SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Ge Gao,Qiang Li,Hongjie Luo,Xiao Huang
Environmentally friendly humidity-sensitive color-changing materials have important applications in humidity indication. Two humidity-sensitive color-changing materials are prepared by utilizing bromocresol purple (BCP)/bromothymol blue (BTB) as humidity color-changing agents, boric acid as chromogenic agent and porous ceramic as substrate. To verify the repeatability and color-changing behavior of humidity-sensitive color-changing materials, a novel quantitative model of humidity is developed using hyperspectral imaging (HSI) and the K-nearest Neighbor (KNN) model. The two samples based on the KNN model can be achieved to match the measured values of ten humidity levels and show good repeatability after 35 cycles. The reflectance of two samples rapidly changed and stabilized within four minutes at a fixed humidity, which reflects their high humidity sensitivity . The predicted values of BCP sample based on KNN model are closer to the measured values of humidity levels in the range of 85–100% RH, while the predicted values of BTB sample based on KNN model are closer to the measured values of humidity levels in 7%− 23% and 85%− 100% RH range . Visualized assessment of humidity levels at each pixel can be obtained to provide a new approach to real-time monitoring of humidity changes , which shows potential applications in many areas.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Shihang Yan,Zhengrun Chen,Ya Wang,Jieqiang Wang,Hongyan Xu
For NO 2 , a gas that is widely used and harmful, domestic and foreign researchers have done a lot of work to develop a sensor with low detection limit and low humidity sensitivity to achieve efficient detection of NO 2 . In this work, first of all, dense and uniform SnO 2 nanosheets were grown in situ on the surface of Al 2 O 3 ceramic tube by hydrothermal method. Then, the ZIF-8@SnO 2 porous composite gas-sensitive material was constructed by solvent thermal method. With the advantages of the ZIF-8 porous screening framework, the permeation of different gases can be selectively controlled, and the adsorption efficiency of NO 2 gas can be enhanced through the modification of ammonia to improve the selectivity of NO 2 . The results show that the response of the Modified-ZIF-8@SnO 2 sensor is significantly enhanced, and the selectivity is greatly improved at low operating temperature. At 140 °C, the response of Modified-ZIF-8@SnO 2 to 50 ppm NO 2 gas is as high as 61, which is about 18.4 times higher than that of SnO 2 nanosheets and about 16.3 times higher than that of ZIF-8@SnO 2 . Meanwhile, the anti-interference ability of the Modified-ZIF-8@SnO 2 sensor to humidity has been improved. This work provides a new idea for improving the selectivity and humidity insensitivity of gas sensors.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 14
·5561-5566
·
IF 4.569
Qiu-Nan Yan,Bin-Wen Liu,Xiao-Ming Jiang,Jin-Xu Zhao,Shao-Min Pei,Wen-Fa Chen,Guo-Cong Guo
Copper chalcogenides have drawn considerable attention due to their prominent semiconducting properties. A new Cu-containing semiconductor, namely, CsCuS4 (1), was obtained by a halide salt flux method. Its structure featured 1D infinite ∞1[CuS4] − chains, where the polysulfide anion S42− was relatively rare in Cu chalcogenides. The compound was multifunctional and exhibited significant photocurrent, humidity sensitivity, and proton conductivity properties. Specifically, it exhibits an “on” state photocurrent response of 0.95 μA cm−2 and an “off” state photocurrent response of 0.55 μA cm−2 with good reversibility. The humidity-sensitive resistance in dry air (10% RH) could reach up to six orders of magnitude higher than that in wet air (100% RH). Compound 1 showed an activation energy of 0.19 eV and may have potential electrochemical applications.
