CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yuming Tan,Pinghua Tang,Yong Zhang
The development of high-performance ammonia sensors is crucial for environmental monitoring and human health protection. However, traditional conductive metal oxide gas sensors encounter significant challenges such as poor selectivity and high detection limit, mainly raising from their inherent cross-sensitivity and thick gas-sensing layer caused by uncontrollable preparation. Herein, a noble metal platinum-modified tungsten oxide (Pt/WO 3 ) gas sensor is controllably fabricated via inkjet printing technology and magnetron sputtering. In addition to a detection limit toward ammonia as low as 40 ppb, the Pt/WO 3 gas sensor demonstrates a good selectivity for ammonia compared to other interfering gases, including acetone, sulfur dioxide, formaldehyde, methane, sulfur hexafluoride, and toluene, with corresponding selectivity coefficients not less than 4.7. The high sensitivity of the gas sensor is mainly attributed to the fact that more electrons can be directly controlled by the adsorbed gas benefiting from the micro-nano thickness of the sensing layer, as well as additional adsorption sites are provided by the Pt modification. Moreover, the catalytic effect of Pt on the reaction between ammonia and oxygen ions further enhances its sensitivity while also improving its selectivity. Our work establishes an important theoretical and experimental foundation for the design of high-performance ammonia sensors.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 6
·4329-4334
·
IF 3.84
Jikui Wang,Jiahong Guo,Pengxiang Si,Wanping Cai,Yuming Wang,Genhua Wu
An In(OH)3–PDMS sponge has been synthesized by covalent modification of PDA. The sponge can switch surface wettability reversibly between superhydrophobicity and superhydrophilicity when detecting ammonia. The water contact angle changes from 141.5° to 0° after storage in an ammonia atmosphere, which means an ammonia responsive surface wettability switch. The minimum NH3·H2O concentration that the In(OH)3–PDMS can detected is 5% in 2 h. This kind of quick and sensitive ammonia detector is promising simply by virtue of the surface wettability conversion.
研究领域:
材料科学
·
化学工程
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Dongmei Liu,Xuejia Chen,Hui Zeng,Chang Liu,Biyu Tang,Yan Li,Lishan Zhang,Min Zhang
In this work, a novel, low-cost soap-film sensor for detecting ammonia in environmental water and saliva was developed. A 3D printed circular frame with two stainless steel electrodes was implemented as a carrier for a soap film. The soap film was manually generated by pulling the 3D printed frame from a mixture solution containing 20.7 g/L gelatin, 241.4 mL/L Glycerol, 34.5 mL/L Triton X-100 and 100 mM boric acid . The conductivity of the soap film was measured with a lab-made detector. For liquid sample analysis, sample and NaOH solution were mixed in a reagent bottle as the gas-diffusion vessel (GDV). The released ammonia from the reaction was then diffused into the headspace of the GDV and absorbed by the soap film. The conductivity increasing rate of the soap film was used for quantifying the ammonium concentration in sample. The analytical performance parameters were demonstrated, including a linear range of 0–500 μM, a relative standard deviation of 3.2 % ( n = 10), and a limit of detection of 14 μM (0.2 mg N/L). This method showed a 90–110 % recovery rate for saliva and water samples. Compared to a reference indophenol blue method, the relative deviations of two method were less than 7.4 % ( n = 33). The proposed method is easy to operate, and the device itself is compact and low cost. The soap-film sensor enables rapid renewal to avoid contamination.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Rui Gao,Xiangbo Ma,Lihong Liu,Shan Gao,Xianfa Zhang,Yingming Xu,Xiaoli Cheng,Hui Zhao,Lihua Huo
The o-methoxyaniline (OMA) monomer was polymerized in-situ by vapor phase polymerization to form uniform and dense poly-o-methoxyaniline (POMA) film on the surface of ZnO nanorods array film which was pre-prepared by hydrothermal method . The as-prepared POMA/ZnO composite shows the best response at 40 min of vapor phase polymerization time. The response to 100 ppm ammonia at 25 °C is 8.88. The recovery time of 136 s has a certain advantage in the reported room temperature ammonia sensors. The lowest detectable concentration is as low as 0.01 ppm. The fast recovery time and low detection limit make the sensor have broad application prospects. In order to explore the response mechanism of POMA/ZnO composite to ammonia gas, the work function of POMA and ZnO and corresponding band gap energies were tested respectively. And the effect of the formation of p-n heterostructure on gas response was further explored. The actual application test results reflect that the sensor can effectively identify NH 3 in the mixed gas during the production, storage and transportation of NH 3 . This can provide real-time early warning of NH 3 leakage. Especially, the sensor can detect trace amount of NH 3 in the human body's exhaled breath which is expected to realize the preliminary screening of patients with kidney disease through the detection of exhaled breath in the medical field.
