SENSORS
·
2018
·Vol. 18
·期 10
·3195
·
IF 2.475
Jianxin Zhang,Lei Zhou
Making use of the sol-gel technique, an optical pH sensor was prepared, which was made from an organic carrier with four indictors including congo red, bromophenol blue, cresol red, and chlorophenol red, cross-linked by tetraethyl orthosilicate (TEOS) and cellulose acetate. The actual detection range of the optical pH sensor is 2.5–11.0. The optimal ratio of ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in glue precursor of the sensor-sensitive membrane was explored. The orthogonal experiment was designed to optimize the dosage of cellulose acetate,N,N-dimethylformamide (DMF), indicator, hydrochloric acid, and precursor glue in preparing the sensor-sensitive membrane. The linearity, measurement accuracy, repeatability, stability, and response time of the prepared pH sensor were tested. The measurement results were analyzed using a support vector machine and linear regression. The experimental results show that the optical pH sensor has a measurement accuracy of up to 0.2 pH and better stability and repeatability than the traditional pH glass electrode.Keywords:sol-gel technique;optical pH sensor;indicator;sensor-sensitive membrane
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 3
·e56362
·
IF 2.7
Tianbing Li,Xiaozhen Lu,Haonan Chen,Junlong Cai,Hongbo Gao,Xuewu Zhu,Jian Yu,Guangchao Li
Polymer sensitive membrane is a key component of the ammonium ion selective electrode (ISE). Developing a high-performance ammonium ion polymer sensitive membrane can promote production and application of the electrode, reducing costs and simplifying ammonia nitrogen detection. In this study, we modified the surface of the ammonium ion selective membrane and synthesized a low-cost antimicrobial material by anchoring the broad-spectrum antimicrobial agent, silver nanoparticles (AgNPs), on the surface of two-dimensional transition metal car- bides (Ti 3 C 2 Tx MXene). This material can be used as a carrier to avoid the release of AgNPs. The inorganic antimicrobial agent AgNPs@MXene was adhered to the surface of the ammonium ion-selective membrane by polydopamine, forming an antimicrobial coating. The modified ammonium ion-selective electrode had a rapid response time of 12 s, with an average response time of 12.4 s. After repeated tests, a lower detection limit of 5.89 × 10 −7 (10 −6.23 ) mol/L was achieved in ammonium chloride solution. These results indicate that the ammonium ion monitoring electrode we prepared can effectively monitor ammonia nitrogen concentration in sewage and wastewater over a long period of time. This also enhances the service life of the ammonium ISE and reduces maintenance costs for the sensor.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2022
·
IF 2.84
Wei Shuangjiao,Bian Zhenglan,Wang Xingquan,Miao Xiaokang,Zhang Guilin,Xue Liang,Hu Anduo,Li Gaofang,Chu Fenghong
Pt-doped WO 3 materials have good hydrogen-sensing properties, which are widely used in the field of hydrogen sensing. In this paper, Sol-Gel method is used to prepare WO 3 /Pt sensing material and sensing characteristic to hydrogen is characterized by transmission optical fiber hydrogen sensing system fabricated at home. By optimizing the fabrication parameters including sol-gel viscosity, aging time, Pt:W moral ratio and layers of the sensing film, the sensitivity and repeatability of the film were greatly improved. The repeatability of the film is further improved by irradiating the film with an UV lamp. Experimental results show that by increasing the number of film layers from one to five (the thickness of the film is about 222 nm, and the content of Pt element is 13.47% by SEM test), the sensitivity increased by 1.666 times. The repeatability of the film can be improved by 3% through the irradiation of the ultraviolet lamp. The optimized WO 3 /Pt film was tested continuously for 12 times at 5% hydrogen concentration, and the zero drift was only 0.723%.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2019
·
IF 2.739
Pengjia Qi,Tong Zhang,Jieren Shao,Bai Yang,Teng Fei,Rui Wang