研究领域:
材料科学
·
半导体物理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Songlin Li,Min Zhang,Zhaohui Lei,Jie Gao,Pengfei Cheng,Hai Wang
Water vapor causes the baseline resistance, response, recovery time, and long-term stability of the metal oxide semiconductor (MOS) gas sensors to change in different humidity. Combining first-principle and experimental can provide an in-depth understanding of the sensing mechanism from the atomic and molecular scales. In this work, we examined the humidity sensitivity of different concentrations of Ni-doped Co 3 O 4 in detail. Co 48 O 64 (1 1 0) and Co 48 O 64 (1 1 1) were constructed by HR-TEM and doped with single, double, and treble Ni atoms on both surfaces. We calculated the adsorption of water and n-butanol molecule on these eight surfaces. The results show that Ni doping improves the moisture resistance properties of Co 48 O 64 (1 1 0) and Co 48 O 64 (1 1 1), and the sensing properties of C 3 H 9 OH adsorbed on Ni 2 Co 46 O 64 (1 1 0) and Ni 2 Co 46 O 64 (1 1 1) are higher than single and treble Ni atoms doping. To investigate the humidity sensitivity further, we synthesized nanorods Co 3 O 4 with and without Ni doping. The experimental results showed that the humidity sensitivity of Ni-Co 3 O 4 was significantly lower than that of Co 3 O 4 . The decrease in the response value for the C 3 H 9 OH may be attributed to the change in the concentration of the Ni doping or the difference in the primarily exposed crystal facet.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2024
·
IF 9
Peicong Chen,Tingting Wu,Zhuohui Wu,Changhong Wang,Zijie Kong
The propagation of thermal runaway (TR) is a critical safety issue in lithium-ion battery modules, which can be mitigated by using aerogels, a new nano porous material with exceptional thermal insulating capabilities and flame resistance. In this study, we developed an environmentally friendly aerogel by combining chitosan (CS) and phytic acid (PA) through ambient pressure drying. The optimal PA composition was 5 wt%, and the corresponding aerogel achieved a limit oxygen index (LOI) value of 45.6 % and V-0 rate in UL-94 tests, demonstrating excellent flame retardancy. With a low density of 0.163 g/cm³, the aerogel exhibited a thermal conductivity of 0.0309 W/(m·K), making it an effective thermal insulator. The rigid porous structure of the composite aerogel provided a maximum compressive strength of 25.8 MPa and a compressive modulus of 5.58 MPa. To study the effect of the aerogel in mitigating TR, we simulated TR conditions by heating blocks to 300 °C. The aerogel significantly reduced the temperature rise in adjacent blocks, effectively inhibiting TR propagation. These findings indicate that the CS/PA aerogel offers superior thermal insulation, flame-retardant properties, and robust mechanical strength, making it a promising material for enhancing the safety of lithium-ion battery modules.
研究领域:
材料科学
·
能源安全
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiong Yu,Hao Li,Min Li,Xiaoyan Wen,Shuo Deng,Sisi Liu,Ming-Yu Li,Haifei Lu
MXenes with numerous superior properties have great potential for portable and conformal humidity sensing, which can meet the ever-increasing requirements for noncontact medical diagnosis, noninvasive epidermal detection, and environmental monitoring. Due to the ambiguous mechanism, the absence of an efficient approach for improving the sensitivity and selectivity remains a big obstacle for realization of MXene-based humidity sensing. In this work, the evolution of humidity sensing mechanisms of few-layered Nb2CTx nanosheets before and after self-oxidation in aqueous solutions are clarified depending on a systematic comparison. The evolution of structure and chemical bonds in few-layered Nb2CTx nanosheets after different incubation durations has been investigated to understand the in situ self-oxidation process and establish the relationship between the