scholarly journals Aerogels Based on Reduced Graphene Oxide/Cellulose Composites: Preparation and Vapour Sensing Abilities

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1729
Author(s):  
Yian Chen ◽  
Petra Pötschke ◽  
Jürgen Pionteck ◽  
Brigitte Voit ◽  
Haisong Qi
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Vapour ◽  
Conductive Filler ◽  
High Sensitivity ◽  
Solubility Parameters ◽  
Urea Solution ◽  
Cellulose Composites ◽  
Reduced Graphene ◽  
Composite Aerogels

This paper reports on the preparation of cellulose/reduced graphene oxide (rGO) aerogels for use as chemical vapour sensors. Cellulose/rGO composite aerogels were prepared by dissolving cellulose and dispersing graphene oxide (GO) in aqueous NaOH/urea solution, followed by an in-situ reduction of GO to reduced GO (rGO) and lyophilisation. The vapour sensing properties of cellulose/rGO composite aerogels were investigated by measuring the change in electrical resistance during cyclic exposure to vapours with varying solubility parameters, namely water, methanol, ethanol, acetone, toluene, tetrahydrofuran (THF), and chloroform. The increase in resistance of aerogels on exposure to vapours is in the range of 7 to 40% with methanol giving the highest response. The sensing signal increases almost linearly with the vapour concentration, as tested for methanol. The resistance changes are caused by the destruction of the conductive filler network due to a combination of swelling of the cellulose matrix and adsorption of vapour molecules on the filler surfaces. This combined mechanism leads to an increased sensing response with increasing conductive filler content. Overall, fast reaction, good reproducibility, high sensitivity, and good differentiation ability between different vapours characterize the detection behaviour of the aerogels.

scholarly journals Fabrication of macroporous reduced graphene oxide composite aerogels reinforced with chitosan for high bilirubin adsorption

RSC Advances ◽  
2018 ◽  
Vol 8 (15) ◽  
pp. 8338-8348 ◽  
Author(s):  
Zhentao Li ◽  
Xi Song ◽  
Siyuan Cui ◽  
Yanpeng Jiao ◽  
Changren Zhou
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Adsorption Properties ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Composite Aerogels ◽  
Bilirubin Adsorption ◽  
High Bilirubin

Chitosan reinforced macroporous reduced graphene oxide composite aerogels were fabricated with high bilirubin adsorption properties.

An Electrochemically Reduced Copper/Reduced Graphene Oxide Film Modified Electrode for Sensitive Non-Enzymatic Glucose Detection in Human Serum

2021 ◽  
Author(s):  
Sopit Phetsang ◽  
Pinit Kidkhunthod ◽  
Narong Chanlek ◽  
Jaroon Jakmunee ◽  
Pitchaya Mungkornasawakul ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Human Serum ◽  
Reduced Graphene Oxide ◽  
Modified Electrode ◽  
Electrocatalytic Activity ◽  
Glucose Sensor ◽  
Electrochemical Sensors ◽  
High Sensitivity ◽  
Detection Range ◽  
Reduced Graphene

Abstract Numerous studies suggest that modification with functional nanomaterials can enhance the electrode electrocatalytic activity, sensitivity, and selectivity of the electrochemical sensors. Here, a highly sensitive and cost-effective disposable non-enzymatic glucose sensor based on copper(II)/reduced graphene oxide modified screen-printed carbon electrode is demonstrated. Facile fabrication of the developed sensing electrodes is carried out by the adsorption of copper(II) onto graphene oxide modified electrode, then following the electrochemical reduction. The proposed sensor illustrates good electrocatalytic activity toward glucose oxidation with a wide linear detection range from 0.10 mM to 12.5 mM, low detection limit of 65 µM, and high sensitivity of 172 µA mM− 1 cm− 2 along with satisfactory anti-interference ability, reproducibility, stability, and the acceptable recoveries for the detection of glucose in a human serum sample (95.6–106.4%). The copper(II)/reduced graphene oxide based sensor with the superior performances is a great potential for the quantitation of glucose in real samples.

