title: White-Light-Induced Collective Heating of Gold Nanocomposite/Bombyx mori Silk Thin Films with Ultrahigh Broadband Absorbance.
abstract: This paper describes a systematic investigation of the phenomenon of white-light-induced heating in silk fibroin films embedded with gold nanoparticles (Au NPs). The Au NPs functioned to develop an ultrahigh broadband absorber, allowing white light to be used as a source for photothermal generation. With an increase of the Au content in the composite films, the absorbance was enhanced significantly around the localized surface plasmon resonance (LSPR) wavelength, while non-LSPR wavelengths were also increased dramatically. The greater amount of absorbed light increased the rate of photoheating. The optimized composite film exhibited ultrahigh absorbances of approximately 95% over the spectral range from 350 to 750 nm, with moderate absorbances (>60%) at longer wavelengths (750-1000 nm). As a result, the composite film absorbed almost all of the incident light and, accordingly, converted this optical energy to local heat. Therefore, significant temperature increases (ca. 100 °C) were readily obtained when we irradiated the composite film under a light-emitting diode or halogen lamp. Moreover, such composite films displayed linear light-to-heat responses with respect to the light intensity, as well as great photothermal stability. A broadband absorptive film coated on a simple Al/Si Schottky diode displayed a linear, significant, stable photo-thermo-electronic effect in response to varying the light intensity.
authors.affiliation: Institute of Biomedical Engineering, National Tsing Hua University , Hsinchu, Taiwan 300.
authors.forename: Shao Hsuan
authors.initials: SH
authors.lastname: Tsao
authors.affiliation: Institute of Biomedical Engineering, National Tsing Hua University , Hsinchu, Taiwan 300.
authors.forename: Dehui
authors.initials: D
authors.lastname: Wan
authors.affiliation: National Nano Device Laboratories, National Applied Research Laboratories , Hsinchu, Taiwan 300.
authors.forename: Yu-Sheng
authors.initials: YS
authors.lastname: Lai
authors.affiliation: National Nano Device Laboratories, National Applied Research Laboratories , Hsinchu, Taiwan 300.
authors.forename: Ho-Ming
authors.initials: HM
authors.lastname: Chang
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University , Taipei, Taiwan 10617.
authors.forename: Chen-Chieh
authors.initials: CC
authors.lastname: Yu
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University , Taipei, Taiwan 10617.
authors.forename: Keng-Te
authors.initials: KT
authors.lastname: Lin
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University , Taipei, Taiwan 10617.
authors.forename: Hsuen-Li
authors.initials: HL
authors.lastname: Chen
mesh_terms: D000818:Animals; D012831:Bombyx / Q000737:chemistry*; D005349:Fibroins / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006358:Hot Temperature; D008027:Light; D053761:Nanocomposites / Q000737:chemistry*; D020349:Surface Plasmon Resonance
chemical_list: D006046:Gold; D005349:Fibroins
keywords: broadband absorber; gold nanoparticles; photothermal effect; silk fibroin; surface plasmon resonance; white-light illumination