Use of Single-Layer g-C(3)N(4)/Ag Hybrids for Surface-Enhanced Raman Scattering (SERS).
Use of Single-Layer g-C(3)N(4)/Ag Hybrids for Surface-Enhanced Raman Scattering (SERS).
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使用单层 g-C3N4/Ag 杂化物进行表面增强拉曼散射 (SERS)
DOI：
10.1038/srep34599
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发表时间：
2016-09-30
影响因子：
4.6
通讯作者：
Zhang W
中科院分区：
文献类型：
--
作者：
Jiang J;Zou J;Wee AT;Zhang W
具有高活性和高稳定性的表面增强拉曼散射（Sers）基底是Sers传感所期望的。在这里，我们报告了一种新的单原子层石墨-C3 N4（S-g-C3 N4）和Ag纳米颗粒（NPs）混合作为高性能Sers基底。采用实验和理论计算相结合的方法，系统研究了高稳定性S-g-C3 N4/Ag基底的表面增强拉曼散射（Sers）机理。XPS和拉曼光谱分析结果表明，S-g-C3 N4与Ag纳米粒子之间存在较强的相互作用，有利于Ag纳米粒子均匀分布在S-g-C3 N4纳米片的边缘和表面，并诱导S-g-C3 N4通过银表面向氧化剂转移电荷，最终保护Ag纳米粒子不被氧化。通过理论计算，我们发现S-g-C3 N4/Ag基底上Ag原子的表面净电荷为正，Ag纳米颗粒呈现出高的介电常数，表明S-g-C3 N4/Ag基底上的Ag原子不易被氧化，从而保证了S-g-C3 N4/Ag基底的高稳定性。对该体系稳定性机制的理解有助于开发其他具有长期稳定性的有效Sers基底。
Surface-enhanced Raman scattering (SERS) substrates with high activity and stability are desirable for SERS sensing. Here, we report a new single atomic layer graphitic-C3N4 (S-g-C3N4) and Ag nanoparticles (NPs) hybrid as high-performance SERS substrates. The SERS mechanism of the highly stable S-g-C3N4/Ag substrates was systematically investigated by a combination of experiments and theoretical calculations. From the results of XPS and Raman spectroscopies, it was found that there was a strong interaction between S-g-C3N4 and Ag NPs, which facilitates the uniform distribution of Ag NPs over the edges and surfaces of S-g-C3N4 nanosheets, and induces a charge transfer from S-g-C3N4 to the oxidizing agent through the silver surface, ultimately protecting Ag NPs from oxidation. Based on the theoretical calculations, we found that the net surface charge of the Ag atoms on the S-g-C3N4/Ag substrates was positive and the Ag NPs presented high dispersibility, suggesting that the Ag atoms on the S-g-C3N4/Ag substrates were not likely to be oxidized, thereby ensuring the high stability of the S-g-C3N4/Ag substrate. An understanding of the stability mechanism in this system can be helpful for developing other effective SERS substrates with long-term stability.
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