MOLECULES
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2024
·Vol. 29
·期 7
·1657
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IF 4.2
Huiting Peng,Yiping Liu,Yinfeng Shen,Ling Xu,Jicun Lu,Ming Li,Hong-Liang Lu,Liming Gao
Efficient sensors for toluene detecting are urgently needed to meet people’s growing demands for both environment and personal health. Metal oxide semiconductor (MOS)-based sensors have become brilliant candidates for the detection of toluene because of their superior performance over gas sensing. However, gas sensors based on pure MOS have certain limitations in selectivity, operating temperature, and long-term stability, which hinders their further practical applications. Noble metals (including Ag, Au, Pt, Pd, etc.) have the ability to enhance the performance of MOS-based sensors via surface functionalization. Herein, ZnO nanoflowers (ZNFs) modified with bimetallic AuPt are prepared for toluene detection through hydrothermal method. The response of a AuPt@ZNF-based gas sensor can reach 69.7 at 175 °C, which is 30 times, 9 times, and 10 times higher than that of the original ZNFs, Au@ZNFs, and Pt@ZNFs, respectively. Furthermore, the sensor also has a lower optimal operating temperature (175 °C), good stability (94% of previous response after one month), and high selectivity towards toluene, which is the result of the combined influence of the electronic and chemical sensitization of noble metals, as well as the unique synergistic effect of the AuPt alloy. In summary, AuPt@ZNF-based sensors can be further applied in toluene detection in practical applications.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Ruilong Ma,Wenchao Gan,Yuanhu Zeng,Shuanglong Feng,Shukai Duan,Peter Feng,Xiaoyan Peng
The demand for gas sensors is experiencing rapid growth, driven by the increasing need for air quality detection in the face of environmental pollution and industrial emissions. However, the widely used metal oxide semiconductor (MOS) gas sensors suffer from drawbacks such as low ability to predict gas concentration and poor selectivity . In this work, a sensor array was fabricated consisting of 10 various gas sensors and combined with an advanced deep learning algorithm to achieve precise predictions of nitrogen dioxide (NO 2 ) at low concentrations. First, graphitic carbon nitride (g-C 3 N 4 ) and In 2 O 3 nanoparticles were composited with different mass ratios, resulting in the formation of distinct g-C 3 N 4 /In 2 O 3 composites as sensing materials. Afterward, SEM, TEM , and XRD were employed to characterize the morphology, structure, and elemental composition of the samples. Furthermore, sensing properties including response, selectivity , and repeatability, are studied for 10 gas sensors based on g-C 3 N 4 /In 2 O 3 composites. Finally, the convolutional neural network-efficient channel attention-gate recursive unit (CNN-AGRU) model was proposed to analyze the patterns of the signals collected from the sensor array when exposed to various NO 2 concentrations from 1 to 9 ppm. The results demonstrated the integration of high-selectivity sensing materials to NO 2 and an advanced deep learning algorithm CNN-AGRU enables to realize a high concentration prediction accuracy of about 97.04% and a low prediction error of 0.20527 ppm for NO 2 gas.
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NEW JOURNAL OF CHEMISTRY
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2025
·
IF 2.5
Lu Wang,Lijuan Wang,Ziyang Cui,Yiqun Zhang
In order to achieve high sensitivity in gas-sensors based on organic field-effect transistors (OFETs), the most crucial and direct approach to enhance their sensing performance and reduce response and recovery times was through appropriate modification or improvement of the organic semiconductor (OSCs) layer, such as altering its surface morphology or structure. The micro/nano structure of spin-coated copper phthalocyanine (CuPc) films was controlled by utilizing polyvinyl alcohol ordered nanofibers (PVA ONFs). The electrical and gas-sensitive properties of CuPc/PVA ONFs films were investigated and analyzed. The CuPc/PVA ONFs film transistors exhibited improved output and transfer characteristics when the CuPc solution concentration was 75 mg/mL, with a mobility (μ) of 6.90 × 10-4 cm2/Vs. Compared with the spin-coated CuPc film transistors, the mobility increased by 74.24%. The sensors demonstrated the relative response of 12,942 % to 20 ppm NO2 gas. Additionally, it showed the response time of 1.49 min and recovery time of 2.32 min. The response rate reached up to 90 %, while the sensitivity was measured at 611 %/ppm, and the limit of detection (LOD) stood at 0.2 ppm. The research presented in this paper advances the potential applications of phthalocyanine materials within the realm of flexible and 3D-printed sensing technologies.
