期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 15, 页码 12226-12234出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501724h
关键词
pH sensor; tungsten oxide nanoparticles; hydrothermal synthesis; electrodeposition; flexible; lightweight
资金
- Portuguese Science Foundation (FCT-MEC) [EXCL/CTM-NAN/0201/2012, PEst-C/CTM/LA0025/2013-14]
- FCT-MCTES [SFRH/BD/73810/2010, SFRH/BD/76004/2011]
- ERC [228144]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/73810/2010, SFRH/BD/76004/2011] Funding Source: FCT
pH is a vital physiological parameter that can be used for disease diagnosis and treatment as well as in monitoring other biological processes. Metal/metal oxide based pH sensors have several advantages regarding their reliability, miniaturization, and cost-effectiveness, which are critical characteristics for in vivo applications. In this work, WO3 nanoparticles were electrodeposited on flexible substrates over metal electrodes with a sensing area of 1 mm(2). These sensors show a sensitivity of -56.7 +/- 1.3 mV/pH, in a wide pH range of 9 to 5. A proof of concept is also demonstrated using a flexible reference electrode in solid electrolyte with a curved surface. A good balance between the performance parameters (sensitivity), the production costs, and simplicity of the sensors was accomplished, as required for wearable biomedical devices.
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