研究领域:
材料科学
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化学传感器
·
纳米技术
·
医学诊断
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yuehua Li,Shaoxian Li,Weiwei Meng,Lei Dai,Ling Wang
A series of impedancemetric sensors for ammonia detection were fabricated using yttrium stabilized zirconia (YSZ) electrolyte and La n+1 Ni n O 3n+1 (n = 1, 2, and 3) sensing electrodes. The sensing materials with layered perovskite structure were prepared using in-situ impregnation method and well-dispersed in YSZ porous skeleton after calcination at 900 °C. The sensing performances of the sensors with La n+1 Ni n O 3n+1 sensing electrodes were investigated using the impedancemetric modulus |Z| and phase angle Θ as response signals, respectively. The results show that the sensor with La 2 NiO 4+ δ sensing electrode exhibits the higher response values and sensitivity compared to the sensor using La 3 Ni 2 O 7- δ or La 4 Ni 3 O 10- δ sensing electrodes, which is attributed to the largest NH 3 adsorption capacity of La 2 NiO 4+ δ . The response signals |Z| or Θ of the La 2 NiO 4+ δ based sensor linearly depend on NH 3 concentrations. The sensor hardly is insensitive to co-existing gases such as CO 2 , CH 4 , H 2 and relative humidity, but NO or NO 2 causes a positive error.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Advanced Sensor and Energy Materials
·
2024
·
IF 0
Yu Liu,Xu Zeng,Yulong Wu,Habib Ullah Khan,Fei Xiao,Bao Yu Xia,Yimin Sun
The development of technologically advanced fiber-based flexible microelectrodes has been of extensive research interest in healthcare systems because of their unique construction and synergistic effect on multifunctional properties. In this work, we constructed functional MXene fiber (MXF) by a simple and versatile wet spinning method, and then, a well-aligned ZIF-67 nanoarray was grown in situ on the surface. Using the chemical vapor deposition (CVD) method, carbon nanotubes (CNTs) were produced on MXF via the pyrolysis of ZIF-67 and melamine. Finally, Pt nanoparticles were electrodeposited on the CNTs forest, and a Pt@CNTs/MXF electrode was obtained. Owing to the plethora of surface active sites and the synergistic effects between MXene, CNTs, and Pt nanoparticles, the as-fabricated fiber electrode enabled the precise detection of ammonia under alkaline conditions via differential pulse voltammetry (DPV), which exhibited a linear range of 0.1 μM-10 mM and a detection limit of 73.2 nM. Due to their good performance in ammonia detection, Pt@CNTs/MXF electrodes could be adopted to determine the ammonia concentration in urine for clinical estimation, which provides a practical approach for the diagnosis of urinary ammonia-associated diseases.