A quartz crystal microbalance (QCM) humidity sensor based on graphene quantum dots-chitosan (GQDs-CS) sensitive film has been successfully fabricated in this work. The composite ratio of sensitive material and the coating quality of the sensitive film were optimized. The morphological and chemical properties of GQDs-CS composites were inspected via scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier Transform infrared spectroscopy (FT-IR). The results manifest that prepared QCM sensor exhibits high response sensitivity (a frequency shift of −3291 Hz at 95% RH), short response/recovery time (36 s/3 s), tiny humidity hysteresis (˜1.6% RH), and excellent reproducibility, reversibility and long-term stability. Additionally, the electroacoustic parameters of the QCM sensors were also investigated by means of the impedance analysis method. Based on dynamic and static analysis of the sensor, it is speculated that the introduction of GQDs into CS enhanced the mechanical stiffness of the CS film, which could effectively improve the performance of QCM sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Advanced Fiber Materials
·
2025
·
IF 21.3
Yang Yujie,Gao Xue,Zhang Yongfeng,Li Shengyou,Wu Haining,Xia Bing,Hao Yiming,Yu Beibei,Gao Xueli,Geng Dan,Guo Lingli,Qin Mingze,Wei Yitao,Xue Borui,Yang Shijie,Liu Qi,Nie Shihao,Qin Anhui,Liu Jinya,Lu Lei,Ma Teng,Luo Zhuojing,Huang Jinghui
Chronic hypoxia affects stem cell function during tissue repair. Thus far, the hypoxia-associated impact on periosteal stem cells (PSCs), the main contributor to bone repair, remains unknown, and a tailored oxygen modulation strategy for optimizing PSC function is lacking. Here, PSCs exhibit time-dependent proliferation and survival upon hypoxic exposure and a critical 48-h time-point is identified at which hypoxia transitions from beneficial to detrimental. Then, a photothermal-sensitive coaxial fiber-reinforced membrane containing oxygen and pravastatin is constructed to function as an intelligent oxygen supply system. Leveraging near-infrared light as an ON/OFF switch, the system noninvasively scales up oxygen release beginning 48 h post-implantation, counteracting prolonged hypoxia and mitigating its adverse effects on PSCs. The sustained release of pravastatin from the membrane accelerates early neovascularization both directly through its pro-angiogenic effect and indirectly by stimulating vascular endothelial growth factor secretion from PSCs, ensuring a continuous oxygen supply after exogenous oxygen exhaustion. Notably, pravastatin steers PSCs toward robust osteogenic differentiation and provides multifunctional bioactive cues for advanced bone regeneration in vivo. This time-scheduled approach to modulate oxygen supply noninvasively could be applicable beyond bone regeneration for hypoxia-related diseases and multi-tissue repair. Graphical
研究领域:
组织工程
·
再生医学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Tao Liang,Nan Jiang,Shuqi Zhou,Xinyi Wang,Yingke Xu,Chunsheng Wu,Dmitry Kirsanov,Andrey Legin,Hao Wan,Ping Wang
Light-addressable potentiometric sensor (LAPS) has been widely used in biomedical applications since its advent. As a member of the potentiometric sensors, ion-sensitive LAPS (ISLAPS) can be obtained by modifying ion selective sensing membrane on the sensor surface. Compared with the conventional ion-selective electrodes (ISEs) with liquid contact, the all-solid-state ISEs have more advantages such as easy maintenance, more convenient for miniaturization and practical applications. However, the commonly used ion-sensitive membrane (ISM) matrix like PVC has many limitations such as poor adhesion to silicone-based sensor and easy overflow of the plasticizer from the membrane. In this work, LAPS was combined with a variety of ionophore-doped all-solid-state silicone-rubber ISMs for the first time, to establish a program-controlled multiplexed ISLAPS system for physiological ions (Na + , K + , Ca 2+ and H + ) detection. The silicone-rubber ISMs have better adhesion to silicon-based sensors without containing plasticizers, which can avoid the plasticizer pollution and improve the long-term stability. A layer of poly(3-octylthiophene-2,5-diyl) (P3OT) was pre-modified on the sensor surface to inhibit the formation of an aqueous layer and improve the sensor lifetime. With the aid of a translation stage, the light spot automatically illuminated the detection sites in sequence, and the response of the four ions could be obtained in one measurement within 1 min. The proposed multiplexed ISLAPS has good sensitivity with micromolar limit of detection (LOD), good selectivity and long-term stability (more than 3 months). The results of the real Dulbecco's Modified Eagle Medium (DMEM) sample detection proved that the ISLAPS system can be used for the physiological ions detection, and is promising to realize a multi-parameter microphysiometer.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
