title: Surface plasmon resonance enhanced light absorption and photothermal therapy in the second near-infrared window.
abstract: Enhanced near-field at noble metal nanoparticle surfaces due to localized surface plasmon resonance (LSPR) has been researched in fields ranging from biomedical to photoelectrical applications. However, it is rarely explored on nonmetallic nanomaterials discovered in recent years, which can also support LSPR by doping-induced free charge carriers, let alone the investigation of an intricate system involving both. Here we construct a dual plasmonic hybrid nanosystem Au-Cu9S5 with well controlled interfaces to study the coupling effect of LSPR originating from the collective electron and hole oscillations. Cu9S5 LSPR is enhanced by 50% in the presence of Au, and the simulation results confirm the coupling effect and the enhanced local field as well as the optical power absorption on Cu9S5 surface. This enhanced optical absorption cross section, high photothermal transduction efficiency (37%), large light penetration depth at 1064 nm, excellent X-ray attenuation ability, and low cytotoxicity enable Au-Cu9S5 hybrids for robust photothermal therapy in the second near-infrared (NIR) window with low nanomaterial dose and laser flux, making them potential theranostic nanomaterials with X-ray CT imaging capability. This study will benefit future design and optimization of photoabsorbers and photothermal nanoheaters utilizing surface plasmon resonance enhancement phenomena for a broad range of applications.
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Xianguang
authors.initials: X
authors.lastname: Ding
authors.forename: Chi Hao
authors.initials: CH
authors.lastname: Liow
authors.forename: Mengxin
authors.initials: M
authors.lastname: Zhang
authors.forename: Renjun
authors.initials: R
authors.lastname: Huang
authors.forename: Chunyan
authors.initials: C
authors.lastname: Li
authors.forename: He
authors.initials: H
authors.lastname: Shen
authors.forename: Mengya
authors.initials: M
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Zou
authors.forename: Nan
authors.initials: N
authors.lastname: Gao
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Li
authors.forename: Qiangbin
authors.initials: Q
authors.lastname: Wang
authors.forename: Shuzhou
authors.initials: S
authors.lastname: Li
authors.forename: Jiang
authors.initials: J
authors.lastname: Jiang