Qiu Si, Wu Yang, Li Zhen, Shao Mingrui, Tan Jibing, Du Baoqiang, Zhang Chao, Pan Zhongbin, Li Chonghui, Zhao Xiaofei
School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
J Phys Chem Lett. 2024 Oct 24;15(42):10457-10464. doi: 10.1021/acs.jpclett.4c01870. Epub 2024 Oct 11.
Electric field-induced surface-enhanced Raman scattering (E-SERS) substrates have been proven to further enhance the attained Raman intensity. Herein, integrated with plasmonic Ag nanoparticles (Ag NPs), the thermoelectric BiTe plate as an E-SERS substrate decreased the limit of detection by 2 orders of magnitude and increased the SERS signal by >20 times compared to those without electrical field induction. The thermoelectric potential produced by the BiTe plate could modulate the electron density and subsequently change the Fermi level of Ag. This increases the resonant electron transition probability using a broad range of molecules. The plasmon-activated catalytic reactions of the interconversion between -nitrothiophenol and ,'-dimercaptoazobenzene could be controlled through the E-SERS template. On the basis of the finite element method, explicit theoretical analysis indicated that the Ag NP-BiTe-molecule charge transfer could improve our understanding of the SERS and photocatalytic mechanism.
电场诱导表面增强拉曼散射（E-SERS）基底已被证明能进一步增强所获得的拉曼强度。在此，与等离子体银纳米颗粒（Ag NPs）集成的热电BiTe板作为E-SERS基底，与无电场诱导的情况相比，检测限降低了2个数量级，SERS信号增强了20倍以上。BiTe板产生的热电势可调节电子密度，进而改变Ag的费米能级。这增加了使用多种分子的共振电子跃迁概率。通过E-SERS模板可以控制对硝基硫酚和4,4'-二巯基偶氮苯之间相互转化的等离子体激活催化反应。基于有限元方法的明确理论分析表明，Ag NP-BiTe-分子电荷转移有助于我们更好地理解SERS和光催化机制。
