LANGMUIR
·
2026
·
IF 3.9
Si-Mian Liu,Mu-Lan Yao,Xiao Wang,Long Tang,Ji-Jiang Wang,Xiang-Yang Hou
Excessive nitrite poses potential threats to human health, making the convenient and accurate detection of nitrite anions (NO2–) critically important for practical applications. Two-dimensional (2D) metal–organic frameworks (MOFs) have attracted attention in the design and application of electrochemical sensors due to their unique structure. In this work, based on the 2D [Cd2(BPDC)2(1,4-bis)2]n (MOF1, 4,4′-biphenyldi-carboxylic acid = H2BPDC, 1,4-bis(imidazol-1-ylmethyl)-benzene = 1,4-bis) and acetylene black (AB), a novel electrochemical AB/MOF1/glassy carbon electrode (GCE) sensor is constructed and demonstrated for sensitive detection of NO2– in the solution. The research demonstrates that the AB/MOF1/GCE electrochemical sensor exhibits a wide linear response range (2–200 μM) and a low detection limit (5.7093 × 10–8 M), attributable to the synergistic effect of the selectivity contributed by the 2D MOF1 structure and the enhanced sensitivity provided by the AB. It demonstrated excellent selectivity, long-term stability, and reproducibility and can be successfully used for the detection of nitrite in actual samples with a recovery rate of 95.35–104.94%. This paper provides the synthetic application of electrochemical sensors and an effective detection method for carcinogen NO2– in the environment.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Jinrong Chuan,Shengzhi Duan,Yumei Li,Linping Liu,Jiyun Gao,Chenhui Liu
Microwave-assisted molten salt etching enables rapid, green preparation of Ti 3 C 2 T x from Ti 3 AlC 2 in 15 min. • In situ sulfidation achieves one-step construction of SnS 2 /Ti 3 C 2 T x heterojunctions. • SnS 2 /Ti 3 C 2 T x shows a 472% NO 2 response at room temperature, with 39.73 ppb LOD and good stability. • DFT calculations reveal band regulation at heterojunctions, enhancing NO 2 adsorption via p-type channels. MXenes have attracted attention in room-temperature gas sensing due to their high conductivity and tunable surface groups. However, conventional preparation often relies on fluoride-containing etching and stepwise processes, which are not only cumbersome but also hazardous. Herein, a microwave-assisted Lewis acidic molten salt etching strategy was developed to efficiently etch Ti 3 AlC 2 within 15 min, accompanied by the simultaneous in situ growth of Sn nanoparticles on Ti 3 C 2 T x . Subsequent in situ sulfidation formed SnS 2 /Ti 3 C 2 T x heterojunctions. The material exhibits outstanding NO 2 -sensing performance at room temperature: a response of 472% toward 100 ppm NO 2 , together with excellent selectivity, long-term stability, and a low limit of detection (LOD) of 39.73 ppb. The enhancement is ascribed to the SnS 2 /Ti 3 C 2 T x heterointerfaces and abundant adsorption sites derived from the enlarged specific surface area. DFT calculations reveal that band modulation induced by work function differences creates p-type conductive channels, clarifying the sensing mechanism. This study offers a green, rapid fabrication approach for high-performance room-temperature gas sensors. Download: Download high-res image (206KB) Download: Download full-size image
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xuezheng Guo,Yijie Shi,Peilin Liu,Yanqiao Ding,Bingsheng Du,Chengyao Liang,Wen Niu,Yiling Tan,Yuhui He,Jiangzhao Chen,Xiangshui Miao,Xi Yang,Yong He
Explosives can be analyzed for their content by detecting the photolytic gaseous byproducts. However, to prevent electrostatic sparking, explosives are frequently preserved in conditions with low temperatures and high humidity, impeding the performance of gas detection. Thus, it has become a research priority to develop gas sensors that operate at ambient temperature and high humidity levels in the realm of explosive breakdown gas-phase detection. In this work, 3-aminopropyltriethoxysilane (APTES) self-assembled monolayer-functionalized tin diselenide (APTES-SnSe2) nanosheets were synthesized via a facile solution stirring strategy, resulting in a room-temperature NO2 sensor with improved sensitivity and humidity tolerance. The APTES-SnSe2 sensor with moderate functionalization time outperforms the pure SnSe2 sensor in terms of the response value (317.51 vs 110.98%) and response deviation (3.11 vs 24.13%) under humidity interference to 500 ppb NO2. According to density functional theory simulations, the stronger adsorption of terminal amino groups of the APTES molecules to NO2 molecules and stable adsorption energy in the presence of H2O are the causes of the improved sensing capabilities. Practically, the APTES-SnSe2 sensor achieves accurate detection of photolysis gases from trace nitro explosives octogen, pentaerythritol tetranitrate, and trinitrotoluene at room temperature and various humidity levels. This study provides a potential strategy for the construction of gas sensors with high responsiveness and antihumidity capabilities to identify explosive content in harsh environments.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Bala Ismail Adamu,Attia Falak,Yi Tian,Xinghua Tan,Xiangmin Meng,Peipei Chen,Hanfu Wang,Weiguo Chu
