located on the inner layer and their amount decreased from inside to outside. In the case of external addition of preprepared AuNPs, the cationic SPB showed obvious immobilization, while almost no AuNPs were immobilized in the anionic SPB. The stable immobilization of the AuNPs in SPBs was the result of multiple interactions including complexation and electrostatic interaction. SAXS was validated to be a distinctive and powerful characterization method to provide theoretical guidance for the stable immobilization of AuNPs.