Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 6, Pages 2442-2448Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp3030864
Keywords
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Funding
- National Science Council in Taiwan [NSC 100-2120-M-007-001]
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A novel electrical detection method based on surface acoustic wave (SAW) is introduced to investigate the heat generation from a two-dimensional (2D) or three-dimensional (3D) dose-packed gold nanopartide (AuNP) array exhibiting tunable collective surface plasmon resonance (CSPR). We have found that the SAW sensor can detect the CSPR-induced photothermal heating effect. The conversion of absorbed light around the CSPR frequency into heat and subsequent transfer from the AuNP array to the lithium niobate (LiNbO3) substrate allows a dual delay-line SAW system to dynamically measure the resonant frequency change of the SAW oscillator coated with a 2D or 3D AuNP array. The experimental findings indicate that SAW detection provides an ultrasensitive (detection limit of temperature change <1 x 10(-3) degrees C) electrical readout scheme for measuring the collective plasmonic heating of close-packed AuNP arrays with a linear dynamic range of incident light intensity and a designable CSPR spectral response.
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