Abstract
Plasmon-driven selective oxidation reaction of p-aminothiophenol (PATP) to p,p′-dimercaptoazobenzene (DMAB) can be realized in a local electromagnetic field (hot spot) because of surface plasmon resonance (SPR). To a remarkable extent, the size and movement of the hot spot can be freely controlled, via tip-enhanced Raman scattering (TERS) spectroscopy. In a particular TERS system, the hot spot can move by following the TERS tip, and the PATP molecules located in the trajectory of the TERS tip, but not in other areas, can be transformed into DMAB molecules. Through this feature, we can realize artificially drawn DMAB molecular graphics on a flat surface equably covered by PATP molecules at the micronano scale using TERS. We analyzed the range and effect of the instant hot spot according to the results of simulation using the finite-difference time-domain (FDTD) method for the TERS system and surface-enhanced Raman scattering (SERS) mapping. The selectivity and controllability of catalysis in the TERS system provides a new technique for marking, with this work contributing to the field of nanotechnology by providing a new method to obtain nanoscale patterns.
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