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Single Gold Nanorod Charge Modulation in an Ion Gel Device
Collins, Sean S. E.1,2; Wei, Xingzhan1,2,5; McKenzie, Thomas G.3; Funston, Alison M.4; Mulvaney, Paul1,2
2016-11-01
摘要A reliable and reproducible method to rapidly charge single gold nanocrystals in a solid-state device is reported. Gold nanorods (Au NRs) were integrated into an ion gel capacitor, enabling them to be charged in a transparent and highly capacitive device, ideal for optical transmission. Changes in the electron concentration of a single Au NR were observed with dark-field imaging spectroscopy via localized surface plasmon resonance (LSPR) shifts in the scattering spectrum. A time resolved, laser-illuminated, dark-field system was developed to enable direct measurement of single particle charging rates with time resolution below one millisecond. The added sensitivity of this new approach has enabled the optical detection of fewer than 110 electrons on a single Au NR. Single wavelength resonance shifts provide a much faster, more sensitive method for all surface plasmon-based sensing applications.
关键词Gold nanorods single particle spectroscopy plasmonics dark-field microscopy ion gel solid-state charging
DOI10.1021/acs.nanolett.6b02696
发表期刊NANO LETTERS
ISSN1530-6984
卷号16期号:11页码:6863-6869
通讯作者Mulvaney, P (reprint author), Univ Melbourne, Sch Chem, Parkville, Vic 3010, Australia. ; Mulvaney, P (reprint author), Univ Melbourne, Inst Bio21, Parkville, Vic 3010, Australia.
收录类别SCI
WOS记录号WOS:000387625000023
语种英语