High sensitivity, low limit of detection (LOD), and short response and recovery times at room temperature (RT) are critical for gas sensors. For NO2, different binary metal oxide-based sensors were developed to achieve superior performance at elevated temperatures instead of RT. Herein, we report on CuO@CuO and Cu3Mo2O9@CuO sensors with CuO and Cu3Mo2O9 micro/nanorods vertically aligned on the CuO layers, which were directly fabricated using a facile, low-cost, and catalyst-free chemical vapor deposition (CVD) technique. Their sensing performance tests revealed that the Cu3Mo2O9@CuO p–p heterojunction sensors exhibited a high response of 160% to 5 ppm NO2, an excellent sensitivity of 50% ppm–1, a low LOD of 2.30 ppb, a short response time of 49 s, and a rapid recovery of 241 s at RT, obviously better than those for CuO@CuO sensors. The superior performance of Cu3Mo2O9@CuO sensors could be attributed to the Schottky heterojunction formed between p-Cu3Mo2O9 micro/nanorods and p-CuO films, the catalytic effect, and the anisotropic nature of Cu3Mo2O9 micro/nanorods. This study not only provides a simple, low-cost, and batchable fabrication method of homo/heterojunction sensors with micro/nanorods vertically aligned on films but also opens an avenue for sensor design by tuning the Schottky barrier height to enhance RT performance.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiaohang Ji,Yang Li
Developing gas sensors with high sensitivity and good selectivity at room temperature is essential for the detection and control of trace toxic gases which pose great threats to human health. Herein, a facile and scalable method is proposed to prepare gas sensitive materials of reduced graphene oxide (rGO)@MOX (MOX = SnO2, Mn3O4, FeOOH, Cu2(OH)3Cl) via electrostatic interactions between rGO and metal ions of lower valence and subsequent nucleation and growth at ~80oC. The rGO@MOX sensors composed of uniformly dispersed MOX on rGO sheets, exhibit significantly higher sensitivity to trace NO2 at room temperature than that based on rGO alone. Remarkably, rGO@Cu2(OH)3Cl presents the state-of-the-art response of 220% to trace NO2 (5 parts per billion) and ultra-low limit of detection of 5.0 parts per trillion. Furthermore, the sensor shows good repeatability, long-term stability and high selectivity as revealed by little change of the response by coexistent interference gases of much higher concentrations. Complex impedance spectroscopy analysis reveals that the excellent response to trace NO2 is ascribed to the modulation of nanograin boundary barrier among rGO@MOX. The work provides an effective approach for constructing high performance sensors to detect trace gases at room temperature.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yajun Zhao,Yanwei Li,Xuping Li,Qianxi Wang,Guang Sun,Jianliang Cao,Yan Wang
Herein, we propose a ZnO and Pt co-modification strategy to boost the NO 2 sensing performance of SnO 2 . Specifically, a ternary Pt/ZnO/SnO 2 composite was prepared by sequentially decorating ZnO and Pt nanoparticles onto a porous nanorod-assembled hierarchical structure (PNRHS) of SnO 2 . The resulting Pt/ZnO/SnO 2 composites were characterized using various techniques, and their sensing properties to NO 2 were investigated. The results reveal that after co-modification with ZnO and Pt, the SnO 2 sensor exhibits remarkable performance enhancements in detecting sub-ppm-level NO 2 , including significantly improved sensitivity, superior gas discrimination capability, and accelerated response kinetics. At its optimal working temperature of 140 °C, the optimized Pt/ZnO/SnO 2 sensor demonstrates a response of 105.6–1 ppm NO 2 , approximately 42.2, 7.4, and 7.9 times than that of the pure SnO 2 (2.5 at 120 °C), ZnO/SnO 2 (14.3 at 150 °C), and Pt/SnO 2 (13.3 at 140 °C) sensors, respectively. The enhanced NO 2 sensitivity of the ternary Pt/ZnO/SnO 2 composite sensor is attributed to the synergistic sensitization effects of the ZnO and Pt modifiers, whose underlying mechanisms are discussed.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guo-Li Chen,Hui-Ye Jiang,Yan Jiang,Zhao-Peng Deng,Ying-Ming Xu,Li-Hua Huo,Shan Gao
