(Invited) Enhancement of Plasmon-Induced Charge Separation through Plasmon Coupling

Abstract

Plasmon-induced charge separation (PICS)1,2 involves electron transfer from plasmonic noble metal nanoparticles or compound nanoparticles to an n-type semiconductor such as TiO2. Oxidation reactions involved in PICS are based on a charge accumulation mechanism (Figure a) or a hole ejection mechanism (Figure b).3 The latter enables nanoscale local oxidation at relatively positive potentials.4-7 This can be applied to photoinduced nanofabrication beyond the diffraction limit of light. For instance, chiral plasmonic nanostructures can be prepared by PICS under right or left circularly polarized light (Figure c).8,9 Some other applications of the plasmonic hole ejection will also be mentioned. Enhancement of PICS with hole ejection through plasmon coupling10 and its application to photocatalysis will also be described.References Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005).T. Tatsuma, H. Nishi, and T. Ishida, Chem. Sci., 8, 3325 (2017) [review].T. Tatsuma and H. Nishi, Nanoscale Horiz., 5, 597-606 (2020) [review].E. Kazuma, N. Sakai, and T. Tatsuma, Chem. Commun., 47, 5777 (2011).I. Tanabe and T. Tatsuma, Nano Lett., 12, 5418 (2012).K. Saito, I. Tanabe, and T. Tatsuma, J. Phys. Chem. Lett., 7, 4363 (2016).H. Nishi, M. Sakamoto, and T. Tatsuma, Chem. Commun., 54, 11741 (2018).K. Saito and T. Tatsuma, Nano Lett., 18, 3209 (2018).K. Morisawa, T. Ishida, and T. Tatsuma, ACS Nano, 14, 3603 (2020).T. Ishida and T. Tatsuma, J. Phys. Chem. C, 122, 26153 (2018). Figure 1