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VACUUM
·
2024
·
IF 3.8
Na Liu,Weiyi Bu,You Zhou,Yan Zhang,Xiaohong Chuai,Geyu Lu
Metal-organic frameworks (MOF)-derived materials have been a research hotspot in the field of gas sensor. In this work, the MOF-derived spindle-like In 2 O 3 mixed with the ZIF-67 was calcined to obtain xCo-In (x = 0.03, 0.05, 0.07) sensing composite materials. Various characterization techniques, such as XRD, SEM, TEM, UV–vis and XPS were adopted to analyze their crystalline structures, detailed morphology structures, texture properties, bandgap width and element valence states. For In 2 O 3 /Co 3 O 4 composites, their sensing properties for acetone are greatly improved compared with pure In 2 O 3 , and the response of 0.05Co-In to 100 ppm acetone can reach 226.1 at an operating temperature of 175 °C with a response time of 1 s In 2 O 3 /Co 3 O 4 composites remained the morphologies of MOF templates, exhibiting large specific surface area. Combining the gas-sensitive behavior with characterization results, the effect of heterojunction between In 2 O 3 and Co 3 O 4 is discussed. Their interface interaction increases the ratio of Co 2+ /Co 3+ , content of oxygen vacancy/adsorbed oxygen, and material resistance, being important reasons for the improved sensing performance. The prominent interface effect may originate from Co 3 O 4 which has the variable valence ion. This work provides a strategy for constructing heterojunction to achieve a high-performance gas sensor.
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Materials Research Express
·
2024
·
IF 1.8
Pu Shi,Zhikun Wang,Fan Shi
The catalytic properties of noble metal nanoparticles can enhance the adsorption capacity of sensors for target gases when compounded with MXene. In this study, a nanocomposite of gold nanoparticles (Au NPs) and MXene was prepared using a simple self-reduction process, and its microstructure, electrochemical valence states, specific surface area, and other properties were characterized. Gas sensitivity tests conducted on the Au@MXene-20 sensor revealed excellent selectivity for NH3 at room temperature. The response value to 100 ppm NH3 at room temperature was 15.1%, approximately three times that of pure MXene, with response and recovery times of 118 s and 219 s, respectively. Moreover, the composite sensor exhibited a low detection limit, demonstrating a response of 3.496% to 5 ppm NH3 at room temperature. Additionally, the Au@MXene-20 sensor possessed good repeatability, long-term stability, and moisture resistance. Therefore, the Au@MXene-20 sensor studied and prepared in this paper has been proven to be well-suited for NH3 detection in harsh environments.
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TALANTA
·
2024
·
IF 5.6
Tao Sun,Yanli Song,YuanYuan Zhang,Mengyi Ba,Wen Li,Zhiqiang Cai,Shaoqiang Hu,Xianming Liu,Shusheng Zhang
Pillar[ n ]arenes (P[ n ]A, n = 5–10) have attracted much attention because of their highly symmetric pillar-shaped architecture with π -electron rich cavity. Nevertheless, the use of ionic liquid functionalized P[ n ]A in chromatography has not been reported up to data. This work reports the investigation of the imidazolium ionic liquids functionalized pillar[6]arene (P6A-C10-IM-C8[NTf 2 ]) as the stationary phase for gas chromatography (GC). The statically coated P6A-C10-IM-C8[NTf 2 ] column (0.25 mm i.d.) showed moderate polarity and high column efficiency of 4733 plates/m determined by n -dodecane at 120 °C ( k = 2.29). Owing to its unique amphiphilic conformation, the P6A-C10-IM-C8[NTf 2 ] showed good column inertness and resolving capability for a wide range of analytes and isomers. Particularly, the P6A-C10-IM-C8[NTf 2 ] column exhibited distinctly advantageous performance for the challenging isomers of halogenated benzenes, benzaldehydes, phenols and anilines over the common commercial columns, namely 5% phenyl methyl polysiloxane (HP-5) and 35% phenyl methyl polysiloxane (HP-35). In addition, it exhibited good column repeatability and reproducibility with RSD values on the retention times less than 0.05% for run-to-run, 0.38% for day-to-day and 2.94% for column-to-column, respectively. This work demonstrates the promising future of ionic liquid P[ n ]A stationary phases for chromatographic separations.
