12/5 專題演講公告

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上層分類：系所公告

分類：演講

建立於 2016-11-29, 週二 15:39

最近更新於 2016-12-05, 週一 15:23

發佈於：2016-11-29, 週二 15:47

點擊數：2468

講者：萬德輝 博士

題目：奈米金屬/高分子複合材料之光學性質與生醫應用

演講人：萬德輝 博士

服務單位：清華大學生物醫學所 助理教授

演講題目：奈米金屬/高分子複合材料之光學性質與生醫應用

演講時間：105年12月5日(星期一) 早上 10 點 10 分

演講地點：工綜館B03

個人學經歷：

學歷

國立台灣大學 材料系 博士(2010)

國立台灣大學 化學系 學士(2003)

經歷(現職)

國立清華大學醫工所 助理教授(2013~)

經歷(曾經)

美國喬治亞理工學院 醫工系 博士後研究員(2011~2012)
國立台灣大學 材料系 博士後研究(2010)

 

研究興趣：

1. 奈米金屬材料的形貌控制
2. 奈米金屬材料的光學及催化性質
3. 奈米金屬材料在光動力及光熱療法之應用
4. 奈米金屬材料在化學及生醫感測之應用

 

演講摘要：

Gold nanostructures have proven to be a versatile platform for a broad range of optical applications. They are attractive for their surface plasmon resonance (SPR) properties. The strong interactions between metallic nanoparticles (NPs) and incident light originate from excitation of the collective oscillations of conduction electrons within these particles. In this talk, I will introduce our recent work on the fabrication of metal nanostructures/polymer composites, and their optical properties and applications.

First part describes a systematic investigation of the phenomenon of white light–induced heating in silk fibroin (SF) 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. Upon increasing the Au content in the composite films, the absorbance was enhanced significantly around the SPR wavelength, while also increasing dramatically at non-SPR wavelengths. 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 the entire incident light and, accordingly, converted this optical energy to local heat.

Second part illustrates a paper-based plasmonic sensor by embedding metal NPs onto flexible paper substrates using reversal nanoimprint lithography (rNIL) technology. This fabrication takes the advantages from a combination of chemical and physical formation approaches: (i) metal NPs were chemically synthesized in a colloidal solution, thereby providing the tunability of NP composition/shape; (ii) the metal NPs were then immobilized onto reusable solid molds (e.g., glass, silicon) via a facile NP self-assembly process, thereby routinely producing monolayer, well-dispersed NP arrays in high density, and (iii) the metal NP arrays were directly transferred from solid molds onto paper substrates without any surface-modification via rNIL technology, thereby robustly providing rapid fabrication (requiring only a few minutes), large-area throughput, and cost-effective processes. Therefore, we believe that the NP-embedded papers can be developed into simple, inexpensive, portable, disposable, and highly sensitive SPR-based sensors.

Keywords： surface plasmon resonance, nanoparticles, silk fibroin, nanoimprinting, photo-detectors, chemical sensing