Luminescent probes attract increasing attentions for the unique superiorities like visually real-time detecting.However,for optical humidity sensing,it is still quite challenging to attain facile dehydration/activatio...Luminescent probes attract increasing attentions for the unique superiorities like visually real-time detecting.However,for optical humidity sensing,it is still quite challenging to attain facile dehydration/activation in sensing materials,due to the high polarity of water molecules,which limits their applications in real-time detection and energy-conserving applications.Here,we report two fluorescent hydrogen-bonded organic frameworks(HOFs),HPISF-H_(2)O and TPISF.HPISF-H_(2)O achieves water absorption in low humidity,but needs an energy-intensive step(heating to∼92◦C in air)to dehydrate.Conversely,despite only a hydroxyl group being replaced,TPISF cannot bind to H_(2)O at all.In other words,real-time detection is not readily achieved through straightforward molecular design.Therefore,we propose a cocrystallization strategy to adjust their water-binding capacity.As a result,the HOF cocrystals are adjusted to have both good H_(2)O absorptivity and very gentle desorbing operation without heating(dry gas blowing or vacuuming).Benefiting from this strategy,appreciable advantages for an effective humidity sensor are realized,including real-time detection(second-scale response/recovery)and distinguishing fluorescence variation.Efficient sensing across a broad relative humidity(RH)range(10.0%–80.0%)was further achieved.Moreover,the mechanistic insight of fluorescent sensing was ascertained through detailed analyses of structural transformation,spectroscopic data,and theoretical approach.展开更多
This paper reported the impedance-type humidity sensor based on Ti_(3)C_(2)T_(x)/g-C_(3)N_(4)nanomaterials which was fabricated on a flexible polyethylene terephthalate(PET)substrate.The scanning electron microscopy(S...This paper reported the impedance-type humidity sensor based on Ti_(3)C_(2)T_(x)/g-C_(3)N_(4)nanomaterials which was fabricated on a flexible polyethylene terephthalate(PET)substrate.The scanning electron microscopy(SEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS)measurements were used to demonstrate the successful synthesis and combination of Ti_(3)C_(2)T_(x)and g-C_(3)N_(4)nanomaterials.The performance of the humidity sensor was tested at room temperature.The experimental results showed that the Ti_(3)C_(2)T_(x)nanosheets with g-C_(3)N_(4)nanosheets endowed the humidity sensor with an ultra-high response,rapid response/recovery time,and negligible hysteresis.The complex impedance spectroscopy(CIS)and bode diagrams were used to further analyze the sensing mechanism of the Ti_(3)C_(2)T_(x)/g-C_(3)N_(4)humidity sensor.The Ti_(3)C_(2)T_(x)/g-C_(3)N_(4)humidity sensor can monitor skin humidity and high-humidity alarm,which demonstrates great potential applications in various fields.展开更多
1 Results Despite rapid progress in the development of resistive-type humidity sensors, the detection of low humidity is still a problem[1, 2]. In this study, poly(4-vinylpyridine) was crosslinked and quaternized with...1 Results Despite rapid progress in the development of resistive-type humidity sensors, the detection of low humidity is still a problem[1, 2]. In this study, poly(4-vinylpyridine) was crosslinked and quaternized with 1,4-bromobutane to form a polyelectrolyte humidity sensitive film on interdigitated gold electrodes, which was further coated with a layer of polypyrrole by a facile method of vapor phase polymerization process. The composite so prepared was characterized by UV-vis spectroscopy and scannin...展开更多
Detecting multiple parameters in salt spray environments is critical,as it significantly enhances the stability and reliability of real-time corrosion monitoring systems.However,current sensor strategies for detecting...Detecting multiple parameters in salt spray environments is critical,as it significantly enhances the stability and reliability of real-time corrosion monitoring systems.However,current sensor strategies for detecting salt spray parameters face challenges such as poor timeliness,short lifespan,and low detection accuracy.This work introduces a multi-parameter micro-nano sensor based on Micro-Electro-Mechanical Systems(MEMS)technology,which integrates temperature,humidity,and conductivity detection units.Through a systematic characterization of the sensor’s performance,the sensor demonstrates excellent linearity,ideal detection ranges,and satisfactory accuracies with detection accuracies of±0.1℃ for temperature,±2%RH for humidity,and±0.1 mS/cm for conductivity.This sensor offers a practical strategy for calculating the instantaneous corrosion rate of aircraft over the ocean.Additionally,based on the positive correlation between the three parameters and the liquid film thickness,a critical threshold determination method for the dynamic behavior of the sensor surface liquid film is further explored.This method macroscopically distinguishes the phase transition boundary between dry and wet states of the liquid film,offering a theoretical foundation for differentiated corrosion rate assessment and improved corrosion prediction accuracy.Highprecision monitoring of environmental parameters during long-term salt spray and atmospheric exposure experiments is achieved using a self-developed online testing system.Real-time data compensation is also provided to improve the sensor’s stability and accuracy.Consequently,the proposed high-precision,miniaturized,and massproducible multi-parameter sensor holds great promise as a competitive device for detecting salt spray environmental parameters in real-time corrosion monitoring systems for the aerospace field.展开更多
基金NSFC(21901189 and 22101211)Open Foundation of MOE Key Laboratory of Bioinorganic and Synthetic Chemistry(BISC2022A04)+1 种基金Municipal Science and Technology Bureau(Jiangke 2021-76)Scientific Research Ability Improvement Project of Key Discipline Construction from the Education Department of Guangdong Province(2022ZDJS027).
