Enhanced humidity sensing of functionalized reduced graphene oxide with 4-chloro-3-sulfophenylazo groups

Yuan Bai; Chao Zhi Zhang; Bin Chen; Hongqi Sun

doi:10.1016/j.snb.2019.02.056

Enhanced humidity sensing of functionalized reduced graphene oxide with 4-chloro-3-sulfophenylazo groups

Yuan Bai
, Chao Zhi Zhang
, Bin Chen
, Hongqi Sun

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

Humidity sensing material plays an important role in developing efficient humidity sensors. In this paper, reduced graphene oxide grafted by 4-chloro-3-sulfophenylazo groups (rGO-SC) was synthesized. Microstructure of rGO-SC was similar to that of rGO. Humidity sensors fabricated by rGO-SC exhibited three orders of magnitude change of its impedance, a high sensing response value (S = 2961.39), short response/recovery time (1.3 s / 23.5 s), and a small hysteresis (4.56%). A synergistic effect arising between sulfonic acid and Cl groups on rGO-SC surfaces improved the humidity sensing properties of the material. Experimental results showed that the humidity sensing of the rGO-SC was attributed to electronic or ionic conductivities at varying relative humidity, respectively.

Original language	English
Pages (from-to)	258-266
Number of pages	9
Journal	Sensors and Actuators, B: Chemical
Volume	287
DOIs	https://doi.org/10.1016/j.snb.2019.02.056
Publication status	Published - 15 May 2019
Externally published	Yes

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10.1016/j.snb.2019.02.056

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title = "Enhanced humidity sensing of functionalized reduced graphene oxide with 4-chloro-3-sulfophenylazo groups",

abstract = "Humidity sensing material plays an important role in developing efficient humidity sensors. In this paper, reduced graphene oxide grafted by 4-chloro-3-sulfophenylazo groups (rGO-SC) was synthesized. Microstructure of rGO-SC was similar to that of rGO. Humidity sensors fabricated by rGO-SC exhibited three orders of magnitude change of its impedance, a high sensing response value (S = 2961.39), short response/recovery time (1.3 s / 23.5 s), and a small hysteresis (4.56\%). A synergistic effect arising between sulfonic acid and Cl groups on rGO-SC surfaces improved the humidity sensing properties of the material. Experimental results showed that the humidity sensing of the rGO-SC was attributed to electronic or ionic conductivities at varying relative humidity, respectively.",

keywords = "Functionalization, Humidity sensing, Modified diazonium salt method, Reduced graphene oxide, Sulfonation",

author = "Yuan Bai and Zhang, \{Chao Zhi\} and Bin Chen and Hongqi Sun",

note = "Funding Information: This work was supported by National Natural Science Foundation of China (Grant No. 11305091 ), Six talent peaks project in Jiangsu Province (R2015L12). Appendix A Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = may,

day = "15",

doi = "10.1016/j.snb.2019.02.056",

language = "English",

volume = "287",

pages = "258--266",

journal = "Sensors and Actuators, B: Chemical",

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T1 - Enhanced humidity sensing of functionalized reduced graphene oxide with 4-chloro-3-sulfophenylazo groups

AU - Bai, Yuan

AU - Zhang, Chao Zhi

AU - Chen, Bin

AU - Sun, Hongqi

N1 - Funding Information: This work was supported by National Natural Science Foundation of China (Grant No. 11305091 ), Six talent peaks project in Jiangsu Province (R2015L12). Appendix A Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/5/15

Y1 - 2019/5/15

N2 - Humidity sensing material plays an important role in developing efficient humidity sensors. In this paper, reduced graphene oxide grafted by 4-chloro-3-sulfophenylazo groups (rGO-SC) was synthesized. Microstructure of rGO-SC was similar to that of rGO. Humidity sensors fabricated by rGO-SC exhibited three orders of magnitude change of its impedance, a high sensing response value (S = 2961.39), short response/recovery time (1.3 s / 23.5 s), and a small hysteresis (4.56%). A synergistic effect arising between sulfonic acid and Cl groups on rGO-SC surfaces improved the humidity sensing properties of the material. Experimental results showed that the humidity sensing of the rGO-SC was attributed to electronic or ionic conductivities at varying relative humidity, respectively.

AB - Humidity sensing material plays an important role in developing efficient humidity sensors. In this paper, reduced graphene oxide grafted by 4-chloro-3-sulfophenylazo groups (rGO-SC) was synthesized. Microstructure of rGO-SC was similar to that of rGO. Humidity sensors fabricated by rGO-SC exhibited three orders of magnitude change of its impedance, a high sensing response value (S = 2961.39), short response/recovery time (1.3 s / 23.5 s), and a small hysteresis (4.56%). A synergistic effect arising between sulfonic acid and Cl groups on rGO-SC surfaces improved the humidity sensing properties of the material. Experimental results showed that the humidity sensing of the rGO-SC was attributed to electronic or ionic conductivities at varying relative humidity, respectively.

KW - Functionalization

KW - Humidity sensing

KW - Modified diazonium salt method

KW - Reduced graphene oxide

KW - Sulfonation

UR - https://www.scopus.com/pages/publications/85061672521

U2 - 10.1016/j.snb.2019.02.056

DO - 10.1016/j.snb.2019.02.056

M3 - Article

AN - SCOPUS:85061672521

SN - 0925-4005

VL - 287

SP - 258

EP - 266

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

ER -

Enhanced humidity sensing of functionalized reduced graphene oxide with 4-chloro-3-sulfophenylazo groups

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