SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Changlin Xiao,Zihuan Tang,Zhuangzhuang Ma,Xiaotong Gao,Hongqiang Wang,Lichao Jia
Metal oxides based semiconductors promise high performance gas sensing owing to their robustness and low cost, but are limited by their unsatisfied adsorption ability and intrinsic low carriers' mobility. We herein demonstrate an efficient strategy of reducing the adsorption energy and improving the carrier mobility via bulk implanted TiO 2 nanocrystals (NCs) in LaFeO 3 porous structure . By implanting laser generated sub-3 nm TiO 2 NCs in LaFeO 3 samples, the response value (221.8 for 100 ppm formaldehyde) increases about 4 times comparing with that of pristine. Additionally, the sample exhibits high sensitivity and fast response/recovery speed toward formaldehyde steam. The detailed analyses and theoretical calculation proves that the TiO 2 NCs could cause the increase of adsorbed oxygen levels as well as the carrier mobility through forming the heterojunction with LaFeO 3 . This work verifies that TiO 2 NCs implanted LaFeO 3 is a promising formaldehyde sensing material, which provides a new approach to improve sensing ability of metal oxide semiconductor (MOS) based gas sensors.
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Aggregate
·
2023
·Vol. 4
·期 6
·e392
·
IF 18.8
Qiao-Xi Yu,Run-Xin Bei,Jia-Hui Liu,Yan-Wei He,Si-Wei Liu,Zhen-Guo Chi,Jia-Rui Xu,Yi Zhang
Flame retardants play a crucial role in improving the flame retardant properties of polymer materials. In recent years, environmental problems caused by flame retardants have attracted widespread attention. It is urgent to use green and effective methods to prepare flame retardant polymers. Bioinspired nanocomposites with layered structures seem to provide effective ideas, but in general, their hydrophilic raw materials limit their applications in certain fields. Here, we prepared biomimetic composites with a layered “brick-and-mortar” structure by gravity-induced deposition using polyimide as the polymer matrix and montmorillonite (MMT) as the filler. The well-arranged structures of the composite material could isolate oxygen and prevent combustible gases from escaping. The gas barrier performance has been greatly improved, in which the water vapor transmission rate and the oxygen transmission rate decreased by 99.18% and three orders of magnitude, respectively. The flame retardant performance has also been improved, and its limiting oxygen index can reach 67.9%. The polyimide matrix can be converted to water-insoluble by thermal imidization of water-soluble poly (amic acid) salt precursors, which endows the composites with low hygroscopicity. The coating containing MMT can protect against polyurethane (PU) foam from fire. During the conical calorimetric test, the coated sample self-extinguished, and the peak heat release rate, total heat release, and total smoke production are significantly decreased by 53.39%, 40.69%, and 53.03%, respectively. Taking advantage of these properties, this work utilizes a facile method to prepare biomimetic composites with low moisture absorption, excellent gas barrier properties, and flame retardancy, which have great application potential.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ke Wang,Fayong Li,Xiaoyan Sun,Feiyan Wang,Dong Xie,Yen Wei
It is of great significance to develop natural renewable polymer materials for different applications. Herein, the nano-sized hexagonal boron nitride nanosheets (hBNNSs) were facilely exfoliated through liquid-nitrogen, microwave, and ultrasonication treatments, and novel chitosan/hBNNSs (CS/hBNNSs) films were fabricated via solution casting. The obtained transparent CS/hBNNSs films demonstrated outstanding UV shielding ability with 98.51 % UV-A and 96.40 % UV-B lights being resisted. Compared to those properties of CS film, the oxygen permeability (OP) and carbon dioxide permeability (CO 2 P) of CS/hBNNSs films are significantly lowered by 96.35 % and 94.06 %, respectively, which are much better than CS/graphene oxide or other CS nanocomposite films. Moreover, the addition of hBNNSs in CS films also obviously improves their water vapor barrier ability, thermostability , mechanical properties, and antibacterial activity . The CS/hBNNSs films and the strategy developed in this work prove their great prospect in producing high-performance packaging films with desirable excellent UV shielding and oxygen barrier qualities.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Wang Feifei,Zhang Jipeng,Lu Haotian,Zhu Hanbing,Chen Zihui,Wang Lu,Yu Jinyang,You Conghui,Li Wenhao,Song Jianwei,Weng Zhe,Yang Chunpeng,Yang Quan-Hong
