SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Xinyu Li,Tao Zhang,Ying Chen,Ming Li,Haitao Yu,Pengcheng Xu,Xinxin Li
High-performance catalysts are crucial for many applications, including high-performance gas sensors. However, the catalysts used in gas sensors need to be screened through many experimental measurements, which is time-consuming and labor-intensive. Herein, the catalytic activity of ZSM-5 zeolites with different Si/Al ratios is quantitatively evaluated using a resonant microcantilever that enables in-situ temperature-programmed desorption (cantilever-TPD) measurements. Since the frequency shift obtained by the cantilever-TPD measurement is proportional to the number of probe molecules, the cantilever-TPD experiment can successfully measure the number of active sites and desorption activation energy of the catalyst. Therefore, the cantilever-TPD experiment quantitatively characterizes the catalytic activity through the comprehensive analysis of the number of active sites and the desorption activation energy, eliminating the need for the traditional trial-and-error method to study the gas-sensing performance. According to the test results of cantilever-TPD, the ZSM-5 zeolite with satisfactory performance is preferred as the catalytic material, and the ZnO/ZSM-5 double-layer sensor is made to detect trace amounts of the greenhouse gas Freon R134a. The gas sensing results show that the optimized ZSM-5 sensor has good sensitivity, limit of detection (LOD), repeatability, and selectivity, fully confirming the evaluation results of the cantilever-TPD.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-13
·
IF 5.3
Zhao Zhihua,Su Zijie,Lv Zhenli,Shi Pu,Jin Guixin,Wu Lan
Bi 2 S 3 /Ti 3 C 2 T x nanomaterials were successfully prepared through a simple hydrothermal method. Various methods were used for their characterization, including XRD, XPS, SEM, EDS, and BET, along with testing their gas-sensing properties. The results showed that the response value to 100 ppm ammonia at room temperature reached 107%, which was 14.1 times higher than that of pure few-layer MXene. After undergoing anti-humidity interference testing, we observed that Bi 2 S 3 /Ti 3 C 2 T x exhibited a higher response value in real-time monitoring of ammonia as humidity increased. Specifically, under 90% humidity conditions, its response value reached 1.32 times that of normal humidity conditions. This exceptional moisture resistance ensures that the sensor can maintain stability, and even exhibit superior performance, in harsh environments. Therefore, it possesses excellent selectivity, high-moisture-resistance, and long-term stability, making it significant in the field of medical and health monitoring. Graphical abstract
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Fan Liu,Wenbo Li,Yuan Liang,Xianhua Zhang,Dongxiao Ji,Hengtao Liang,Mengyu Yuan,Yanchao Zhao,Haozhe Tang,Xiang Li,Jianxin He,Weili Shao
Functional materials that can quickly absorb and degrade mustard gas are essential for chemical warfare emergency response kits. In this study, a fiber membrane with excellent adsorption and catalytic degradation activity was developed by solution blow spinning polystyrene (PS)/polyurethane (PU) and hydrothermal in situ growth of a zirconium-based MOF (MOF-808). The mechanical properties of the PS/PU fibers were improved by adding a trimethylolpropane tris (2-methyl-1-aziridine propionate) (TTMA) cross-linking agent. Moreover, the C═O bonds in TTMA provided abundant growth sites for MOF-808 in the hydrothermal process, thereby greatly increasing the loading capacity. The fiber surface was completely covered with the MOF-808 particles within 24 h. The PS/PU/TTMA/MOF-808 fiber membrane was used for the catalytic degradation of 2-chloroethyl ethyl sulfide (CEES). The degradation efficiency reached 97.7% after 72 h, indicating its great application potential in emergency wiping cloths for mustard gas adsorption and degradation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Kaihua Li,Yuchao Ma,Wei Zhao,Leixin Yang,Jinwei Zhang,Qian Zhang,Xiaohua Ma,Long Jiao,Zhen Yin,Bowen Cheng
The challenges of trade-off effect and long-term stability pose huge obstacles in the application of polymer-based gas separation membranes. In this study, we proposed a novel strategy to overcome these problems by in-situ thermally treating ZIF-8/polyimide mixed-matrix membranes (MMMs) at 300 °C. After thermally treatment, the T-ZIF-8 produced some unsaturated Zn site as defects that decreased BET surface area and the shrunk of micropore size as compared with ZIF-8. The MMMs with T-ZIF-8 significantly affects their gas separation performance and long-term stability, in which, the H 2 /CH 4 and CO 2 /CH 4 separation performance of T-ZIF-8/PI(3:10) and T-ZIF-8/PI(6:10) increased from far below the 2008 trade off lines for their PI matrix to approach or even above that. Additionally, both higher permeability and selectivity were observed for T-ZIF-8/PI(6:10) as compared with its precursor for H 2 /CH 4 separation, which was contributed by its higher H 2 diffusion coefficient (3834 vs 580 × 10 -8 cm 2 s −1 ) and H 2 /CH 4 diffusion selectivity (240 vs 154). Furthermore, the T-ZIF-8/PI (1:10) and T-ZIF-8/PI(3:10) MMMs demonstrate less than 15 % H 2 decreasing after 150 days, which is much better than that of the pristine PI membrane (26.7 %). These results probably contributed by the defected ZIF-8 loading induced extra ultra-micropore that caused size sieving effect and strong interaction with polyimide matrix that formed more rigid polymer chains. These findings propose a strategy to effectively enhance the gas separation performance and long-term stability by in-situ introducing the defect MOF in the polymer matrix.