oxidation degree and humidity sensing performance. Meanwhile, the humidity sensing mechanism of sensors for different few-layered Nb2CTx nanosheets has been also clarified, and the humidity sensitivity has been optimized to −2.3 × 104 with a relative humidity of 53%. Compared with the sensor prepared from as-prepared few-layered Nb2CTx nanosheets, the humidity sensing selectivity from oxidized few-layered Nb2CTx nanosheets has been improved, contributed to by the transformation of the sensing mechanism from electronic conduction to ionic conduction. Finally, the oxidized few-layered Nb2CTx nanosheets have been prepared on a PI substrate to demonstrate its application in a flexible humidity sensor, providing a facile solution for ultrasensitive wearable gas sensing.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tianjun Xu,Rongchao Li,Tengfei Zhang,Yuhan Li,Hulin Zhang,Zhongyun Yuan,Kai Zhuo
In this study, gallium oxide hydroxide (GaOOH) nanorods were synthesized using a hydrothermal method, which was followed by a high-temperature nitriding process to synthesize gallium nitride (GaN) nanorods. Then, potassium chloride (KCl)-modified GaN nanorod composite materials were prepared using the physical mixing method. The analysis of the humidity sensitivity test demonstrated that the KCl/GaN nanorods with a KCl loading of 2.5 wt% exhibited the best humidity sensitivity, with a resistance change response of 36589.59 under 97% relative humidity (RH), which was 2.51 times that of pure GaN nanorods without KCl doping. The response and recovery times of the KCl/GaN-2.5- wt% nanorod humidity sensor in a 97%-RH environment were 3 s and 80 s, respectively. The response time did not exhibit considerable fluctuations compared with the undoped GaN nanorods, and the recovery time increased. The hierarchical morphology of the GaN nanorods created abundant adsorption sites for water molecules, while the incorporation of KCl enhanced the electrical conductivity of the composite material, thereby resulting in an increase in the magnitude of the resistance changes of the sensor in environments with different humidity conditions. The sensor also demonstrated excellent repeatability and long-term stability, making it suitable for applications in respiratory monitoring.
研究领域:
材料科学
·
电子工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenbo Zhang,Shihui Jiao,Weiming Sun,Yue Jiang,Shouhua Feng,Ming Yang
Living organisms employ a key strategy to construct resilient load-bearing structures: the strategic layering of anisotropic elements. Natural biomineralized tissues showcase a remarkable attribute—an exact alignment of multiple building units, a quality notably absent in contemporary biomimetic reproductions. We demonstrate the fabrication of artificial shells by integrating vertically aligned TiO 2 nanorods into a polymer matrix atop clay multilayers. This approach combines chemical synthesis with molecular assembly to mimic the bilayer structure of mollusk shells, which consists of polygonal prismatic units on a brick-and-mortar architecture. Our study reveals a critical design principle for artificial shells through a combination of nanoindentation and finite element analysis. This design minimizes stress concentration factors at the interface and enhances penetration resistance, mainly attributed to the properties of the bottom layer. In comparing our artificial shells with their natural counterparts, we uncover additional design principles, such as hierarchical architecture and microscale prism size. These artificial shells possess the intriguing ability to partially self-heal due to a dynamic hydrogen bonding network. Furthermore, they can serve as humidity-sensitive actuators , with bending direction controlled by the aspect ratios of clay nanosheets . Our work offers valuable insights for the rational design of multifunctional, multilayer materials with enhanced impact resistance.