Aqueous zinc batteries are ideal candidates for grid-scale energy storage because of their safety and low-cost aspects. However, the production of large-format aqueous Zn batteries is hindered by electrolyte consumption, hydrogen gas evolution and accumulation, and Zn dendrites growth. To circumvent these issues, here we propose an “open” pouch cell design for large-format production of aqueous Zn batteries, which can release hydrogen gas and allow the refilling of the electrolyte components consumed during cell cycling. The cell uses a gel electrolyte containing crosslinked kappa (k)-carrageenan and chitosan. It bonds water molecules and hinders their side reaction with Zn, preventing electrolyte leakage and fast evaporation. As a proof-of-concept, we report the assembly and testing of a Zn | |Zn x V 2 O 5 ·nH 2 O multi-layer “open” pouch cell using the carrageenan/chitosan gel electrolyte, which delivers an initial discharge capacity of 0.9 Ah and 84% capacity retention after 200 cycles at 200 mA g ‒1 , 370 kPa and 25 °C.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 31
·e54113
·
IF 3
Bo Zhao,Li Guo,Mingze Han,Yunhong Liang,Mo Li,Shuli Ma,Tianjian Tong,Zhiyong Chang
In some harsh environments, certain gases are very important for the safety, such as methane gas from underground coal mines, which may explode causing catastrophic consequences. However, such gas detections are often disturbed by the particles. In this study, aiming at the scenario of underground coal mines, electrospun filters were developed and used as the pre-filter of electronic nose (PFEN) to mitigate the disturbance on gas detection in dusty environments. Two poly (ε-caprolactone) (PCL) filters and four poly (ε-caprolactone)/graphene oxide (PCL/GO) filters have been prepared and compared with two commercial filters. The results shows that all filters did not affect the response of sensors to the detecting gas as compared with that without filters. The PCL/GO filter at GO concentration of 0.03% (PCL/GO-3) had the best performance. The PCL/GO-3 filter exhibited high removal efficiency of particulate matter (PM) with 99.27% (PM 1 ), 99.67% (PM 2.5 ), and 99.90% (PM 10 ), low pressure drop of 75 Pa, and highest quality factor of 0.076 as compared with other filters. In addition, the PCL/GO-3 filter exhibited higher tensile strength than those of other electrospun filters and commercial filters. These results indicate that the electrospun filters can be excellent option to be used as PFEN for mitigating PM deposition for gas detection in dusty environments.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Keke Ma,Lu Zhou,Bai Yu,Yiying Xin,Zhi Cao,Heping Li,Chengyu Bao,Yuexi Zhou
In this study, gas–liquid phase non-thermal plasma in a needle-plate reactor was used to evaluate the generation of active species (·OH, H 2 O 2 , and O 3 ). Specifically, the effects of different factors, including initial pH, conductivity, gas flow rate, and solution circulation flow rate, on the generation of these active species were investigated. Tert-butanol (TBA) was chosen as the scavenger of ·OH given that formaldehyde is a specific product of their reaction. The results showed that the generation of ·OH and H 2 O 2 occurs at a faster rate in acidic solutions than in alkaline and neutral solutions. High-conductivity solutions hindered the generation of these active species, which were also affected by the electrolyte type. Further, oxygen and liquid circulation flow rates had little effect on ·OH and H 2 O 2 generation in aqueous solutions. However, they exerted a greater impact on ozone mass transfer in gas and liquid phases. Furthermore, the simulation of the effects of UV irradiation, H 2 O 2 oxidation, and ozone oxidation on the generation of these active species during discharge showed that individually, UV radiation and ozone oxidation had no significant effect on the generation of ·OH and H 2 O 2 . However, various combinations of these processes, especially UV/O 3 /H 2 O 2 and UV/O 3 , significantly enhanced ·OH production.