文摘Luminescent probes attract increasing attentions for the unique superiorities like visually real-time detecting.However,for optical humidity sensing,it is still quite challenging to attain facile dehydration/activation in sensing materials,due to the high polarity of water molecules,which limits their applications in real-time detection and energy-conserving applications.Here,we report two fluorescent hydrogen-bonded organic frameworks(HOFs),HPISF-H_(2)O and TPISF.HPISF-H_(2)O achieves water absorption in low humidity,but needs an energy-intensive step(heating to∼92◦C in air)to dehydrate.Conversely,despite only a hydroxyl group being replaced,TPISF cannot bind to H_(2)O at all.In other words,real-time detection is not readily achieved through straightforward molecular design.Therefore,we propose a cocrystallization strategy to adjust their water-binding capacity.As a result,the HOF cocrystals are adjusted to have both good H_(2)O absorptivity and very gentle desorbing operation without heating(dry gas blowing or vacuuming).Benefiting from this strategy,appreciable advantages for an effective humidity sensor are realized,including real-time detection(second-scale response/recovery)and distinguishing fluorescence variation.Efficient sensing across a broad relative humidity(RH)range(10.0%–80.0%)was further achieved.Moreover,the mechanistic insight of fluorescent sensing was ascertained through detailed analyses of structural transformation,spectroscopic data,and theoretical approach.
基金financially supported by the National Natural Science Foundation of China(Nos.51777215 and 52005147)the Special Foundation of Taishan Scholar Project。
文摘This paper reported the impedance-type humidity sensor based on Ti_(3)C_(2)T_(x)/g-C_(3)N_(4)nanomaterials which was fabricated on a flexible polyethylene terephthalate(PET)substrate.The scanning electron microscopy(SEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS)measurements were used to demonstrate the successful synthesis and combination of Ti_(3)C_(2)T_(x)and g-C_(3)N_(4)nanomaterials.The performance of the humidity sensor was tested at room temperature.The experimental results showed that the Ti_(3)C_(2)T_(x)nanosheets with g-C_(3)N_(4)nanosheets endowed the humidity sensor with an ultra-high response,rapid response/recovery time,and negligible hysteresis.The complex impedance spectroscopy(CIS)and bode diagrams were used to further analyze the sensing mechanism of the Ti_(3)C_(2)T_(x)/g-C_(3)N_(4)humidity sensor.The Ti_(3)C_(2)T_(x)/g-C_(3)N_(4)humidity sensor can monitor skin humidity and high-humidity alarm,which demonstrates great potential applications in various fields.
文摘1 Results Despite rapid progress in the development of resistive-type humidity sensors, the detection of low humidity is still a problem[1, 2]. In this study, poly(4-vinylpyridine) was crosslinked and quaternized with 1,4-bromobutane to form a polyelectrolyte humidity sensitive film on interdigitated gold electrodes, which was further coated with a layer of polypyrrole by a facile method of vapor phase polymerization process. The composite so prepared was characterized by UV-vis spectroscopy and scannin...
基金supported by the grant from the National Science Foundation of China(62271272)the Open Fund Project of Key Laboratory of Ocean Observation Technology,MNR(2023klootA09)sponsored by Ningbo Science and Technology Project(2022Z092).
文摘Detecting multiple parameters in salt spray environments is critical,as it significantly enhances the stability and reliability of real-time corrosion monitoring systems.However,current sensor strategies for detecting salt spray parameters face challenges such as poor timeliness,short lifespan,and low detection accuracy.This work introduces a multi-parameter micro-nano sensor based on Micro-Electro-Mechanical Systems(MEMS)technology,which integrates temperature,humidity,and conductivity detection units.Through a systematic characterization of the sensor’s performance,the sensor demonstrates excellent linearity,ideal detection ranges,and satisfactory accuracies with detection accuracies of±0.1℃ for temperature,±2%RH for humidity,and±0.1 mS/cm for conductivity.This sensor offers a practical strategy for calculating the instantaneous corrosion rate of aircraft over the ocean.Additionally,based on the positive correlation between the three parameters and the liquid film thickness,a critical threshold determination method for the dynamic behavior of the sensor surface liquid film is further explored.This method macroscopically distinguishes the phase transition boundary between dry and wet states of the liquid film,offering a theoretical foundation for differentiated corrosion rate assessment and improved corrosion prediction accuracy.Highprecision monitoring of environmental parameters during long-term salt spray and atmospheric exposure experiments is achieved using a self-developed online testing system.Real-time data compensation is also provided to improve the sensor’s stability and accuracy.Consequently,the proposed high-precision,miniaturized,and massproducible multi-parameter sensor holds great promise as a competitive device for detecting salt spray environmental parameters in real-time corrosion monitoring systems for the aerospace field.
