Quantitative and qualitative studies for real monitoring of interfacial molecular water

Mekawy, Moataz; Noguchi, Hidenori; Kawakita, Jin

doi:10.1016/j.jcis.2022.01.025

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…where A is the area of the sensor surface, and f 0 is the resonant frequency of quartz [11,43]. In this study, A equaled 0.196 cm 2 (5 mm disk), and f 0 equaled 20 MHz (∆m/∆f = 0.22 ng/Hz).…”

Section: Qcm and Electrical Sensor Measurementsmentioning

confidence: 99%

“…The performance of humidity sensors, e.g., their responsiveness to water vapor, can be enhanced through the use of humidity-sensitive nanomaterials [2][3][4][5], particularly in the form of films with large surface-to-volume ratios. Among the several types of humidity sensors, impedance-type ones are easily incorporated into conventional electronic circuits and have therefore been most widely studied and used in portable devices [6][7][8][9][10][11][12]. In our previous studies, insulator nanoparticles were used as humidity-sensitive materials to fabricate sensors exhibiting rapid exponential impedance changes in response to humidity variation [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Water Vapor Condensation in Nanoparticle Films: Physicochemical Analysis and Application to Rapid Vapor Sensing

Kano,

Kawakita,

Yamashita

et al. 2023

Chemosensors

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Nanomaterial-based humidity sensors hold great promise for water vapor detection because of their high sensitivity and fast response/recovery. However, the condensation of water in nanomaterial films remains unclear from a physicochemical perspective. Herein, the condensation of water vapor in silica nanoparticle films was physicochemically analyzed to bridge the abovementioned gap. The morphology of surface-adsorbed water molecules was characterized using infrared absorption spectroscopy and soft X-ray absorption spectroscopy, and the effect of RH on the amount of adsorbed water was observed using a quartz crystal microbalance. The adsorbed water was found to exist in liquid- and ice-like states, which contributed to high and low conductivity, respectively. The large change in film impedance above 80% RH was ascribed to the condensation of water between the nanoparticles. Moreover, RH alteration resulted in a colorimetric change in the film’s interference fringe. The obtained insights were used to construct a portable device with response and recovery times suitable for the real-time monitoring of water vapor. Thus, this study clarifies the structure of water adsorbed on nanomaterial surfaces and, hence, the action mechanism of the corresponding nanoparticle-based sensors, inspiring further research on the application of various nanomaterials to vapor sensing.

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Section: Qcm and Electrical Sensor Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water Vapor Condensation in Nanoparticle Films: Physicochemical Analysis and Application to Rapid Vapor Sensing

Kano,

Kawakita,

Yamashita

et al. 2023

Chemosensors

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“…Moreover, using sum frequency generation spectroscopy enabled us to reveal the nature of the interfacial water molecules based on the surface wettability of the sensors used. These experimental findings could be used to provide a promising evaluation methodology for the galvanic current arising due to stacked interfacial water molecules at different levels of RH that represents the ability to detect water either in vapor or liquid phases [139].…”

Section: Detection Of Water Vapor and Liquid On Sdfssmentioning

confidence: 99%

Recent Sensing Technologies of Imperceptible Water in Atmosphere

Mekawy

Kawakita

2022

Chemosensors

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Accurate detection and quantitative evaluation of environmental water in vapor and liquids state expressed as humidity and precipitation play key roles in industrial and scientific applications. However, the development of supporting tools and techniques remains a challenge. Although optical methods such as IR and LASER could detect environmental water in the air, their apparatus is relatively huge. Alternatively, solid detection field systems (SDFSs) could recently lead to a revolution in device downsizing and sensing abilities via advanced research, mainly for materials technology. Herein, we present an overview of several SDFS based sensing categories and their core materials mainly used to detect water in atmosphere, either in the vapor or liquid phase. We considered the governing mechanism in the detection process, such as adsorption/desorption, condensation/evaporation for the vapor phase, and surface attach/detach for the liquid phase. Sensing categories such as optical, chilled mirror, resistive, capacitive, gravimetric sensors were reviewed together with their designated tools such as acoustic wave, quartz crystal microbalance, IDT, and many others, giving typical examples of daily based real scientific applications.

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“…21,22 Moreover, we used electrochemical, gravimetric, and spectroscopic techniques to emphasize the response electrical properties, mass and nature of stacked water molecules within the interface of the MSC under a systematic RH controlled scheme. 23 This enabled us to have a wide detection range of MSC that can distinguish between condensed water droplets and adsorbed water molecules. 24 In addition, enhancing MSC's practical applicability using modication of its surface according to the heat capacity of the actual target object was carried out and the MSC output response showed a clear dependence on the variation in the cooling rate, as well as the vapour pressure.…”

Section: Introductionmentioning

confidence: 99%

Frost formation through super-cooled water within micron gap of galvanic coupled arrays

et al. 2022

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Quantitative and qualitative studies for real monitoring of interfacial molecular water

Cited by 13 publications

References 40 publications

Water Vapor Condensation in Nanoparticle Films: Physicochemical Analysis and Application to Rapid Vapor Sensing

Water Vapor Condensation in Nanoparticle Films: Physicochemical Analysis and Application to Rapid Vapor Sensing

Recent Sensing Technologies of Imperceptible Water in Atmosphere

Frost formation through super-cooled water within micron gap of galvanic coupled arrays

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