Noncontact sensing for water area scanning identification based on Ho2O3/GO humidity sensor

Guo, Chuanyu; Xin, Yuying; Liu, Yu; Na, Boyu; Meng, Weiqi; Zhang, Xianfa; Cheng, Xiaoli; Huo, Li-Hua; Wang, Tingting; Xu, Yingming

doi:10.1016/j.snb.2023.133683

Cited by 16 publications

(2 citation statements)

References 37 publications

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“…In addition, GO-based composites, such as poly(vinyl alcohol)-reinforced and toughened with poly(dopamine)-treated GO [26], graphene/carbon nanotubes [35] have been demonstrated with a rather limited range as humidity sensors. The addition of GO to metallic oxide was proven to improve the response and recovery times to achieve 0.2/1 s response /recovery times for Ho 2 O 3 /GO composites [36].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Sensitive and Fast Humidity Sensors Based on Direct Laser-Scribed Graphene Oxide/Carbon Nanotubes Composites

Al‐Hamry

Chen

et al. 2023

Nanomaterials

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In this paper, the relative humidity sensor properties of graphene oxide (GO) and graphene oxide/multiwalled nanotubes (GO/MWNTs) composites have been investigated. Composite sensors were fabricated by direct laser scribing and characterized using UV-vis-NIR, Raman, Fourier transform infrared, and X-ray photoemission spectroscopies, electron scanning microscopy coupled with energy-dispersive X-ray analysis, and impedance spectroscopy (IS). These methods confirm the composite homogeneity and laser reduction of GO/MWNT with dominant GO characteristics, while ISresults analysis reveals the circuit model for rGO-GO-rGO structure and the effect of MWNT on the sensor properties. Although direct laser scribing of GO-based humidity sensor shows an outstanding response (|ΔZ|/|Z| up to 638,800%), a lack of stability and repeatability has been observed. GO/MWNT-based humidity sensors are more conductive than GO sensors and relatively less sensitive (|ΔZ|/|Z| = 163,000%). However, they are more stable in harsh humid conditions, repeatable, and reproducible even after several years of shelf-life. In addition, they have fast response/recovery times of 10.7 s and 9.3 s and an ultra-fast response time of 61 ms when abrupt humidification/dehumidification is applied by respiration. All carbon-based sensors’ overall properties confirm the advantage of introducing the GO/MWNT hybrid and laser direct writing to produce stable structures and sensors.

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Section: Introductionmentioning

confidence: 99%

Ultra-Sensitive and Fast Humidity Sensors Based on Direct Laser-Scribed Graphene Oxide/Carbon Nanotubes Composites

Al‐Hamry

Chen

et al. 2023

Nanomaterials

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“…The sensitivity of humidity sensors can be enhanced by altering the electrode coating material, thereby modifying the mass of water molecules adsorbed on the QCM's surface and enabling the fabrication of humidity sensors with higher sensitivity. In the past few years, a rising number of researchers have been exploring hydrophilic materials [18] or incorporating other micro-particles into humidity-sensitive materials at the microstructural level to enhance the adsorption capacity of the materials for water molecules [12,16,19,20].…”

Section: Introductionmentioning

confidence: 99%

Nanochitin/MXene Composite Coated on Quartz Crystal Microbalance for Humidity Sensing

Li,

Huang,

Chen

et al. 2023

Nanomaterials

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MXenes, as a typical graphene-like material, excels in the realm of humidity sensing owing to its two-dimensional layer structure, high electrical conductivity, tunable chemical properties, hydrophilicity, and large specific surface area. This study proposed a quartz crystal microbalance (QCM) humidity sensor using a nanochitin/Ti3C2Tx MXene composite as a humidity-sensing material. The morphology, nanostructure, and elemental composition of nanochitin, Ti3C2Tx MXene, and nanochitin/Ti3C2Tx MXene composite materials were characterized using transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Compared to the pure Ti3C2Tx MXene-coated QCM humidity sensor, the nanochitin/Ti3C2Tx MXene-coated QCM humidity sensor exhibited a higher sensitivity (20.54 Hz/%RH) in the humidity range of 11.3% to 97.3%. The nanochitin/Ti3C2Tx Mxene-coated QCM humidity sensor also demonstrated low humidity hysteresis (2.12%RH), very fast response/recovery times (4.4/4.1 s), a high quality factor (37 k), and excellent repeatability and sustained stability over time. Eventually, a bimodal exponential kinetics adsorption model was utilized for the analysis of the response mechanism of the nanochitin/Ti3C2Tx MXene composite material-based QCM humidity sensor. This study provides new ideas for optimizing the moisture-sensitive performance of MXene-based QCM humidity sensors.

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Advanced flexible humidity sensors: structures, techniques, mechanisms and performances

Zhang,

Liu,

Lin

et al. 2023

Front. Mater. Sci.

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Noncontact sensing for water area scanning identification based on Ho2O3/GO humidity sensor

Cited by 16 publications

References 37 publications

Ultra-Sensitive and Fast Humidity Sensors Based on Direct Laser-Scribed Graphene Oxide/Carbon Nanotubes Composites

Ultra-Sensitive and Fast Humidity Sensors Based on Direct Laser-Scribed Graphene Oxide/Carbon Nanotubes Composites

Nanochitin/MXene Composite Coated on Quartz Crystal Microbalance for Humidity Sensing

Advanced flexible humidity sensors: structures, techniques, mechanisms and performances

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