Photoactive Control of Surface-Enhanced Raman Scattering with Reduced Graphene Oxide in Gas Atmosphere
Photoactive Control of Surface-Enhanced Raman Scattering with Reduced Graphene Oxide in Gas Atmosphere
复制标题
气体气氛中还原氧化石墨烯对表面增强拉曼散射的光活性控制
DOI：
10.1021/acsnano.1c07695
复制
发表时间：
2021
期刊：
影响因子：
17.1
通讯作者：
Jiaguang Han
中科院分区：
文献类型：
--
作者：
Lu Zhou;Lauren Pusey-Nazzaro;Guanhua Ren;Ligang Chen;Liyuan Liu;Wentao Zhang;Li Yang;Jun Zhou;Jiaguang Han
表面增强拉曼散射（Sers）是一种用于多种研究领域的高灵敏度检测技术。电磁和化学增强机制通常被认为是同时有助于Sers信号。然而，难以在衬底制造之后主动控制Sers信号的增强，因为调谐前述增强机制中的一个或两个仍然是实验挑战。在这里，我们提出了一种主动实现Sers信号光致调制的方法，即在紫外光照射下，石墨烯的费米能级可以由于气体分子的吸附和脱附而被动态调制。该方法在O2、CO2、N2和空气气氛中进行了验证，并通过不同的分析物证明了其通用性。此外，该方法还成功地应用于空气环境中水果皮上痕量农药的检测，显示了其在传感方面的实用意义。
Surface-enhanced Raman scattering (SERS) is an ultrahigh sensitive detection technique for a variety of research fields. Both electromagnetic and chemical enhancement mechanisms are generally considered to contribute simultaneously to SERS signals. However, it is difficult to actively control the enhancement of SERS signals after the substrate is fabricated, since tuning one or both of the aforementioned enhancement mechanisms remains an experimental challenge. Here, we propose a method for actively implementing the photoinduced modulation of SERS signals, which is that under UV irradiation, the Fermi level of graphene can be dynamically modulated due to the adsorption and desorption of gas molecules. The method is validated in gas atmospheres of O2, CO2, N2, and air and also demonstrate its generality by different analytes. In addition, the method was successfully applied to the trace detection of pesticides on fruit peels in air environment, which show its practical implications in sensing.