scholarly journals Ammonia Gas Detection by Tannic Acid Functionalized and Reduced Graphene Oxide at Room Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Sweejiang Yoo ◽  
Xin Li ◽  
Yuan Wu ◽  
Weihua Liu ◽  
Xiaoli Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensor ◽  
Tannic Acid ◽  
Room Temperature ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Gas Detection ◽  
Ammonia Gas ◽  
Reduced Graphene

Reduced graphene oxide (rGO) based chemiresistor gas sensor has received much attention in gas sensing for high sensitivity, room temperature operation, and reversible. Here, for the first time, we present a promising chemiresistor for ammonia gas detection based on tannic acid (TA) functionalized and reduced graphene oxide (rGOTA functionalized). Green reductant of TA plays a major role in both reducing process and enhancing the gas sensing properties ofrGOTA functionalized. Our results showrGOTA functionalizedonly selective to ammonia with excellent respond, recovery, respond time, and recovery times.rGOTA functionalizedelectrical resistance decreases upon exposure to NH3where we postulated that it is due to n-doping by TA and charge transfer betweenrGOTA functionalizedand NH3through hydrogen bonding. Furthermore,rGOTA functionalizedhinders the needs for stimulus for both recovery and respond. The combination of greener sensing material and simplicity in overall sensor design provides a new sight for green reductant approach of rGO based chemiresistor gas sensor.

Schottky diode characteristics and 1/f noise of high sensitivity reduced graphene oxide/Si heterojunction photodetector

2016 ◽  
Vol 119 (12) ◽  
pp. 124303 ◽  
Author(s):  
Miao Zhu ◽  
Xinming Li ◽  
Xiao Li ◽  
Xiaobei Zang ◽  
Zhen Zhen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Schottky Diode ◽  
High Sensitivity ◽  
Reduced Graphene

Performance of oil sorbents based on reduced graphene oxide–silica composite aerogels

2020 ◽  
Vol 8 (1) ◽  
pp. 103632 ◽  
Author(s):  
Swapneel Vijay Thakkar ◽  
Andrea Pinna ◽  
Carlo Maria Carbonaro ◽  
Luca Malfatti ◽  
Pablo Guardia ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Silica Composite ◽  
Reduced Graphene ◽  
Oil Sorbents ◽  
Composite Aerogels

scholarly journals Cobalt-Dispersed Reduced Graphene Oxide Nanocomposite for the Selective lectrochemical Detection of Methyl Nicotinate

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 18
Author(s):  
KumarBairagi ◽  
Goyal ◽  
NishithVerma
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
High Sensitivity ◽  
Polymer Nanocomposite ◽  
Differential Pulse ◽  
Methyl Nicotinate ◽  
Reduced Graphene ◽  
Phenolic Polymer ◽  
Co Nanoparticles

Methyl nicotinate (MN) is an important tuberculosis biomarker, and can be effectively measured using electrochemical methods. In this study, we have developed a novel N-doped phenolic polymer nanocomposite in situ dispersed with reduced graphene oxide and cobalt (Co)-nanoparticles as a sensor electrode (Co-rGO/PC). Co-nanoparticles were used for the MN recognition. Carbonization was performed for the reduction of GO and the synthesis of Co-nanoparticles. The prepared electrode materials were characterized using SEM, EDS, EIS, and CV. Tested using differential pulse voltammetry, Co-rGO/PC showed its pplicability (RSD < 6%) over 0.05–20.0 mg L−1 MN concentration with high sensitivity (S/N ratio = 3). The present method and materials can also be used for the development of sensors for the other biomarkers.

Tuning the direct growth of Agseeds into bimetallic Ag@Cu nanorods on surface functionalized electrochemically reduced graphene oxide: enhanced nitrite detection

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48236-48245 ◽  
Author(s):  
S. E. Jeena ◽  
P. Gnanaprakasam ◽  
Arun Dakshinamurthy ◽  
T. Selvaraju
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Sensitivity ◽  
Oxide Surface ◽  
Nitrite Ion ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
Direct Growth ◽  
1D Nanostructure ◽  
Good Detection Limit

The significant challenges in the growth of 1D nanostructure on reduced graphene oxide surface were addressed. It enabled the electrooxidation of the nitrite ion (NO2−) with high sensitivity and good detection limit of 1 nM.

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