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ACS Sensors
·
2024
·
IF 8.2
Haipeng Dong,Xiaowei Li,Yu Liu,Wanying Cheng,Xinghua Li,Dongxiao Lu,Changlu Shao,Yichun Liu
Wearable gas sensors have drawn great attention for potential applications in health monitoring, minienvironment detection, and advanced soft electronic noses. However, it still remains a great challenge to simultaneously achieve excellent flexibility, high sensitivity, robustness, and gas permeability, because of the inherent limitation of widely used traditional organic flexible substrates. Herein, an electrospinning polyacrylonitrile (PAN) nanofiber network was designed as a flexible substrate, on which an ultraflexible wearable gas sensor was prepared with in situ assembled polyaniline (PANI) and multiwalled carbon nanotubes (MWCNTs) as a sensitive layer. The unique nanofiber network and strong binding force between substrate and sensing materials endow the wearable gas sensor with excellent robustness, flexibility, and gas permeability. The wearable sensor can maintain stable NH3 sensing performance while sustaining extreme bending and stretching (50% of strain). The Young’s modulus of wearable PAN/MWCNTs/PANI sensor is as low as 18.9 MPa, which is several orders of magnitude smaller than those of reported flexible sensors. The water vapor transmission rate of the sensor is 0.38 g/(cm2 24 h), which enables the wearing comfort of the sensor. Most importantly, due to the effective exposure of sensing sites as well as the heterostructure effect between MWCNTs and PANI, the sensor shows high sensitivity to NH3 at room temperature, and the theoretical limit of detection is as low as 300 ppb. This work provides a new avenue for the realization of reliable and high-performance wearable gas sensors.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jing Cao,Jiahao Li,Zhiying Sun,Haixu Cui,Shuangming Wang,Qianqian Song,Xiao Dong,Zixuan Zhang,Zhixu Ye,Xiaoxue Xu,Yao Wang
Universal sensitivity and high operating temperature have always been the serious problems faced by semiconductor based gas sensors in practical applications. The use of photoelectric and Localized Surface Plasmon Resonance (LSPR) effects can replace heating to provide energy to electrons. However, the differences between electrons generated by photoelectirc effect and LSPR effect, as well as the impact of these differences on gas sensing performance are still unclear. In this work, gold and silver modified In 2 O 3 nanocubes are designed and employed as a gas sensor to study the above issues. The gas sensing characteristics under different wavelengths of light are researched. A room temperature natural light assisted gas sensor with high sensitivity and selectivity has been obtained. The key factors affecting selectivity are discussed in details and it is innovatively discovered that selectivity is closely related to the conduction band edge energy levels of sensitive materials. In addition, it is revealed that the reason why the LSPR effect improves gas sensing performance is that the increased electrons in the conduction band come from metal particles, thereby reducing the electron hole recombination rate. Density functional theory (DFT) is employed to provide theoretical support for the proposal. This work opened up a new strategy for the development of room temperature high performance gas sensors.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Yue Chen,Yu Ma,Chen Liao,Jiacheng You,Huihuang Fang,Chongqi Chen,Yu Luo,Lilong Jiang
