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

Lijun Huang; Yutong Yang; Pu Ti; Guoting Su; Quanping Yuan

doi:10.1016/j.carbpol.2022.119312

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

Carbohydr Polym. 2022 Jul 15:288:119312. doi: 10.1016/j.carbpol.2022.119312. Epub 2022 Mar 4.

Authors

Lijun Huang¹, Yutong Yang¹, Pu Ti¹, Guoting Su¹, Quanping Yuan²

Affiliations

¹ School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; 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 530004, China.
² School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; 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 530004, China. Electronic address: yuanquanping@gxu.edu.cn.

PMID: 35450617
DOI: 10.1016/j.carbpol.2022.119312

Abstract

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.

Keywords: Aerogel; Capacitive humidity sensor; Flexibility; Graphene oxide quantum dots; Wood-derived nanocellulose.

MeSH terms

Cellulose / chemistry
Graphite
Humidity
Quantum Dots*
Reproducibility of Results
Wood* / chemistry

Substances

graphene oxide
Graphite
Cellulose