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Membranes
·
2023
·Vol. 13
·期 5
·461
·
IF 4.2
Yuxuan Zhao,Hongyan Wang,Xiangyun Liu,Xueping Zong,Jiangzhou Luo,Song Xue
The 6FDA-based network PI has attracted significant attention for gas separation. A facile strategy to tailor the micropore structure within the network PI membrane prepared by the in situ crosslinking method is extremely significant for achieving an advanced gas separation performance. In this work, the 4,4′-diamino-2,2′-biphenyldicarboxylic acid (DCB) or 3,5-diaminobenzoic acid (DABA) comonomer was incorporated into the 6FDA-TAPA network polyimide (PI) precursor via copolymerization. The molar content and the type of carboxylic-functionalized diamine were varied in order to easily tune the resulting network PI precursor structure. Then, these network PIs containing carboxyl groups underwent further decarboxylation crosslinking during the following heat treatment. Properties involving thermal stabilities, solubility,d-spacing, microporosity, and mechanical properties were investigated. Due to the decarboxylation crosslinking, thed-spacing and the BET surface areas of the thermally treated membranes were increased. Moreover, the content of DCB (or DABA) played a key role in determining the overall gas separation performance of the thermally treated membranes. For instance, after the heating treatment at 450 °C, 6FDA-DCB:TAPA (3:2) showed a large increment of about ~532% for CO2gas permeability (~266.6 Barrer) coupled with a decent CO2/N2selectivity~23.6. This study demonstrates that incorporating the carboxyl-containing functional unit into the PI backbone to induce decarboxylation offers a practical approach with which to tailor the micropore structure and corresponding gas transport properties of 6FDA-based network PIs prepared by the in situ crosslinking method.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Zhangjie Qin,Zhaofeng Wu,Qihua Sun,Jun Sun,Min Zhang,Talgar Shaymurat,Changwu Lv,Haiming Duan
Tens of billions of pairs of waste disposable bamboo chopsticks (DBC) are produced every year, and it is extremely important to utilize this resource effectively. Inspired by the structural similarity between the dog turbinate and bamboo, DBC were successfully carbonized into carbon materials with a similar structure to that of dog turbinate at different temperatures. The carbon materials derived from DBC were used gas sensors for the first time and the effect of carbonization temperature on the structures, carbon yield and gas sensing performance was studied. By optimizing the carbonization temperature, the biomimetic sensor realized the detection of ammonia (NH 3 ) with high sensitivity and selectivity, exhibited the high response (71.82 k%) to 500 ppm NH 3 at room temperature, and had a theoretical detection limit of 0.12 ppm. Furthermore, the biomimetic sensor showed excellent immunity to formaldehyde, acetone, relative humidity (RH) and other interference factors, and its response to 95% RH was less than one thousandth of that to 500 ppm NH 3 . Compared with the fresh sensor, after 50 days the fluctuation of the sensor's response to NH 3 was less than 4.2%, and it still had excellent recovery capability in 10 consecutive response-recovery cycles. What’s more, the biomimetic sensor has been successfully used to monitor the freshness of mutton in the actual environment. This study provides a reference for the development of low-cost and high-performance gas sensors and the effective utilization of biomass waste.
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Nanomaterials
·
2023
·Vol. 13
·期 5
·917
·
IF 5.3
Donglin Li,Junfeng Lu,Xuanji Zhang,Dingfeng Jin,Hongxiao Jin
Nanoscale heterostructured zinc oxide/reduced graphene oxide (ZnO/rGO) materials with p–n heterojunctions exhibit excellent low temperature NO2gas sensing performance, but their doping ratio modulated sensing properties remain poorly understood. Herein, ZnO nanoparticles were loaded with 0.1~4% rGO by a facile hydrothermal method and evaluated as NO2gas chemiresistor. We have the following key findings. First, ZnO/rGO manifests doping ratio-dependent sensing type switching. Increasing the rGO concentration changes the type of ZnO/rGO conductivity from n-type (<0.6% rGO) to mixed n/p -type (0.6~1.4% rGO) and finally to p-type (>1.4% rGO). Second, interestingly, different sensing regions exhibit different sensing characteristics. In the n-type NO2gas sensing region, all the sensors exhibit the maximum gas response at the optimum working temperature. Among them, the sensor that shows the maximum gas response exhibits a minimum optimum working temperature. In the mixed n/p-type region, the material displays abnormal reversal from n- to p-type sensing transitions as a function of the doping ratio, NO2concentration and working temperature. In the p-type gas sensing region, the response decreases with increasing rGO ratio and working temperature. Third, we derive a conduction path model that shows how the sensing type switches in ZnO/rGO. We also find that p–n heterojunction ratio (np–n/nrGO) plays a key role in the optimal response condition. The model is supported by UV-vis experimental data. The approach presented in this work can be extended to other p–n heterostructures and the insights will benefit the design of more efficient chemiresistive gas sensors.Keywords:p–n junctions;ZnO;reduced graphene oxide;rGO;NO2sensing