The construction and stabilization of Cu–O–Si interfaces in copper-based catalysts remain critical yet challenging for the water-gas shift reaction (WGSR), as conventional strategies fail to mitigate copper nanoparticle (NP) aggregation and interfacial instability. This study innovatively proposes a spatial confinement strategy by anchoring Cu NPs inside (Cuin/SBA-15) or outside (Cuout/SBA-15) the mesoporous channels of SBA-15, leveraging nanoscale confinement to optimize Cu–O–Si interfaces. The confined Cuin/SBA-15 catalyst demonstrated exceptional WGSR performance, achieving a reaction rate of 5.4 μmolCO·gcat−1·s−1, significantly surpassing conventional Cu/SBA-15 (3.1 μmolCO·gcat−1·s−1) and surface-loaded Cuout/SBA-15 (2.8 μmolCO·gcat−1·s−1), along with remarkable stability. This enhancement originates from the SBA-15 channels enabling the in situ formation of stable Cu–O–Si interfaces, which regulate the dynamic equilibrium between Cu0 (active for H2O dissociation) and Cu+ (critical for CO adsorption) species. In situ studies revealed their synergistic dynamic interconversion during WGSR, while domain confinement effects suppressed sintering by maintaining interfacial integrity. Kinetic and mechanistic analyses further identified the associative pathway, with HCOO* intermediate dissociation as the rate-determining step, facilitated by the stabilized Cu–O–Si interfaces. By resolving interfacial instability through confinement engineering, this work provides a paradigm for designing robust Cu-based catalysts, advancing both fundamental understanding and practical applications in WGSR and related heterogeneous catalysis.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shuaihu Ma,Lin Zhu,Kang Liu,Cao Liu,Zhilou Liu,Jixiang Xu,Jishu Han,Hui Liu,Lei Wang,Shu Yang
Metal selenides have been demonstrated as promising Hg 0 adsorbents, while their poor high temperature activity impedes their application feasibility in non-ferrous smelting flue gas. Herein, highly well-dispersed CoSe 2 nanoparticles were immobilized on the inner of carbon layer via an in-situ carbon coating strategy, consequently demonstrating improved Hg 0 removal performance. Compared to CoSe 2 , CoSe 2 /NC exhibited remarkably higher mercury removal activity, which may be attributed to more active sites (Co 3+ , Se 2 2- ) exposed between carbon interfaces and CoSe 2 . More significantly, CoSe 2 /NC with a moderate carbonization temperature of 500℃ could maintain its stable Hg 0 removal activity at a wide operating temperature range (60–240 °C). The saturation adsorption capacity of CoSe 2 /NC-500 could achieve 510.48 mg·g −1 at 180 °C. The outstanding adsorption activity at elevated temperature is mainly attributed to the thermostability of active Se species immobilized in the carbon layer by both space constraint and chemical interaction, leading to the enhanced mercury diffusion migration energy barrier from 0.41 to 0.79 eV on CoSe 2 . The present study aims to take an important step toward the rational design of selenium-based adsorbents for mercury removal from nonferrous smelting flue gas through the excellent protective properties of carbon coating.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hui Wang,Duohang Bi,Bowen Yu,Qiang Chen,Shuo Du,Ge Xie,Jintao Zhu,Lianbin Zhang
Photodynamic therapy (PDT) offers potential for combating bacterial infections through the generation of reactive oxygen species (ROS). However, the antibacterial efficiency of PDT is largely impeded by the limited photon absorption of photosensitizers and the short diffusion length and lifespan of ROS. Herein, we present a light-harvesting platform based on l -arginine-modified photonic hydrogels loaded with new indocyanine green (PG@Arg/IR820) for synergizing the slow photon effect with NO gas therapy to enhance PDT antibacterial efficiency. Upon near-infrared (NIR) light irradiation, PG@Arg/IR820 can maximize the utilization of photons via the slow photon effect to generate sufficient ROS, which not only acts as the primary bactericidal agent in PDT but also triggers l -arginine to generate NO. NO exhibits a long diffusion distance and lifespan and can freely diffuse to inhibit distant bacterial growth, demonstrating a vital complementary advantage in bacterial inactivation by ROS. The synergistic effect of the slow photon effect combined with NO gas therapy allows PG@Arg/IR820 to intensify bacterial destruction and enhance PDT antibacterial efficiency. This antibacterial system sheds light on an advisable design principle for efficient antibacterial activities in photodynamic inactivation.