研究领域:
生物医学工程
·
分析化学
·
纳米材料
·
传感器技术
✓ 已验证
DOI
Analytical Methods
·
2025
·Vol. 17
·期 7
·1493-1502
·
IF 2.6
Yao Hu,Donghui Wang,Bo Hu,Haihui Lan,Wen Zhong,Qi Wang,Huicong Xia,Mingde Yao,Mingqing Chen,Mingliang Du
The field of electrochemical ammonia synthesis has made rapid advancements, attracting a large number of scientists to contribute to this area of research. Accurate detection of ammonia is crucial in this process for evaluating the efficiency and selectivity of electrocatalysts. In this study, we systematically investigate the indophenol blue method for ammonia detection, examining the effects of key factors such as solution pH, nitrate concentration, and metal ion concentration on measurement accuracy. Based on experimental optimization and mathematical algorithms, we propose an iterative refinement method supported by custom-developed code. This method automates the generation and adjustment of calibration curves, reduces measurement errors, and enhances detection precision, offering a valuable framework for the quantitative detection of ammonia and other small molecules in electrochemical synthesis.
研究领域:
分析化学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 29
·期 1
·e202202658
·
IF 5.02
Maruf Ahmed,Ruihua Zhao,Tian Xing,Jianping Du
Graphical ZnO/BiOCl heterojunction material is fabricated by constructing netlike ZnO and BiOCl nanosheets. It exhibits high selectivity to ammonia and detection limit is 0.25 μM, which is suitable to detect volatile amines quantitatively. The synergetic effects of the heterojunction and netlike structures contribute to boosting electrochemical activity. The ZnO/BiOCl hybrid could be an promising candidate for detection and analysis. The electrochemical sensing is a potential method for detection of trace toxic substance. Herein, the heterojunction of netlike ZnO/BiOCl nanosheets was constructed for the enhanced electrochemical detection of ammonia. Cyclic voltammetry and linear sweep voltammetry were used to investigate the electrochemical performance. The results show that the ZnO/BiOCl-modified electrode exhibits higher sensitivity towards ammonia compared with the ZnO and BiOCl-based electrodes, which is ascribed to band structure and fast electron transfer. The high response of 11.8 μA mM −1 and a low detection limit (LOD) of 0.25 μM are achieved. In addition, the ZnO/BiOCl material exhibits high selectivity, repeatability and stability. The better linear relationship between concentration and current ( R 2 =0.99) is significant for quantitative detection of ammonia, implying that netlike ZnO/BiOCl nanosheets can serve as electrochemical sensing platform for detecting toxic substance. This research provides a strategy for fabricating two-dimensional netlike materials and regulating heterojunctions used for electrochemical application.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Lv Wen,Yang Jianhua,Xu Qingda,Mehrez Jaafar Abdul-Aziz,Shi Jia,Quan Wenjing,Luo Hanyu,Zeng Min,Hu Nantao,Wang Tao,Wei Hao,Yang Zhi
Real-time and accurate biomarker detection is highly desired in point-of-care diagnosis, food freshness monitoring, and hazardous leakage warning. However, achieving such an objective with existing technologies is still challenging. Herein, we demonstrate a wireless inductor-capacitor (LC) chemical sensor based on platinum-doped partially deprotonated-polypyrrole (Pt-PPy + and PPy 0 ) for real-time and accurate ammonia (NH 3 ) detection. With the chemically wide-range tunability of PPy in conductivity to modulate the impedance, the LC sensor exhibits an up-to-180% improvement in return loss ( S11 ). The Pt-PPy + and PPy 0 shows the p-type semiconductor nature with greatly-manifested adsorption-charge transfer dynamics toward NH 3 , leading to an unprecedented NH 3 sensing range. The S11 and frequency of the Pt-PPy + and PPy 0 -based sensor exhibit discriminative response behaviors to humidity and NH 3 , enabling the without-external-calibration compensation and accurate NH 3 detection. A portable system combining the proposed wireless chemical sensor and a handheld instrument is validated, which aids in rationalizing strategies for individuals toward various scenarios.
