Thermal stability and energy harvesting characteristics of Au nanorods: harsh environment chemical sensing

Nicholas Karker; Gnanaprakash Dharmalingam; Michael A. Carpenter

doi:10.1117/12.2177211

13 May 2015 Thermal stability and energy harvesting characteristics of Au nanorods: harsh environment chemical sensing

Nicholas Karker, Gnanaprakash Dharmalingam, Michael A. Carpenter

Proceedings Volume 9491, Sensors for Extreme Harsh Environments II; 94910I (2015) https://doi.org/10.1117/12.2177211
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

Monitoring the levels of polluting gases such as CO and NO_x from high temperature (500°C and higher) combustion environments requires materials with high thermal stability and resilience that can withstand harsh oxidizing and reducing environments. Au nanorods (AuNRs) have shown potential in plasmonic gas sensing due to their catalytic activity, high oxidation stability, and absorbance sensitivity to changes in the surrounding environment. By using electron beam lithography, AuNR geometries can be patterned with tight control of the rod dimensions and spacings, allowing tunability of their optical properties. Methods such as NR encapsulation within an yttria-stabilized zirconia overcoat layer with subsequent annealing procedures will be shown to improve temperature stability within a simulated harsh environment. Since light sources and spectrometers are typically required to obtain optical measurements, integration is a major barrier for harsh environment sensing. Plasmonic sensing results will be presented where thermal energy is harvested by the AuNRs, which replaces the need for an external incident light source. Results from gas sensing experiments that utilize thermal energy harvesting are in good agreement with experiments which use an external incident light source. Principal component analysis results demonstrate that by selecting the most “active” wavelengths in a plasmonic band, the wavelength space can be reduced from hundreds of monitored wavelengths to just four, without loss of information about selectivity of the AuNRs. By combining thermal stability, the thermal energy harvesting capability, and the selectivity in gas detection (achieved through multivariate analysis), integration of plasmonic sensors into combustion environments can be greatly simplified.

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Nicholas Karker, Gnanaprakash Dharmalingam, and Michael A. Carpenter "Thermal stability and energy harvesting characteristics of Au nanorods: harsh environment chemical sensing", Proc. SPIE 9491, Sensors for Extreme Harsh Environments II, 94910I (13 May 2015); https://doi.org/10.1117/12.2177211

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KEYWORDS

Plasmonics

Principal component analysis

Combustion

Environmental sensing

Energy harvesting

Thermography

Light sources

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