Zhao Xingyu, Chu Qi, Guo Shuang, Park Eungyeong, Jin Sila, Chen Lei, Liu Yucun, Jung Young Mee
Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, College of Chemistry, Jilin Normal University, Changchun 130103, PR China.
Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea.
Spectrochim Acta A Mol Biomol Spectrosc. 2023 Feb 5;286:121995. doi: 10.1016/j.saa.2022.121995. Epub 2022 Oct 18.
The Ag and MoO layer-by-layer sputtering method was employed to fabricate Ag/MoO coated on a polystyrene (PS) array (Ag/MoO@PS), which exhibited excellent surface-enhanced Raman scattering (SERS) activity. The thickness of the MoO layer was controlled by changing the sputtering power. The SERS intensity of 4-aminothiophenol (PATP) on Ag/MoO@PS with a 2 nm thickness of the MoO layer was comparable to that on pure Ag coated on the PS array (Ag@PS). This is possible because hot electrons were injected from Ag into the MoO layer to enhance the photocatalyst reaction; thus, the SERS spectra of coupled PATP were obtained. The transport of hot electrons rapidly decayed and was blocked with increasing thickness of the MoO layer from 2 nm to 9 nm. Thus, the SERS intensity decreased, and interestingly, the b mode of PATP decreased and nearly disappeared. This study provides new insight into the control of hot electron reduction for catalytic reduction process monitoring.
采用银和氧化钼逐层溅射法在聚苯乙烯（PS）阵列上制备了Ag/MoO涂层（Ag/MoO@PS），其表现出优异的表面增强拉曼散射（SERS）活性。通过改变溅射功率来控制氧化钼层的厚度。氧化钼层厚度为2纳米的Ag/MoO@PS上4-氨基硫酚（PATP）的SERS强度与PS阵列上纯银涂层（Ag@PS）上的相当。这是因为热电子从银注入到氧化钼层中以增强光催化反应；因此，获得了耦合PATP的SERS光谱。随着氧化钼层厚度从2纳米增加到9纳米，热电子的传输迅速衰减并被阻断。因此，SERS强度降低，有趣的是，PATP的b模式降低并几乎消失。该研究为催化还原过程监测中的热电子还原控制提供了新的见解。