The efficient and synchronous monitoring of diverse harmful gases by one portable sensor has recently become a hot topic due to the vast majority of reports for only sensing a given gas. Herein, two types of hollow microspheres cross-linked through γ-WO 3 nanosheets were controllably prepared by simple pyrolysis of commercial ammonium metatungstate (AMT). Among, the orange product obtained by air calcination at 400 °C is trace (NH 4 ) 0.33 WO 3 doped γ-WO 3 composite, and has broad mesoporous structure, rich oxygen vacancies and the synergistic catalysis of surface W 6+ Lewis acid. These unique factors help to promote the diffusion of gas molecules, expose more active sites for chemical reaction, increase the conductivity of sensitive material and modulate the state of surface adsorbed oxygen species, which in turn effectively improve its sensitive capability toward diverse noxious gases. The (NH 4 ) 0.33 WO 3 /WO 3 sensor achieves response values of 234 for 5 ppm NO 2 at low 50 °C and 170 for 100 ppm diisopropylamine (DIPA) at 170 °C. Meanwhile, it also displays low detection concentrations, good reversibility and moisture resistance, as well as practical detection for vehicle exhaust and prometryn. This is also the first report of a WO 3 -based sensor that can simultaneously achieve dual-detection of trace NO 2 and DIPA. Moreover, the temperature-tuned dual-response mechanism has also been discussed in detail.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ping Guo,Xuyang An,Xinxin He,Yinhua Hu,Jia Zhang
NO 2 is a prevalent atmospheric pollutant known to cause significant harm to both the environment and human health. In practical applications, the development of NO 2 sensors capable of functioning over a wide humidity range with high sensitivity and stability is crucial. Here, the Pt-decoration multi-scale three-dimensional Bi 2 S 3 nanoflower structure assembled by one-dimensional nanorods and two-dimensional reticulated nanomeshes was constructed by integrating the geometrical and electronic effects. The Pt/Bi 2 S 3 based sensors exhibit a high response of 3.92 and rapid response/recovery times of 15 s/136 s to 1 ppm NO 2 at room temperature. Furthermore, the Pt/Bi 2 S 3 based sensors show excellent selectivity and stability across a wide range of humidity levels (10 %-90 %RH). Finally, a portable NO 2 detector was designed for data acquisition and wireless transmission to enable real-time gas detection and hazard warning. Our study presents a multi-scale structure for sensitive materials design and practical application of high-performance NO 2 sensors operated in a wide humidity range at room temperature.
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CRYSTENGCOMM
·
2015
·Vol. 17
·期 11
·2376-2388
·
IF 4.034
Xiang-Sheng Zhai,Wen-Gang Zhu,Wei Xu,Ya-Jing Huang,Yue-Qing Zheng
Four new 3D uranyl complexes, [(UO2)2(H2O)(ipa)2]·9H2O (1), [(UO2)2(H2O)(nip)2]·H2O·Et3NH (2), [(UO2)2(H2O)(aip)2]·Et3NH (3) and [(UO2)(hip)]2·17H2O (4) (H2ipa = isophthalic acid, H2nip = 5-nitroisophthalic acid, H2aip = 5-aminoisophthalic acid, H2hip = 5-hydroxyisophthalic acid, Et3N = triethylamine), were hydrothermally synthesized. Structural analyses reveal that compounds 1–4 consist of pentagonal bipyramidal uranyl monomers bridged via acid inkers to form a structural motif, [(UO2)2L2], serving as the foundation of the 3D framework. Two structural motifs adopt different arrangement modes to connect to two types of chains. For 1–3, uranium atoms and carboxyl groups being from two types of chains respectively are coordinated to build similar 3D frameworks, while for 4, one type of chain links to the 3D architecture by the bond of the uranium atoms and –OH of the 5-hydroxyisophthalic acid ligand. The different guest molecules and structure assemblies displayed by the four compounds are a function of the variation of substituent groups of 5-X-1,3-benzenedicarboxylic acid (X = –H, –NO2, –NH2, –OH). Furthermore, the photocatalytic properties of 2 and 4 for degradation of rhodamine-B (RhB) upon xenon lamp irradiation have been examined. Elemental analysis, infrared spectroscopy, DRS and luminescence properties were also discussed.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Junxue Liu,Wenyan Ma,Yufei Wang,Qinfen Gu,Qinhe Pan,Siyu Zong,Minghao Qin,Jiyang Li
Monitoring of gallic acid (GA) in food and biothiols in humans is crucial for body health. Nanozyme-mediated colorimetric strategy for evaluating them has been widely applied nowadays, however, the inferior efficient and susceptible single-signal recognition limit its further application. Herein, a sensitive biosensor was first constructed for bimodal detection of GA and biothiols based on CDs@MIL-53(Fe)-NO 2 , prepared through a facile and time-saving microwave treatment. Benefiting from the excellent fluorescent and electron transfer properties of CDs, CDs@MIL-53(Fe)-NO 2 exhibited significant enhanced blue fluorescence and oxidase-like activity, which could oxide colorless 3,3′,5,5′-tetramethylbenzidine without H 2 O 2 , and the blue product could quench the fluorescence of composite. The dual-mode assay based on such bifunctional nanozyme showed an extremely sensitivity towards GA/ l -cysteine/homocysteine with the detection limit of 62/65/124 nM and 17/16/27 nM in colorimetric/fluorescent modes, respectively. The practicability in real samples and portability based on a smartphone of the analysis has been investigated with reliable results.