TALANTA
·
2021
·
IF 6.057
Qichao Ye,Chen Men,Lili Tian,Yuxin Liu,Lei Zhan,Yuan Fang Li,Cheng Zhi Huang,Shu Jun Zhen
Conventional methods for the detection of the sulfur mustard poisoning metabolic marker, thiodiglycol (TDG), require expensive instruments and reagents as well as professional operators. To address these problems, a novel test strip based on a molecularly imprinted sensitive membrane (MIM) was developed in this work for point-of-care (POC) detection of TDG. The TDG test strip was prepared conveniently by coating molecular imprinted polymers (MIPs) on a nitrocellulose membrane. When the sample contained TDG, the MIPs could specifically bind with TDG. A great number of AuNPs (AuNPs) could then be adsorbed on the test strip via the formation of an Au–S bond between TDG and AuNPs, giving the test strip the obvious red color of AuNPs. In the absence of TDG, the test strip exhibited much lighter color because it could not adsorb AuNPs. By monitoring the color change of the test strip, TDG could be detected from 1.0 ng/mL to 100.0 μg/mL with a detection limit of 0.23 ng/mL (3σ) under the optimal conditions (the molar ratio of TDG to MAA was 1:2; the eluent was chloroform; the elution time was 50 min; the reaction time between MIPs and TDG was 15 min; the adsorption time of AuNPs was 40 min; the temperature of the reaction system was 35 °C). This method has excellent selectivity and has been used to detect TDG in urine, showing great potential for POC detection of TDG in clinical samples.
研究领域:
分析化学
·
生物传感器
·
即时检测
·
毒理学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2023
·Vol. 31
·期 4
·6203-6216
·
IF 3.8
Yuhao Chen,Cheng Li,Xiaozhan Yang
All fiber Michaelson interferometer cascaded fiber Bragg grating (FBG) sensor for simultaneous measurement of trace dimethyl methyl phosphate and temperature is proposed. One end of the four-core fiber (FCF) is spliced with a multimode fiber (MMF), the other end is flattened and evaporated with silver film to enhance reflection, and the Michelson interference structure is formed. The grating is engraved in the single-mode fiber (SMF) core and spliced with MMF, then the Michelson interference cascaded FBG, FBG-MMF-FCF sensor is obtained. The sensing film, MnCo2O4 is coated on the surface of FCF, and the structure, elemental composition and morphology of MnCo2O4 were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The sensitivity and the detection limit of DMMP are 86.44 dB/ppm and 0.1767 ppb, respectively. The response/recovery time is about 14/10 s. the temperature sensitivity can be compensated and calculated as 0.069 nm/°C. The sensor has good selectivity and stability, and has a good application prospect in high sensitivity detection of trace DMMP vapor.
研究领域:
光学传感
·
化学传感
·
光纤技术
·
干涉测量
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Lijuan Chen,Fan Chen,Gang Liu,Haoliang Lin,Yu Bao,Dongxue Han,Wei Wang,Yingming Ma,Baohua Zhang,Li Niu
Sweat pH is a critical indicator for evaluating human health. With the extensive attention on the wearable and flexible biosensing devices, the technology for the monitoring of human sweat can be realized. In this study, a sensitive, miniaturized, and flexible electrochemical sweat pH sensor was developed for the continuous and real-time monitoring of the hydrogen-ion concentration in human sweat. A flexible electrode was fabricated on the poly(ethylene terephthalate) (PET) substrate by a simple and low-cost screen-printing technology, which was based on the integration of fluoroalkyl silane-functionalized Ti3C2Tx (F–Ti3C2Tx) and the polyaniline (PANI) membrane technology instead of the traditional ion-sensitive membrane. The surface functionalization strategy for Ti3C2Tx with perfluorodecyltrichlorosilane can provide environmental stability. Functionalized Ti3C2Tx (F–Ti3C2Tx) was doped with PANI to obtain improved responsiveness, sensitivity, and reversibility. The constructed microsize, portable, and wearable F–Ti3C2Tx/PANI pH sensor aimed to real-time monitor the pH value of human sweat during exercise. On-body sweat pH monitoring for females and males, respectively, exhibited high accuracy and continuous stability compared with ex situ analyses. This study thus offers a facile and practical solution for developing a highly reliable MXene-based mini-type pH sensor to realize the online monitoring of human sweat pH.
研究领域:
材料科学
·
可穿戴技术
·
生物医学工程
·
电化学
·
传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）