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Biosens. Bioelectron., Mar 18 2024, 254 S0956-5663(24)00228-8 | https://doi.org/10.1016/j.bios.2024.116223 Long-term stable pH sensor array with synergistic bilayer structure for 2D real-time mapping in cell culture monitoring

Jimin Lee ^a,b, Ira Soltis ^a,b, Sayre A. Tillery ^c, Sung Hoon Lee^a,d, Hodam Kim ^a,b, Woon-Hong Yeo ^a,b,e,f

^aGeorge W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

^bIEN Center for Wearable Intelligent Systems and Healthcare at the Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA, 30332, USA

^cStephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK, 73019, USA

^dSchool of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

^eWallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, Atlanta, GA, 30332, USA

^fParker H. Petit Institute for Bioengineering and Biosciences, Institute for Robotics and Intelligent Machines, Georgia Institute of Technology, Atlanta, GA, 30332, USA

Corresponding author : Woon-Hong Yeo

Abstract

Pursuing accurate, swift, and durable pH sensors is important across numerous fields, encompassing healthcare, environmental surveillance, and agriculture. In particular, the emphasis on real-time pH monitoring during cell cultivation has become increasingly pronounced in the current scientific environment-a crucial element being diligently researched to ensure optimal cell production. Both polyaniline (PANi) and iridium oxide (IrO _x) show their worth in pH sensing, yet they come with challenges. Single-PANi-layered pH sensors often grapple with diminished sensitivity and lagging responses, while electrodeposited IrO _x structures exhibit poor adhesion, leading to their separation from metallic substrates-a trait undesirable for a consistently stable, long-term pH sensor. This paper introduces a bi-layered PANi-IrO _x pH sensor, strategically leveraging the advantages of both materials. The results presented here underscore the sensitivity enhancement of binary-phased framework, faster response time, and more robust structure than prior work. Through this synergistic strategy, we demonstrate the potential of integrating different phases to overcome the inherent constraints of individual materials, setting the stage for advanced pH-sensing solutions.

논문정보

형식Research article
게재일2024년 03월 (BRIC 등록일 2024-03-26)
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