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FOOD CONTROL
·
2021
·
IF 5.548
Weixia Yang,Jinmeng Wang,Yong Han,Xueli Luo,Wenzhi Tang,Tianli Yue,Zhonghong Li
Pb(II), a highly toxic heavy metals that targets the human nervous system, has contaminated water and food in recent years. The nanomaterial of Metal–organic frameworks (MOFs) possesses superior removal performances. However, their practical application is limited by their nature of fine powdery. Herein, we developed robust MOFs film without the adding of polymer in MOFs ink and the modification of the substrate, which was achieved by choosing appropriate substrate of gelatin hydrogel with functional groups and simple thermal-treatment after coating UiO-66-NO 2 onto gelatin hydrogel. The volatilization of the UiO-66-NO 2 dispersant ethyl acetate promotes the rearrangement and dense accumulation of UiO-66-NO 2 crystals to form a dense UiO-66-NO 2 film. During the following thermal-treatment process, –COOH of UiO-66-NO 2 and –NH 2 of gelatin chemically reacted to establish the stable composites of UiO-66-NO 2 film and gelatin hydrogel. The results of batch adsorption experiments demonstrate that adsorption behaviors of the as-synthesized gelatin/UiO-66-NO 2 film composite hydrogels can be explained by the pseudo-second-order kinetic model and the Langmuir isotherm model, stating that this adsorption process involves with a chemical monolayer adsorption. Besides, gelatin/UiO-66-NO 2 film composite hydrogels own satisfactory removal efficiency for Pb(II) in apple juice, and the adsorption process has little impairment on the quality of apple juice. These results suggest that MOFs film is suitable for water decontamination and food safety control fields.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiaoyu Zheng,Lin Xing,Xuemei Zhou,Yulian Tang,Zhen Liu,Xueting Zhang,Lei Hu,Zhengquan Yan
To monitor toxic NO 2 − and S 2− conveniently and effectively in 100% aqueous, nano CeO 2 was identified and modified first onto 2-dimensional Co 3 O 4 substrate (CeO 2 @2D Co 3 O 4 ) under microwave-assisted conditions at 140 °C. The obtained CeO 2 @2D Co 3 O 4 expressed excellent stability and superior oxidase-mimic activity with a wide temperature range from 20 to 60 °C. Under the optimized conditions (pH 4.0, 25 °C, 0.07 mM TMB), CeO 2 @2D Co 3 O 4 could accelerate the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue oxidation (oxTMB) within 12 min at room temperature , whose Michaelis constant ( K m ) and maximal reaction rate ( v max ) were 0.017 mmol/L and 2.17 × 10 −7 mol/L·s –1 respectively. Especially, both NO 2 − and S 2− could exclusively make the blue CeO 2 @2D Co 3 O 4 -TMB system into colorless and green respectively, expressing significant visibility. When applied for visual detection of NO 2 − and S 2− in real water, soil, drink and food samples, the recoveries were 97.6~104.6% and 97.5~104.1% with low detection limits of 3.26 × 10 −9 mol/L and 6.65 × 10 −8 mol/L (S/N = 3), far below the maxima in drinking water permitted by World Health Organization (WHO). The strengthened oxidase-mimic activity of CeO 2 @2D Co 3 O 4 and its different recognition mechanisms to NO 2 − and S 2− were studied in detail.
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