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Tongxin Xiao,Xige Wu,Hongbao Liang,Kangyue Qiao,Ying Chen
Solar-powered photocatalytic conversion of CO2 into green solar fuels is one of the effective ways to solve the global energy crisis and the greenhouse effect. A new artificial photosynthesis system composed of TiO2 nanotube arrays (TiO2NTs) and bimetallic porphyrin was fabricated, and their photocatalytic activities were evaluated by the reduction of gas-phase CO2 to CH4 under simulated solar irradiation. Compared to pure TiO2NTs and CoTCPP/TiO2NTs, bimetallic porphyrin-sensitized TiO2NTs displayed greatly ameliorated photocatalytic activity. Among them, Ni-CoTCPP/TiO2NTs exhibited the highest photoreduction efficiency, and the reduction rate of CO2 into CH4 was up to 52.27 μmol/cm2/h with the quantum efficiency of 1.002%, about 7 times higher than that of pure TiO2NTs. The increase in photocatalytic performance can be attributed to the enhancement of the light absorption capacity of Ni-CoTCPP/TiO2NTs and the higher charge separation efficiency. Furthermore, according to the results of the photocatalytic evaluation and photo(electro)chemical studies, a possible mechanism of CO2 photoreduction over Ni-CoTCPP/TiO2NTs was proposed.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yongchao Sun,Zeyuan Gao,Lu Bai,Tianyou Li,Fangxu Fan,Fake Sun,Yijun Liu,Jianyu Guan,Gaohong He,Canghai Ma
Membrane technology holds the potential to significantly improve energy-efficient industrial processes, fostering a more sustainable green economy. However, overcoming the challenges of gas permeability-selectivity tradeoffs and CO 2 induced plasticization in gas separation materials remains a critical focus. This study presents a functionalization method for Trӧger's base (TB) based polymers by modifying them with phosphoric acid to create hydrogen bonds within the membrane structure. This approach enables ultra-high gas selectivity for multiple gas pairs, including H 2 /CH 4 , H 2 /N 2 , and O 2 /N 2 . The crosslinked membranes display H 2 and O 2 permeability of 248.0 and 27.9 Barrer, respectively, with H 2 /CH 4 , H 2 /N 2 , and O 2 /N 2 selectivity of 202.1, 115.7 and 10.0, respectively, exceeding the 2008 Robeson upper bounds for these gas pairs. Moreover, the crosslinked membranes demonstrate excellent anti-plasticization properties, withstanding pressures up to 600 psi in high-pressure CO 2 feed tests. These results suggest that the hydrogen bonds formed between the TB polymer and phosphoric acid in the membranes effectively mitigate polymer chain swelling. This design approach presents a promising pathway to developing membrane materials with enhanced performance for energy-efficient gas separation processes.
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iScience
·
2025
·
IF 4.1
Kaiyun Zhang,Lei Yu,Laiqiang Qu,Na Hui,Li Chen,Jiameng Wang,Hong Yan
Microplastics (MPs), an emerging global pollutant, pose potential risks to human health and have garnered increasing attention. Previous research has identified MPs in various human tissues and organs, but not in the aqueous humor of the eyes. This study used pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) to explore MPs in aqueous humor. Five types of MPs—polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polyamide 66 (PA66), and polystyrene (PS)—were found, with PE and PVC being most common. PP was more prevalent in children, while PA66 was more common in adults. MPs abundance generally followed the trend: adults > children > elders among age groups, and females > males between gender groups. Notably, this study is the first to confirm MPs in human aqueous humor, providing a foundation for future research on their impact on intraocular health and enhancing our understanding of the MPs’ body distribution.