研究领域:
生物医学工程
·
化学传感
·
物联网技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 5
·057526
·
IF 4.316
Mengmeng Xu,Yuhua Dong,Jianbin Zheng
In this article, a core–shell CuPd@UiO-66-NH2 composite material was synthesized by a double-solvent reduction method, and an N2H4 electrochemical sensor based on CuPd@UiO-66-NH2 was constructed. The relationship between the morphology, type, composition, size of the sensor interface composite material and its electrocatalytic performance and sensor response performance was studied, and a new method for detecting N2H4 was established. The surface properties and composition of the materials were studied by transmission electron microscope(TEM),energy dispersive X-ray spectroscopy(EDX) and X-ray diffraction spectroscopy(XRD). The results showed that the synthesized CuPd@UiO-66-NH2 has a regular 3D structure, particle dispersion, and uniform particle size, the particle size is about 90 nm. Electrochemical performance studies showed the sensor is made into detecting N2H4 in a linear range of 0.25 μM ∼ 1.39 mM, with a sensitivity of 386.7 μA·mM−1·cm−2, and a detection limit of 0.08 μM(S/N = 3). Compared with other electrochemical sensors based on metal nanoparticles to detect N2H4, the new sensor exhibited a wider linear range; and its sensitivity was 3 times of that obtained by the Cu-BTC/OMC/GCE. So, the sensor can be used as a potential sensing material to detect hydrazine.
研究领域:
材料科学
·
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 30
·5998-6005
·
IF 6.331
Pan Li,Lixiang Zhang,Sheng Zhang,Chenchen Xu,Yinuo Li,Juan Qu,Shuai Li,Guojiang Mao,Hua Wang
A high-throughput and selective fluorimetric platform has been constructed for the analysis of ammonia in blood by using a polymer-stabilized metal–organic framework (MOF) of porous NH2-MIL-125, which was coated onto a wettable microwells array constructed on an indium tin oxide (ITO) substrate. It was found that the nitrogen plasma treatment for the ITO substrate could create a super-hydrophilic interface that combined with the hydrophobic pattern yielded a wettable microwells array, enabling the condensation-based enrichment of targets from the sample droplets. Moreover, the NH2-MIL-125 MOF encapsulated using polymers could be firmly coated onto the microwells to act as fluorescent probes for sensing NH3 with enhanced responses. In addition, the use of the polymer polyvinyl pyrrolidone could protect and stabilize the crystals of NH2-MIL-125 probe in aqueous media, revealing the improved hydrophilicity and significantly depressed signal background. The as-developed fluorimetric platform, containing a MOF-coated microwells array, can enable the detection of ammonia in blood, with concentrations ranging linearly from 0.10 to 300 μM. More importantly, this plasma treatment-based fabrication route may hold promise for designing different wettable microwells arrays for the high-throughput detection of multiple targets in the fields of biomedical analysis and environmental monitoring.
研究领域:
生物医学分析
·
环境监测
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yiran Zhang,Bang Xiao,Lin Yang,Anqi Jiao,Ke Li,Chunping Wu,Reggie Zhan,Zhen Huang,He Lin
YSZ-based mixed-potential sensors with double-sensing electrodes were fabricated for ammonia (NH 3 ) detection. ZnO and LaCoO 3 nanoparticles prepared by flame spray pyrolysis (FSP) method were used as the sensing materials. The sensing responses of ZnO and LaCoO 3 sensing electrodes can be overlapped based on the double-sensing-electrode structure, thereby significantly enhancing the sensitivity compared with the traditional mixed-potential sensors using Pt reference electrode. The sensitivities of this sensor reached up to -102.85, -75.312, -70.165, -48.616 mV/decade to 10–50 ppm NH 3 at 450, 475, 500, 525 ℃ , respectively. Moreover, the NO 2 interference effects on NH 3 detection of ZnO and LaCoO 3 electrodes were opposite and can be counteracted based on the double-sensing-electrode structure, eliminating most of the cross-sensitivity to NO 2 . The double-sensing-electrode sensor exhibited good performance under CO, CH 4 , NO, NO 2 interference, oxygen fluctuation, and humidity variations, and showed good long-term stability. The results of sensing performance exhibited the sensors with double-sensing electrodes have a great potential for application on SCR system of diesel engines. In further studies, each sensing electrode can be optimized respectively and the sensitivity and selectivity of NH 3 sensors could be enhanced to a higher level.
研究领域:
传感器学
·
材料科学
·
环境监测
·
能源工程
·
气体传感
·
纳米材料
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）