Selective microwave sensors exploiting the interaction of analytes with trap states in TiO2 nanotube arrays

Nanoscale
M H ZarifiK Shankar

Abstract

Sensing of molecular analytes by probing the effects of their interaction with microwaves is emerging as a cheap, compact, label-free and highly sensitive detection and quantification technique. Microstrip ring-type resonators are particularly favored for this purpose due to their planar sensing geometry, electromagnetic field enhancements in the coupling gap and compatibility with established printed circuit board manufacturing. However, the lack of selectivity in what is essentially a permittivity-sensing method is an impediment to wider adoption and implementation of this sensing platform. By placing a polycrystalline anatase-phase TiO2 nanotube membrane in the coupling gap of a microwave resonator, we engineer selectivity for the detection and differentiation of methanol, ethanol and 2-propanol. The scavenging of reactive trapped holes by aliphatic alcohols adsorbed on TiO2 is responsible for the alcohol-specific detection while the different short chain alcohols are distinguished on the basis of differences in their microwave response. Electrodeless microwave sensors which allow spectral and time-dependent monitoring of the resonance frequency and quality factor provide a wealth of information in comparison with electrode-...Continue Reading

References

Oct 28, 2003·Angewandte Chemie·Shanmugasundaram Sakthivel, Horst Kisch
Dec 30, 2006·Analytical Chemistry·Radislav A Potyrailo, William G Morris
Mar 16, 2007·Nano Letters·C SociD Wang
May 19, 2012·Nanotechnology·Vardan GalstyanGiorgio Sberveglieri
Dec 28, 2012·Journal of the American Chemical Society·Katherine R PhillipsCynthia M Friend
Nov 5, 2013·Sensors·Vardan GalstyanGiorgio Sberveglieri
Apr 29, 2015·ACS Applied Materials & Interfaces·A HazraP Bhattacharyya

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Citations

Jul 28, 2016·Biosensors & Bioelectronics·Sohini RoyChoudhuryShekhar Bhansali
Jan 11, 2018·Scientific Reports·Mohammad Hossein ZarifiAmir Sanati-Nezhad
Jun 21, 2020·Sensors·Irina YaroshenkoAndrey Legin
Jun 12, 2021·Journal of Hazardous Materials·Aida Javadian-SarafMohammad Arjmand
Jul 14, 2021·ACS Applied Materials & Interfaces·Kasra Khorsand KazemiMohammad H Zarifi
Jul 10, 2019·ACS Applied Materials & Interfaces·Jie LiuHans-Jürgen Butt
Aug 31, 2017·Journal of the American Chemical Society·Xia ShengLei Jiang
Sep 4, 2021·ACS Applied Materials & Interfaces·Ehsan VahidzadehKarthik Shankar

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