In-Situ ESEM and EELS Observation of Water Uptake and Ice Formation in Multilayer Graphene Oxide

Daio, Takeshi; Bayer, Thomas; Ikuta, Tatsuya; Nishiyama, Takashi; Takahashi, Koji; Takata, Yasuyuki; Sasaki, Kazunari; Lyth, Stephen Matthew

doi:10.1038/srep11807

Cited by 28 publications

(21 citation statements)

References 41 publications

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“…17 GO has also proven to be a potential candidate for water purification and humidity sensors. 18 Generally, these electrical-type GO-based humidity sensors exhibit low conductivity because of the interruption of the conjugated electronic state in GO and are less moisture sensitive in nature. Conductivity may be partially restored by using reduced GO (rGO), but it is far behind that of pristine graphene.…”

Section: Introductionmentioning

confidence: 99%

Impact of Doping on GO: Fast Response–Recovery Humidity Sensor

Rathi

Pal

2017

ACS Omega

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Nowadays, humidity sensors have become essential in numerous applications. However, there are several problems while using them for humidity detection, such as low sensitivity, delayed response and recovery times, less stability, and narrow humidity detection ranges. Here, we demonstrate for the first time a highly sensitive chemiresistive sensor for low-level humidity detection in ambient atmosphere by introducing graphene oxide (GO) and doped GO (Li-doped GO and B-doped GO) as a thin film in a facile manner. The sensitivity, repeatability, and stability studies show that thin film-based fabricated humidity sensors are unprecedently efficient in the detection of different percentages of humidity from 11 to 97% at room temperature. The incorporation of doping into GO induces a dramatic change in the sensing behavior of the base film (undoped GO). This allows the sensor to be used in a variety of applications such as humidity sensing, which we validate through our experiment with a “cheap and readily available” recognition system.

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Section: Introductionmentioning

confidence: 99%

Impact of Doping on GO: Fast Response–Recovery Humidity Sensor

Rathi

Pal

2017

ACS Omega

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“…At high humidity electronic conductivity is negligible due to the presence of intercalated water and the large interlayer spacing, blocking electron-conducting pathways between sp 2 regions of the carbon. At low relative humidity the interlayer spacing decreases as water is removed from the membrane [60]. This provides the opportunity for electron percolation from layer to layer, along a pathway of local sp 2 regions [61].…”

Section: Ion Exchange Capacity Ionic Conductivity and Activation Enmentioning

confidence: 99%

Alkaline anion exchange membranes based on KOH-treated multilayer graphene oxide

Bayer

Cunning

Selyanchyn

et al. 2016

Journal of Membrane Science

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A novel class of alkaline anion exchange membrane (AAEM) is presented, in the form of KOHmodified multilayer graphene oxide paper (GO KOH). Such membranes can be easily fabricated at large scale with varying thickness using conventional filtration techniques, and have high tensile strength (24.5 MPa). However, a large degree of swelling is observed. SEM investigations show that the morphology of GO changes after KOH-treatment, whilst XPS measurements and XRD analysis confirm successful chemical modification. The hydrogen gas permeability is several orders of magnitude lower than conventional polymer-based ionomer membranes. The maximum anion conductivity is 6.1 mS/cm at 70°C, and the dominant charge carrier is confirmed to be OHby utilization of anion and proton-conducting blocking layers. The ion exchange capacity is 6.1 mmol/g, measured by titration. A water-mediated reverse Grotthuss-like mechanism is proposed as the main diffusion mode of OHions. Finally, a prototype AAEM fuel cell is fabricated using a GO KOH membrane, confirming the applicability to real systems.

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“…[18][19][20] Swelling of GO membranes is directly related to the size of "permeation channels" which enable diffusion of solvents and solutions. The interlayer distance of GO structures is typically studied using X-ray diffraction (XRD), 14,21,22 direct measurement of lm/membrane thickness 23 or quantitative evaluation of solvent vapor sorption. [24][25][26] Simultaneous evaluation of multilayered GO lm thickness and amount of sorbed solvent can be performed using Neutron Reectivity (NR) methods.…”

Section: Introductionmentioning

confidence: 99%