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Gold Nanorods as a High-pressure Sensor of Phase Transitions and Refractive-Index Gauge

Abstract

Gold nanorods (Au NRs), nanospheres and other nanoparticles display numerous superior physicochemical properties, such as resistance to oxidation and aggressive agents, strong enhancement of local electric field and high absorption coefficient in the visible and near-infrared (NIR) range. The absorption peaks of surface plasmon resonance (SPR) in Au NRs are highly sensitive to their surrounding medium and to its refractive index (RI) changes. However, no applications of NRs for detecting phase transitions have been reported. Here we show that Au NRs effectively detect phase transitions of compressed compounds, liquid and solid, by measuring their RI. Owing to the direct interaction of the NRs with their surrounding medium, its subtle RI changes can be observed by the use of high-pressure absorption Vis-NIR spectroscopy. We have applied the Au NRs-based sensor for monitoring in a diamond anvil cell (DAC) the phase transitions of compressed water, its freezing to ice VI and at the subsequent solid-solid phase transition to ice VII, as well as the monotonic compression and solid-solid phase transitions in urea and in thiourea.

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Publication details

The article was accepted on 04 Apr 2019 and first published on 04 Apr 2019


Article type: Communication
DOI: 10.1039/C9NR02792K
Citation: Nanoscale, 2019, Accepted Manuscript

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    Gold Nanorods as a High-pressure Sensor of Phase Transitions and Refractive-Index Gauge

    M. Runowski, S. Sobczak, J. Marciniak, I. Bukalska, S. Lis and A. Katrusiak, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR02792K

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