Real-time and ultrasensitive humidity sensor based on lead-free Cs2SnCl6 perovskites

Pi, Mingyu; Wu, Daofu; Wang, Jian; Chen, Kai; He, Jie; Yang, Jie; Zhang, Dingke; Chen, Shijian; Tang, Xiaosheng

doi:10.1016/j.snb.2021.131084

Cited by 38 publications

(18 citation statements)

References 42 publications

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“…28 For these reasons, humidity sensors are critical to many fields of science, agriculture, and industry (e.g., automobile, medicine, pharmaceuticals, textiles, food textile, and paper production). 29,30 Conventional types of commercially available sensors are made from inorganic materials, such as alumina, 31 silica, 32 metal oxides, 31,33−35 perovskites, 36 and various ceramics, 29,33,37 which may also contain expensive components such as precious metals 38 or rare earth elements. 34 Therefore, the production, operating, and replacement cost of inorganic humidity sensors may be high, 30 especially for energy-intensive applications at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional types of commercially available sensors are made from inorganic materials, such as alumina, silica, metal oxides, ,− perovskites, and various ceramics, ,, which may also contain expensive components such as precious metals or rare earth elements . Therefore, the production, operating, and replacement cost of inorganic humidity sensors may be high, especially for energy-intensive applications at elevated temperatures .…”

Section: Introductionmentioning

confidence: 99%

“…The results reported herein represent the first example of a systematic study that details such types of ternary PANI-based composites, where renewable biopolymer platforms were used to prepare hybrid biocomposite materials. In comparison with conventional ceramic sensors, − ,, the hybrid biopolymer composites reported herein possess several advantages as sustainable humidity sensor materials, ,− according to selected sustainability metrics that are summarized in Table .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Anisimov

Evitts

Cree

et al. 2022

ACS Appl. Polym. Mater.

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The current study was focused on electrically conductive polyaniline (PANI)-based polymer composites and their films, which contain poly(vinyl alcohol) (PVA). The goal of this research was to evaluate PANI composites that contain biopolymer platforms (chitosan or cellulose micro-powder) as materials for humidity sensing, which were compared against composites that contain carbon nanofibers in lieu of the biopolymer. Ternary film materials were prepared by a two-step method: (1) in situ polymerization of PANI onto the biopolymer or carbon support to yield a binary composite, and (2) physical blending of the resulting binary composite with PVA to yield a ternary composite in a film form. The following mechanical properties were estimated: (a) elastic (Young’s) modulus and stiffness, (b) ductility and toughness, and (c) yield and tensile strength. The Young’s modulus improved as the chitosan fraction increased, which indicates that chitosan can be used as a mechanical reinforcement additive for PANI-based composites. The electrical properties were characterized by plots of electrical conductivity versus relative humidity, whereas mechanical properties were evaluated using tensile testing. Overall, chitosan-based films showed good mechanical properties, moderate electrical conductivity, and favorable high humidity response and moisture uptake. Cellulose- and carbon-based composites were generally inferior to chitosan for most properties, except for higher conductivity. Due to the high brittleness of carbon-based composites, the practical utility of carbon nanofibers for humidity sensing is limited in the case of pristine carbon materials. This work reveals that ternary PANI-based composites are potential candidates for humidity sensor materials, where moderate PANI-to-chitosan/cellulose/carbon ratios enable good moisture uptake and electromechanical properties of composites. PANI/biopolymer composites are a promising class of sustainable materials due to the ability to tailor their structure and properties, in contrast to conventional ceramic humidity sensor materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Anisimov

Evitts

Cree

et al. 2022

ACS Appl. Polym. Mater.

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“…causing ionization of water molecule (H ? ) [38]. With a further increase in humidity level (75%), the ionized H ?…”

Section: Humidity Sensing Performancementioning

confidence: 97%

Flexible humidity sensor based on light-scribed graphene oxide

Ouda

Yousf

Morsy

et al. 2022

J Mater Sci: Mater Electron

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The light scribe (LS) technique has been applied to reduce graphene oxide (LSGO) over a flexible substrate to be used as a humidity sensor. Graphene oxide (GO) suspension was drop casted over Polyethylene terephthalate (PET) substrate and then reduced inside a conventional light scribe digital video disc (DVD). Interdigitated electrode was precisely fabricated with dimensions of the finger length of 450 μm and width of 20 μm. The prepared material was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Raman spectroscopy. The results confirm the reduction process of GO using the LS technique. Moreover, the humidity sensing properties of the LSGO was evaluated. Results showed that the present light-scribed humidity sensor has many advantages including rapid response, highly precise due to light scribe technique, and more importantly sensors can be fabricated directly on flexible substrates which are highly favorable for future wearable smart electronics.

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“…To investigate the influence of pore size in the humidity sensor response, previously fabricated mesoporous thin films, with similar porosity and increasing pore size salt solutions [69][70][71], we utilized a humidity chamber, in which the environment (RH) is continuously controllable across the spectrum without the need to remove the benchmarked sensor between measurement steps. The described setup enabled us to acquire resistance data at over 30 points between 0.5% and 85% RH for in-depth analysis.…”

Section: Humidity Sensing Characteristics -Effect Of Pore Size On Dyn...mentioning

confidence: 99%

On the Rational Design of Mesoporous Silica Humidity Sensors

Füredi

Álvarez-Fernández

Fornerod

et al. 2023

Advanced Sensor Research

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Mesoporous silica is commonly used as matrix for humidity sensors, which operate on the principle of relative humidity-dependent water uptake and read-out by resistive or capacitive means. Although numerous studies have been dedicated to improving the sensing performance, the effect of pore structure on sensing behaviour has not been systematically investigated so far.Herein, we showcase the effects of pore size and porosity on resistive sensing behaviour in the 0.5-85% relative humidity (RH) range. We employed evaporation-induced self-assembly (EISA) in combination with sol-gel chemistry to fabricate well-defined mesoporous silica thin films with high degree of structural control. Material architectures with pore sizes of 3 to 15 nm and porosities of 40 to 70% were rationally designed by using structure directing agents (SDAs) with increasing molecular weight and tuning the silica to SDA ratio. We found that a combination of pore size of 15 nm and 70% porosity showcases a particularly high sensitivity (~10 4 times change in resistance) in the measured range, with quick response and recovery times of 3 and 9 seconds, respectively. Across the various sensors, we identified a clear correlation between the pore size and the linear RH sensing range. Additionally, increasing the porosity while retaining the pore size, yields better overall sensitivity across the range. Our findings may serve as guidelines for developing broad spectrum high-performance mesoporous sensors and for sensors specifically engineered for optimal operation in specific RH ranges.

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Real-time and ultrasensitive humidity sensor based on lead-free Cs2SnCl6 perovskites

Cited by 38 publications

References 42 publications

Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Flexible humidity sensor based on light-scribed graphene oxide

On the Rational Design of Mesoporous Silica Humidity Sensors

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