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yuanlong Guo,Yang You,Gu Guo,Zixiang Chen,Wei Peng,Lijie Hu,Songmiao Liang,Haibo Xie
Herein, a serial of full cellulose and lignosulfonate derivatives (LS), including sodium lignosulfonate (LSS), calcium lignosulfonate (LSC), lignosulfonic acid (LSA), composite films were generated through dissolving cellulose in reversible carbon dioxide (CO 2 ) ionic liquids solvent system (TMG/EG/DMSO/CO 2 solvent system), followed by a facile solution-gelation transition and absorption strategy. The findings indicated that LS aggregated and embedded inside the cellulose matrix via H-bond interaction. The cellulose/LS derivatives composite films showed good mechanical properties which the tensile strength reaches the maximum value of 94.7 MPa in MCC3LSS film. While for the MCC1LSS film, the breaking strain increases to 11.6 %. The outstanding UV shielding effect and high transmittance in the visible region of composite films were also achieved and the shielding performance of the whole UV region (200–400 nm) tended to 100 % for MCC5LSS film. In addition, thiol-ene click reaction was selected as model reaction to verify the UV-shielding performance. It was also found that the oxygen and water vapor barrier performances of composite films were evidently associated with the intense H-bond interaction and tortuous path effect. The OP and WVP of MCC5LSS film were 0 and 6 × 10 −3 g·μm/m 2 ·day·kPa, respectively. These outstanding properties make them with great potential for packaging field.
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Advanced Healthcare Materials
·
2023
·
IF 10
Hui Shi,Cheng-Feng Xiong,Lin-Jun Zhang,Hu-Chen Cao,Ru Wang,Pei Pan,Hai-Yan Guo,Tao Liu
The development of nanomedicines that combine photothermal therapy (PTT) with photodynamic therapy (PDT) is considered promising for cancer treatment, but still faces the challenge of enhancing tumoricidal efficiency. Fortunately, apart from the well-acknowledged effect on direct tumor cell-killing, nitric oxide (NO) is also considered to be effective for the enhancement of both PTT and PDT. However, both the low loading efficiency of NO precursor and the short half-life time and diffusion distance of NO hamper the synergistic therapeutic efficacy of NO. Taking the aforementioned factors into account, a mitochondria-targeted nitric oxide nanogenerator, EArgFe@Ce6, is constructed to achieve high loading of the NO donor l -Arginine ( l -Arg) for synergistic photodynamic/gas/photothermal therapy upon single 660 nm light irradiation. The coordination of epigallocatechin gallate (EGCG) and ferric ions (Fe 3+ ) provides EArgFe@Ce6 supreme photothermal capability to perform low-temperature PTT (mPTT). EGCG endows EArgFe@Ce6 with mitochondria-targeting capability and meanwhile favors hypoxia alleviation for enhanced PDT. The PDT-produced massive reactive oxygen species (ROS) further catalyzes l -Arg to generate a considerable amount of NO to perform gas therapy and sensitize both mPTT and PDT. In vitro and in vivo studies demonstrate that the synergistic photodynamic/gas/photothermal therapy triggered by single 660 nm light irradiation is highly effective for tumor treatments.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Changhao Feng,Zhongwei Jiang,Jingxuan Wu,Bin Chen,Geyu Lu,Chengzhi Huang
In this work, Pt-Cr 2 O 3 -WO 3 composite nanofibers have been designed by using Pt@MIL-101(Cr) and electrospinning. The morphological and microstructural properties of these nanofibers were analyzed by various kinds of techniques. The FESEM and TEM results demonstrate that the size of Pt nanoparticles is ˜ 3 nm, which greatly improved the gas sensing properties of metal oxides. The gas-sensing properties of WO 3 , Cr 2 O 3 -WO 3 and Pt-Cr 2 O 3 -WO 3 composite nanofibers were tested. Compared with pristine WO 3 nanofibers, Pt-Cr 2 O 3 -WO 3 composite nanofibers exhibit superior response toward xylene. At the optimal operating temperature of 325 °C, the response of Pt-Cr 2 O 3 -WO 3 composite nanofibers to 10 ppm xylene is 74.3, the response time is 5 s and the detection limit is 0.5 ppm. The sensing mechanism of the ultrahigh gas sensing properties attributes to the Cr 2 O 3 -WO 3 heterojunction, the catalytic activity of Cr 2 O 3 , porous structure, the electronic and chemical sensitization of Pt nanoparticles.
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