pH sensitive multiwalled carbon nanotubes |
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| Affiliation: | 1. Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul 136-713, Republic of Korea;2. Department of Physics, Korea University, Seoul 136-713, Republic of Korea;1. Graduate Institute of Electro-Optical Engineering & Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;2. Department of Information Technology & Communication, Shih Chien University, Kaohsiung Campus, Neimen, Kaohsiung 845, Taiwan;1. Department of Molecular Biology and Biotechnology, Tezpur (Central) University, Tezpur, P.O.-Napaam-784028, Sonitpur, Assam, India;2. DBT Nodal Cell, Tezpur (Central) University, Tezpur, P.O.-Napaam-784028, Sonitpur, Assam, India;1. Department of Electrical and Computer Engineering, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada;2. Advanced Materials Laboratory, Xerox Research Centre of Canada, 2660 Speakman Drive, Mississauga, ON L5K 2L1, Canada;3. Waterloo Institute of Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada;1. Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi?an 710032, China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | The CNTs-based sensors have received considerable attention because of their outstanding properties, such as faster response, higher sensitivity, and lower operating temperature. And we expect that CNTs-based electrochemical sensors offer substantial improvements in the performance of pH sensing device. This letter reports experimental results that demonstrate the pH sensing capability of the multiwalled carbon nanotubes (MWCNTs) film by using the thermal chemical vapor deposition (thermal CVD). It was found that electronic properties of MWCNTs can be changed by the introduction of different pH value solutions. The absorption of the hydroxide in pH buffer solution changes conductivity of the MWCNTs. We observed in situ measurement of electrical conductivity by cycling solution range from acid to base. |
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