基于原位XAFS的铂纳米晶体的成核生长机理研究.docVIP

基于原位XAFS的铂纳米晶体的成核生长机理研究 张朵1，，1,*，,* 1苏州大学功能纳米与软物质研究院，苏州市工业园区仁爱路199号，215123 2上海光源，中国科学院上海应用物理研究所，浦东新区张衡路239号，201204 *Email: xhsun@suda.edu.cn,; jiangzheng@sinap.ac.cn 理解金属纳米晶的成核生长过程，对于其在实际应用过程的可控合成和性能调控是一个至关重要【1】。 最近，基于同步辐射技术的发展，原位X射线吸收精细结构光谱已经被证明用来作为研究金属纳米晶成核是强有力的工具【2】。在此报告中，我们利用原位XAFS测试手段，采用自制的反应器来研究水溶液中铂纳米晶体的成核生长过程。我们发现，铂纳米晶体的成核生长过程经历两种不同的途径，取决于还原剂（抗坏血酸）加入铂前驱体溶液（氯铂酸）的过程。 Fig. 1 Scheme of the experiment setup employed for in-situ fluorescence XAFS during the formation of Pt NCs Fig.2 Fourier transform of the EXAFS data of nucleation and growth of platinum nanocrystals in different reaction procedures (a) reducing agent (ascorbic acid) is added in the HPtCl4 solution once with excessive amount (b) reducing agent (ascorbic acid) is added in the HPtCl4 solution continuously. 关键词：铂纳米晶体；原位XAFS；成核生长 参考文献 [1] Ma, Y.; Li, W.; Cho, E. C.; Li, Z.; Yu, T.; Zeng, J.; Xie, Z.; Xia, Y., Acs Nano 2010, 4(11): 6725-6734 [2] Yao, T.; Sun, Z.; Li, Y.; Pan, Z.; Wei, H.; Xie, Y.; Nomura, M.; Niwa, Y.; Yan, W.; Wu, Z., J Am Chem Soc 2010, 132 (22),: 7696-7701. Study of nucleation mechanism of Pt nanocrystals based on in-situ XAFS Duo Zhang1, Yanyun Ma 1, Yujiang Xia1, Jun Zhong1, Xuhui Sun1,* Zheng Jiang2,* 1 The Functional Nano Soft Materials Laboratory , Soochow University, 199 Ren-ai Road, Suzhou Industrial Park, Suzhou, 215123,PR China 2Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 210204,PR China To understand the nucleation and growth mechanism of metal nanocrystals is a key issue to rational synthesis and controllable properties in their pratical applications. More recently, based on the development of synchrotron techniques, the in-situ X-ray absorption fine structures (XAFS) spectroscopy has been demonstrated as a powerful tool to study the initial nucleation. In this report, we investigated the nucleation and growth mechanism of Pt nanocrystals in the aqueous solution based on a home-built reactor emplo