Graphene oxide quantum dots attached on wood-derived nanocellulose to fabricate a highly sensitive humidity sensor

被引：25
作者：
Huang L. [1 ,2 ]
Yang Y. [1 ,2 ]
Ti P. [1 ,2 ]
Su G. [1 ,2 ]
Yuan Q. [1 ,2 ]
机构：
[1] School of Resources, Environment and Materials, Guangxi University, Nanning
[2] MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials & Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning
来源：
Carbohydrate Polymers | 2022年 / 288卷
基金：
中国国家自然科学基金;
关键词：
Aerogel; Capacitive humidity sensor; Flexibility; Graphene oxide quantum dots; Wood-derived nanocellulose;
D O I：
10.1016/j.carbpol.2022.119312
中图分类号：
学科分类号：
摘要：
Herein, cellulose nanofibril (CNF) with various carboxyl amounts were prepared via regulating its oxidation degree using TEMPO oxidation. The CNF dispersion was dropped onto the interdigital electrode to be capacitive humidity sensor by the subsequent vacuum freeze-drying. Pure CNF-7 (NaClO content of 7 mmol/g) humidity sensor involves in orderly porous structure, which displays better performance than other CNFs for its moderate carboxyl content and dimension. As uniformly adding appropriate content of graphene oxide quantum dots (GOQD) with larger surface area and active sites, it can be attached on the CNF to construct a three-dimensional interconnected porous structure for their excellent aqueous dispersity as well as differences in morphology and size. Consequently, the CNF/GOQD sensor exhibits the sensitivity as high as 51,840.91 pF/% RH, short response time (30 s)/recovery time (11 s) and excellent reproducibility. The proposed method can provide effective guidance for the design of humidity sensors based on nanomaterials. © 2022 Elsevier Ltd
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