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Controlled Deposition Number of Organic Molecules Using Quartz Crystal Microbalance Evaluated by Scanning Tunneling Microscopy Single-Molecule-Counting
Analytical Chemistry ( IF 7.4 ) Pub Date : 2018-06-27 00:00:00 , DOI: 10.1021/acs.analchem.8b01118
Eiichi Inami 1, 2 , Masataka Yamaguchi 1 , Takayuki Yamaguchi 1 , Mikio Shimasaki 1 , Toyo Kazu Yamada 1, 3
Affiliation  

Precise control of organic molecule deposition on a substrate is quite important for fabricating single-molecule-based devices. In this study, we demonstrate whether a quartz-crystal microbalance (QCM) widely used for a film growth calibration has the ability to precisely measure the number of organic molecules adsorbed on a substrate. The well-known Sauerbrey’s equation is extended to formulate the relation between QCM resonant frequency shift and the number of adsorbed molecules onto the QCM surface. The formula is examined by QCM measurements of sublimation of π-conjugated organic molecules and direct counting of the deposited molecules one by one onto metal substrates, using ultrahigh vacuum low-temperature scanning tunneling microscopy (STM). It is revealed that the number of adsorbed molecules evaluated by QCM (NQCM) show good agreement with those counted from the STM images (NSTM) within the error of ±25%. The results ensure the QCM capability for controlling the deposition number of organic molecules with high accuracy, that is, if one needs to deposit 100 molecules on the substrate, QCM control promises deposition of 100 ± 25 molecules.

中文翻译:

扫描隧道显微镜单分子计数法评估使用石英晶体微量天平控制有机分子的沉积数

对于制造基于单分子的器件而言,精确控制有机分子在基板上的沉积非常重要。在这项研究中,我们证明了广泛用于膜生长校准的石英晶体微量天平(QCM)是否具有精确测量吸附在基材上的有机分子数量的能力。扩展了著名的Sauerbrey方程,以公式化QCM共振频率偏移和QCM表面上吸附的分子数之间的关系。使用超高真空低温扫描隧道显微镜(STM),通过QCM测量π共轭有机分子的升华并直接将沉积的分子逐一计数到金属基质上,从而对分子式进行了检验。结果表明,用QCM估算的吸附分子数(NQCM)与STM图像(N STM)计数的结果吻合良好,误差在±25%以内。结果确保了QCM能够以高精度控制有机分子的沉积数量,也就是说,如果需要在基板上沉积100个分子,则QCM控制有望沉积100±25个分子。
更新日期:2018-06-27
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