Xi Min, Reinhard Björn M
Department of Chemistry and the Photonics Center, Boston University, Boston, Massachusetts 02215, United States.
J Phys Chem C Nanomater Interfaces. 2018 Mar 15;122(10):5698-5704. doi: 10.1021/acs.jpcc.8b01283. Epub 2018 Feb 20.
Sn-doped indium oxide (ITO) nanocrystals (NC) provide tunable localized surface plasmon resonance in the mid-infrared. To evaluate the applicability of these n-doped plasmonic semiconductors in field-enhanced spectroscopies, it is necessary to assess how the low, free-electron density affects the E-field localization and plasmon coupling in NC films when compared to metal nanoparticles (NP). In this article, we investigate plasmon coupling between approximate 6 nm diameter ITO NC on the collective resonance and quantify the effect of the electromagnetic field enhancement on the absorbance signal of surface-attached ligands in NC films and monolayers with different ratios of doped and undoped indium oxide NC.
掺锡氧化铟（ITO）纳米晶体（NC）在中红外区域提供了可调节的局域表面等离子体共振。为了评估这些n型掺杂等离子体半导体在场增强光谱学中的适用性，有必要评估与金属纳米颗粒（NP）相比，低自由电子密度如何影响NC薄膜中的电场局域化和等离子体耦合。在本文中，我们研究了直径约6nm的ITO NC在集体共振时的等离子体耦合，并量化了不同掺杂和未掺杂氧化铟NC比例的NC薄膜和单层中，电磁场增强对表面附着配体吸光度信号的影响。
