Meng Bin, Xie Yong, Chen Le, Wang Haitao, Li Ming, Dong Zhuxin
Department of Biomedical Engineering, School of Basic Medical Sciences, Central South University, Changsha, Hunan 410013, China.
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
ACS Appl Mater Interfaces. 2023 Apr 5;15(13):16984-16990. doi: 10.1021/acsami.2c22624. Epub 2023 Mar 22.
This paper reports a handy technical scheme to decorate atomic force microscopy (AFM) tips toward tip-enhanced Raman spectroscopy (TERS) applications. The major attraction of these homemade tips lies in that silver decoration can be confined at the apex of commercial tips by the means of an AFM-controlled electrochemical reaction. The reduction of Ag occurs in a highly sealed environment to secure the metal coating efficiency. Key factors include silver nitrate solution to provide Ag, ambient relative humidity and temperature in a humidity cell, electric potential bias, and tip-surface distance. Subsequently, these silver-coated tips are evaluated for TERS measurement of carbon nanotubes (CNTs) so that both morphological and chemical characteristics of CNTs are concurrently obtained. The Raman spectra reveal that our plasmonic tip competently possesses an ∼30-fold local field signal increase and the corresponding TERS image laterally resolves at the single-pixel level.
本文报道了一种用于将原子力显微镜（AFM）探针修饰用于针尖增强拉曼光谱（TERS）应用的简便技术方案。这些自制探针的主要吸引人之处在于，通过AFM控制的电化学反应，银修饰可以被限制在商业探针的尖端。银的还原在高度密封的环境中进行，以确保金属涂层效率。关键因素包括提供银的硝酸银溶液、湿度池中环境相对湿度和温度、电势偏压以及探针-表面距离。随后，对这些涂银探针进行了碳纳米管（CNT）的TERS测量评估，从而同时获得了CNT的形态和化学特征。拉曼光谱表明，我们的等离子体探针能够有效地使局部场信号增强约30倍，并且相应的TERS图像在单像素水平上具有横向分辨率。
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