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JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 54
·期 1
·348-360
·
IF 2.2
Zhou Mincong,Li Xu,Wang Qingji
Unique nanostructures contribute to optimizing gas-sensitive properties, which has been widely acknowledged in the field of gas sensing. However, the construction of nanostructures by the in situ method is still challenging. In this work, nanorod-assembled SnWO 4 was fabricated directly on interdigital electrodes by a one-step aerosol-assisted chemical vapor deposition method. The xylene gas sensor was developed, featuring low detection limits and fast response. Under the operating temperature of 350°C, the detection limit of the SnWO 4 sensor for xylene reaches a minimal level of 10 ppb. Meanwhile, the sensor exhibits excellent performance in response time, providing a rapid response of 2 s to 100 ppm xylene. Apart from this, the sensor also exhibits good selectivity. Among various volatile organic compound gases of the same 100 ppm at 350°C, the sensor’s response to xylene (484%) is 3.6 times that of toluene and 5.3 times that of benzene. The excellent gas-sensing performance is primarily due to the unique structural properties of nanorod-assembled SnWO 4 . This paper holds significant research potential in the field of gas sensing, particularly for the development of high-performance xylene sensors. Graphical
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhanbo Guo,Chao Feng,Zongnan Shen,Xun Deng,Xinrong Feng,Min Deng,Jie Liu,Wenju Jiang,Lin Yang,Lu Yao,Zhongde Dai
Membranes have been considered as promising alternatives for natural gas sweetening. Mixed matrix membranes (MMMs) possess superior gas separation performance and the potential to combine varieties of polymers and filler materials. In the current work, MMMs have been fabricated via employing Tröger’s base (TB) polymer and zeolites with three different morphologies. Simultaneously, CO2/CH4 and H2/CH4 separation performances of the obtained MMMs were comprehensively investigated. It is found out that the presence of the MFI-type zeolites significantly improved the gas permeability, but the selectivity was somehow reduced. Among the three different nanofillers, nanosheet zeolite-based MMMs presented the highest gas permeability; with 20 wt % nanosheet zeolites, both CO2 and H2 permeabilities were increased to 348.6 and 441.5 Barrer, which were improved by 522.0 and 256.2%, respectively. In addition, SEM, XRD, FTIR, and TGA were also employed to characterize the obtained MMMs.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Shuwen Peng,Yuran Li,Bin Wang,Yanbin Cui,Jinglei Tian,Hongqiang Liu,Tingyu Zhu
Removal of sulfur species from blast furnace gas is urgently needed due to the strict emission limits imposed on iron-steel industrial flue gas. Improving the sulfur capacity of H 2 S is a crucial challenge to reduce the operation cost. NiFe layered double hydroxide (LDH) adsorbents were synthesized using the hydrothermal method to strengthen the adsorption of H 2 S, achieving a high sulfur capacity of 133.6 mg/g at 50 °C. Characterization studies have revealed that the reaction pathway of H 2 S on the NiFe LDH surface involves adsorption, dissociation and oxidation. It has been clarified that the high sulfur capacity can be attributed to the abundant H 2 S dissociation sites and the excellent O 2 activation sites. The dissociation sites of H 2 S encompass metal sites, -OH and CO 3 2- . The interaction between O 2 and the bridge site of asymmetric metal atoms significantly enhances the dissociation of O 2 . Strengthening the dissociation of H 2 S and O 2 improves the sulfur capacity. The deactivation of adsorbents comes from the continuous consumption of oxygen species mainly composed of -OH and the deposition of sulfur species in the smaller mesopores ranging from 2 to 10 nm. This work provides useful insights into designing highly efficient iron-based adsorbents for the desulfurization of blast furnace gas.
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