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Bioactive Materials
·
2025
·
IF 20.3
Yuyun Ye,Yan Liu,Shengchao Ma,Xipeng Li,Wei Wang,Xu Chen,Judun Zheng,Zhijin Fan,Yideng Jiang,Yuhui Liao
Infectious wound healing remains a significant medical challenge due to chronic inflammation and bacterial colonization. Effective antimicrobial and anti-inflammatory therapies are essential to facilitate wound recovery. Herein, we introduce a highly biocompatible, ROS-responsive DNA hydrogel (LGAH), modified with aggregation-induced emission luminogens (AIEgen) and incorporating ginseng-derived exosomes (G-Exos) and nitric oxide (NO) donor-L-arginine (L-Arg) to promote healing of infected wounds. The hydrogel degrades in response to elevated ROS levels, releasing therapeutic agents. Upon laser irradiation, AIEgen generates 1 O 2 , which activates L-Arg to produce NO, leading to a synergistic antimicrobial effect. NO is particularly effective at inhibiting bacterial growth and promoting angiogenesis, supporting wound healing. G-Exos modulate immune responses, reduce inflammation, and promote the transition from the inflammatory to the proliferative phase. They also enhance cell proliferation, migration, and collagen production, which are key to tissue regeneration. In vivo experiments demonstrated that LGAH significantly accelerates S. aureus -infected wound healing by modulating the wound microenvironment and promoting tissue regeneration. Transcriptomic analysis revealed that LGAH down-regulates gene expression in inflammation and immune response signaling pathways while up-regulating genes related to energy metabolism. Biosafety evaluations at cellular and animal levels have demonstrated that LGAH possesses excellent biocompatibility and biodegradability, making it ideal for tissue repair and regeneration. This multifunctional DNA hydrogel system offers a safe and promising strategy for the clinical treatment of infected wounds.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Shuyu Wang,Miaomiao Cheng,Shenghui Wang,Wei Jiang,Feifei Yang,Xiaomei Shen,Lirong Zhang,Xiyun Yan,Bing Jiang,Kelong Fan
Radiotherapy (RT), essential for treating various cancers, faces challenges from tumor hypoxia, which induces radioresistance. A tumor-targeted “prosthetic-Arginine” coassembled nanozyme system, engineered to catalytically generate nitric oxide (NO) and oxygen (O 2 ) in the tumor microenvironment (TME), overcoming hypoxia and enhancing radiosensitivity is presented. This system integrates the prosthetic heme of nitric oxide synthase (NOS) and catalase (CAT) with NO-donating Fmoc-protected Arginine and Ru 3+ ions, creating HRRu nanozymes that merge NOS and CAT functionalities. Surface modification with human heavy chain ferritin (HFn) improves the targeting ability of nanozymes (HRRu-HFn) to tumor tissues. In the TME, strategic arginine incorporation within the nanozyme allows autonomous O 2 and NO release, triggered by endogenous hydrogen peroxide, elevating NO and O 2 levels to normalize vasculature and improve blood perfusion, thus mitigating hypoxia. Employing the intrinsic O 2 -transporting ability of heme, HRRu-HFn nanozymes also deliver O 2 directly to the tumor site. Utilizing esophageal squamous cell carcinoma as a tumor model, the studies reveal that the synergistic functions of NO and O 2 production, alongside targeted delivery, enable the HRRu-HFn nanozymes to combat tumor hypoxia and potentiate radiotherapy. This HRRu-HFn nanozyme based approach holds the potential to reduce the radiation dose required and minimize side effects associated with conventional radiotherapy.
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Exploration
·
2025
·Vol. 5
·期 6
·20240410
·
IF 22.5
Gui Chen,Wenjia Zhang,Manchun Wang,Fengling Zhang,Mengliang Zhu,Yan Tang,Yixian Xie,Wen Ma,Peter Timashev,Massimo Bottini,Yingqiu Xie,Xing-Jie Liang,Meng Yu,Zhiqiang Yu
Gas therapy has been limited in its application as a robust standalone antitumor strategy due to the restricted gas production and cytotoxicity. To address this challenge, we employed electrotoxic PtRu composite metal nano-berries (PR) loaded with various therapeutic gas donors to construct a groundbreaking electric field-induced cascade gas therapy (EGT) platform, which generated a great electro-stress storm at tumor sites, exerting electrotoxicity and immunity functions against solid tumors, including those of large volume, through three pathways. Initially, electric field stimulation effectively boosted the release rate and yield of therapeutic gases from the EGT platform. Further, gas molecules reacted with reactive oxygen species (ROS) to either form oxidation coordination (CO and ROS) or generate more potent therapeutic components (RNS produced from ROS and NO), contributing to an electro-stress storm that augmented the cytotoxic potential of the gas components. Subsequently, this electro-stress storm further activated the tumor immune response, identifying and capturing escaped tumor cells, which held significant implications for treating tumors, including non-solid tumors with indistinct boundaries. In summary, the EGT platform leveraged an electro-stress storm to achieve ablation of large volume solid tumors and suppressed metastatic tumors, paving new pathways for gas-based therapeutic strategies.
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