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Open AccessArticle

Construction of Multiple Switchable Sensors and Logic Gates Based on Carboxylated Multi-Walled Carbon Nanotubes/Poly(N,N-Diethylacrylamide)

by 1,†, 2,†, 1,†, 1, 3, 4 and 2,*
1
College of Pharmacy, Ningxia Medical University, Yinchuan 750004, China
2
School of Basic Medical Sciences, Ningxia Medical University, Yinchuan 750004, China
3
School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
4
State Key Laboratory of High-Efficiency Coal Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2018, 18(10), 3358; https://doi.org/10.3390/s18103358
Received: 3 September 2018 / Revised: 2 October 2018 / Accepted: 4 October 2018 / Published: 8 October 2018
(This article belongs to the Special Issue Membrane-Based Biosensing)
In this work, binary hydrogel films based on carboxylated multi-walled carbon nanotubes/poly(N,N-diethylacrylamide) (c-MWCNTs/PDEA) were successfully polymerized and assembled on a glassy carbon (GC) electrode surface. The electroactive drug probes matrine and sophoridine in solution showed reversible thermal-, salt-, methanol- and pH-responsive switchable cyclic voltammetric (CV) behaviors at the film electrodes. The control experiments showed that the pH-responsive property of the system could be ascribed to the drug components of the solutions, whereas the thermal-, salt- and methanol-sensitive behaviors were attributed to the PDEA constituent of the films. The CV signals particularly, of matrine and sophoridine were significantly amplified by the electrocatalysis of c-MWCNTs in the films at 1.02 V and 0.91 V, respectively. Moreover, the addition of esterase, urease, ethyl butyrate, and urea to the solution also changed the pH of the system, and produced similar CV peaks as with dilution by HCl or NaOH. Based on these experiments, a 6-input/5-output logic gate system and 2-to-1 encoder were successfully constructed. The present system may lead to the development of novel types of molecular computing systems. View Full-Text
Keywords: electrocatalysis; encoder; logic gate; matrine; sophoridine electrocatalysis; encoder; logic gate; matrine; sophoridine
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MDPI and ACS Style

Wu, X.; Bai, X.; Ma, Y.; Wei, J.; Peng, J.; Shi, K.; Yao, H. Construction of Multiple Switchable Sensors and Logic Gates Based on Carboxylated Multi-Walled Carbon Nanotubes/Poly(N,N-Diethylacrylamide). Sensors 2018, 18, 3358.

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