研究领域:
材料科学
·
仿生学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Baoxia Wang,Jiangjun Zhou,Zixuan Wang,Shiling Mu,Rong Wu,Zhongkai Wang
The preparation of high-performance cellulose nanocrystals (CNCs)/plant oil-derived polymer composites is still a challenge, due to their poor compatibility. Here, by designing amide groups and epoxy groups on sunflower oil derived polymers, appropriate interfacial hydrogen bond interactions between the polymers and CNCs were constructed, where CNCs were homogenously dispersed in polymer matrix. Tensile tests and DMA results revealed that the incorporation of CNCs into sunflower oil derived epoxy polymers significantly enhanced the tensile strength and storage modulus. More importantly, nanocomposites with 50 wt% CNCs are still hydrophobic, which not only show a fast and reversible humidity induced modulus switch, but also exhibit high wet strength (19.9 MPa) after equilibrium water adsorption. The present work revealed that proper designed CNCs/plant oil polymer nanocomposites are good candidates for high performance and functional materials, which are able to replace petroleum-based materials in various fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Teng Li,Xueliang Zhang,Wei Yu,Sijun Liu
The rapid development of wearable devices and soft robotics has an urgent demand for polymer conductors with a switchable adhesion property. Herein, we report a supramolecular ionogel (SIG) that can reversibly switch between adhesion and debonding to various substrates. The on/off switchable adhesion of SIG is attributed to phase separation induced by the aggregation of polymer chains and the formation of a lubricating layer, which impairs the contact between polymer chains and substrates, thus weakening interfacial interaction. The phase separation ionogel (PSIG) is highly sensitive to humidity, leading to the debonded PSIG instantly transforming into the adhesion-hydrated ionogel (HIG) owing to the disruption of phase structure. Based on the switchable adhesion property, this multiresponsive ionogel shows potential applications as a fire alarm and intelligent conductive tape. This work provides a simple method for developing a switchable adhesion ionic polymer conductor and broadens the application of the ionogel in flexible devices.
研究领域:
材料科学
·
柔性电子
·
智能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 2
·027509
·
IF 3.1
Feng Shao,Shuohao Hu,Wanqing Huang,Xuhui Sang,Shangjian Liu,Xi Wan,Xiaofeng Gu
The electrolyte gating of transistors, which directly couples ion transport with electron conduction, is particularly interesting in the field of bio and chemical sensing. When a humidity-sensitive polyelectrolyte is used as the gate dielectric, the resulting ionotronic device becomes a humidity-sensitive transistor providing potential advantages in signal amplification and circuit integration. In this work, a humidity-sensitive polyelectrolyte-gated metal oxide transistor is reported by implementing the capacitive-to-resistive-based sensing mechanism. Due to the correlation between drain current and gate capacitance, the measurement of capacitance or impedance for humidity sensors is converted into the measurement of resistance. Initial sensing studies in the quasi-static DC sensing mode resulted in a limited sensing response. A pulsed sensing mode was proposed to considerably enhance the sensing response ID,80%RH/ID,20%RH to 861. The response in the specific RH range was also found to be tunable with the applied sensing signal. The underlying mechanism is elucidated with frequency-dependent capacitance and impedance analysis of the gate electrolyte using corresponding equivalent circuit model.
研究领域:
电子器件
·
化学传感器
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
J. Zhou,Y. Li,L. Xie,R. Xu,R. Zhang,M. Gao,W. Tian,D. Li,L. Qiao,T. Wang,J. Cao,D. Wang,Y. Hou,W. Fu,B. Yang,J. Zeng,P. Chen,K. Liang,B. Kong
The research and development of transient energy devices used to power implanted electronic is an emerging engineering field that has attracted increasing attention. This device not only requires the material and system design with excellent performance in routine operations but also can be degraded at a controlled rate once a specific task is completed. Herein, we report a transient, high-performance and formable yarn-like zinc-ion battery (ZIB) composed of a smart humidity-sensitive plasticized gelatin-silk fibroin electrolyte film and a dual-yarn electrode structure. This transient energy battery device exhibits a high specific capacity (311.7 mA h g −1 ) and excellent cycle stability (94.6% capacity retention after 100 cycles) due to the high ionic conductivity . More importantly, the yarn ZIB device also demonstrates superior shape plasticity (high capacity retention of 82.5% after 80 bends) and good biodegradability (fully degraded in 45 days under enzyme digestion). The successful design and fabrication of the ZIB battery system provide new research ideas for the development of transient energy devices in the future and bring new opportunities for multifunctional and green sustainable transient electronic products in the fields of medicine, national defense, flexible wearable, and consumer electronic products.
研究领域:
材料科学
·
生物医学工程
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）