Chiral semiconductor nanorod heterostructures with high photocatalysis activity
Chiral semiconductor nanorod heterostructures with high photocatalysis activity
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具有高光催化活性的手性半导体纳米棒异质结构
DOI：
10.1016/j.apcatb.2019.01.038
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Kuang Hua
中科院分区：
文献类型：
--
作者：
Ma Wei;Mao Jiatian;Hao Changlong;Xu Liguang;Xu Chuanlai;Kuang Hua
手性半导体纳米棒及其异质结构引起了人们的广泛关注。研究表明，手性氨基酸在CdSe@CdS半导体纳米棒（SNR）上呈现圆二色带（CD, 200-480 nm）。发现较长的信噪比诱导更强的CD强度，而信噪比直径的增加导致明显的CD波段红移。铂（Pt）和金（Au）的多位点后生进一步增强了CD强度并诱导了CD带跃迁。电磁计算表明，金属生长后会产生较强的电磁场增强，其中Pt诱导的增强强于Au。优化后的手性多位点铂在信噪比上表现出较高的光催化活性，表明沉积的金属赋予了能量转移，增强了光激发电子与空穴的分离。这些发现表明，多位点沉积金属提供了一种通过调整半导体纳米棒的形貌来产生强光学活性的纳米结构的方法。
Chiral semiconductor nanorods and their heterostructures have attracted intense attention. In this work, it was shown that chiral amino acids on CdSe@CdS semiconductor nanorods (SNR) displayed circular dichroism bands (CD, 200–480 nm). Longer SNRs were found to induce stronger CD intensities, while an increase in the SNR diameter led to a clear CD band redshift. Multi-site post-growth of platinum (Pt) and gold (Au) further enhanced the CD intensity and induced CD band transitions. Electromagnetic calculations revealed that the metal post-growth gave rise to a strong electromagnetic field enhancement, with Pt inducing a stronger enhancement than Au. The optimized chiral multi-sites platinum on SNR displayed higher photocatalytic activities manifested that the deposited metal endowed energy transfer and enhanced the separation of photo-excited electrons and holes. These findings demonstrated that the multi-sites deposited metal provided a method to produce strong optical activity of nanostructures by adjusting the morphology of the semiconductor nanorod.