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Electrical Tuning of MoOx/Ag Hybrids and Investigation of their Surface‐Enhanced Raman Scattering Performance
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-12-12 , DOI: 10.1002/pssr.202000499 Yinghao Xu 1 , Kui Lai 1 , Chenjie Gu 1 , Tao Jiang 1 , Xiang Shen 1 , Shuwen Zeng 2 , Aaron Ho-Pui Ho 3 , Diing Shenp Ang 4 , Jun Zhou 1
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-12-12 , DOI: 10.1002/pssr.202000499 Yinghao Xu 1 , Kui Lai 1 , Chenjie Gu 1 , Tao Jiang 1 , Xiang Shen 1 , Shuwen Zeng 2 , Aaron Ho-Pui Ho 3 , Diing Shenp Ang 4 , Jun Zhou 1
Affiliation
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Surface‐enhanced Raman scattering (SERS) technology is a cutting‐edge analytical tool for molecule detection. Attractive SERS performance has been achieved on noble metal nanostructures; however these substrates usually suffer from difficulties of direct adjusting of the physical structures to achieve tunable SERS performance. Studies on semiconductor oxides have revealed that attractive SERS performance can be obtained on them, but strategies of engineering material properties for SERS performance improvement still pose a challenge. Here, an electrically programmable SERS substrate is prepared by depositing hydrothermally synthesized MoOx/Ag hybrids within electrodes as the SERS active region. In the experiment, an electrical field is applied on the electrodes to regulate Ag+ ion migration and redeposition in the MoOx solid electrolyte. Through adjusting the leakage current level, the size of the Ag nanoparticles in the MoOx/Ag hybrids is electrically controlled. The SERS performance of the substrate is evaluated using rhodamine 6G as the Raman reporter. The results evidence that Raman enhancement factors of 1.13 × 105, 4.75 × 105, and 1.04 × 106 can be obtained by programming the leakage current level to 10−7, 10−5, and 10−3 A, respectively. A maximum detection limit of 10−8 m is achieved on the 10−3 A substrate.
中文翻译：
MoOx / Ag杂化物的电调谐及其表面增强拉曼散射性能的研究
表面增强拉曼散射（SERS）技术是用于分子检测的尖端分析工具。在贵金属纳米结构上已经获得了引人注目的SERS性能。然而，这些基材通常具有直接调节物理结构以实现可调SERS性能的困难。对半导体氧化物的研究表明，可以在它们上获得吸引人的SERS性能，但是提高SERS性能的工程材料性能策略仍然构成挑战。在此，通过在电极内沉积水热合成的MoO x / Ag杂化物作为SERS活性区域来制备电可编程SERS基板。在实验中，在电极上施加电场以调节Ag +MoO x固体电解质中的离子迁移和再沉积。通过调节泄漏电流水平，可以电控制MoO x / Ag杂化物中的Ag纳米粒子的尺寸。使用罗丹明6G作为拉曼报道分子评估底物的SERS性能。结果的证据表明，1.13×10拉曼增强因子5，4.75×10 5，和1.04×10 6，可以通过编程的漏电流电平到10获得-7，10 -5和10 -3 分别为A，。在10 -3 A基板上可达到10 -8 m的最大检测极限。
更新日期：2021-02-09
中文翻译：
MoOx / Ag杂化物的电调谐及其表面增强拉曼散射性能的研究
表面增强拉曼散射（SERS）技术是用于分子检测的尖端分析工具。在贵金属纳米结构上已经获得了引人注目的SERS性能。然而，这些基材通常具有直接调节物理结构以实现可调SERS性能的困难。对半导体氧化物的研究表明，可以在它们上获得吸引人的SERS性能，但是提高SERS性能的工程材料性能策略仍然构成挑战。在此，通过在电极内沉积水热合成的MoO x / Ag杂化物作为SERS活性区域来制备电可编程SERS基板。在实验中，在电极上施加电场以调节Ag +MoO x固体电解质中的离子迁移和再沉积。通过调节泄漏电流水平，可以电控制MoO x / Ag杂化物中的Ag纳米粒子的尺寸。使用罗丹明6G作为拉曼报道分子评估底物的SERS性能。结果的证据表明，1.13×10拉曼增强因子5，4.75×10 5，和1.04×10 6，可以通过编程的漏电流电平到10获得-7，10 -5和10 -3 分别为A，。在10 -3 A基板上可达到10 -8 m的最大检测极限。
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