國家衛生研究院 NHRI:Item 3990099045/10292
English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 12145/12927 (94%)
造訪人次 : 916182      線上人數 : 1413
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧：
  • 您可在西文檢索詞彙前後加上"雙引號"，以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋，建議至進階搜尋限定作者欄位，可獲得較完整資料
    •  進階搜尋
    主頁 ‧ 登入 ‧ 上傳 ‧ 說明 ‧ 關於NHRI ‧ 管理 到手機版


    請使用永久網址來引用或連結此文件: http://ir.nhri.org.tw/handle/3990099045/10292


    題名: Monitoring the transient thermal infrared emission of gold nanoparticles upon photoexcitation with a step-scan fourier-transform spectrometer
    作者: Liu, JL;Yang, YT;Lin, CT;Yu, YJ;Chen, JK;Chu, LK
    貢獻者: Institute of Biomedical Engineering and Nanomedicine
    摘要: The transient photothermal process of gold nanoparticles (AuNP) capped with different molecules, namely, citrate, cetyltrimethylammonium bromide (CTAB), and methoxyl-polyethylene glycol thiol (mPEG), has been investigated by time-resolved infrared emission spectroscopy monitored with a step-scan Fourier-transform spectrometer. Upon photoexcitation of the surface plasmonic resonance band of AuNPs with a 532 nm nanosecond pulsed laser, the transient infrared emission was observed within about 1 mu s, referring to the duration of the laser heating and thermalization of AuNPs. Comparing the infrared emission contours with the blackbody radiation spectra at different temperatures revealed that the temperature reached 400 +/- 100 degrees C in 90-120 ns as the 24 nm mPEG-capped AuNPs were excited by a peak power of 5 x 10(10) W m(-2) (25 MJ cm(-2) from a 5 ns pulsed laser) at 532 nm. The insignificant changes in the morphology and size distribution of mPEG-AuNP suggested that the surface modification via covalent bonding helped retention of the morphology of the nanostructures after laser heating. In addition, photoexcitation of 35 nm CTAB-AuNPs generated a higher transient temperature than that of 89 nm CTAB-AuNP; this is consistent with the prediction by Mie theory that smaller nanoparticles possess a higher contribution of absorption in the extinction coefficient, which leads to higher photothermal efficiency. This is the first time that the transient broadband thermal infrared, emission of the photoexcited gold nanoparticles has been recorded within a submicrosecond, which is close to the nascent condition. The duplexity in the temporal capability and broadband spectroscopic window of the time-resolved emission infrared spectroscopy provides a promising noncontact thermometer to illustrate the photothermal process and quantify the transient temperatures of miscellaneous metallic nanostructures upon photoexcitation.
    日期: 2017-01
    關聯: Journal of Physical Chemistry C. 2017 Jan;121(1):878-885.
    Link to: http://dx.doi.org/10.1021/acs.jpcc.6b10044
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1932-7447&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000392035500092
    Cited Times(Scopus): https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85035146573
    顯示於類別:[陳仁焜] 期刊論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    ISI000392035500092.pdf5094KbAdobe PDF387檢視/開啟


    在NHRI中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