Nanomaterials
·
2024
·Vol. 14
·期 22
·1835
·
IF 4.4
Chong Li,Ran Tao,Jinqiao Hou,Huanming Wang,Chen Fu,Jingting Luo
Ammonia (NH 3 ) gas is prevalent in industrial production as a health hazardous gas. Consequently, it is essential to develop a straightforward, reliable, and stable NH 3 sensor capable of operating at room temperature. This paper presents an innovative approach to modifying SnO 2 colloidal quantum dots (CQDs) on the surface of Ti 3 C 2 T x MXene to form a heterojunction, which introduces a significant number of adsorption sites and enhances the response of the sensor. Zero-dimensional (0D) SnO 2 quantum dots and two-dimensional (2D) Ti 3 C 2 T x MXene were prepared by solvothermal and in situ etching methods, respectively. The impact of the mass ratio between two materials on the performance was assessed. The sensor based on 12 wt% Ti 3 C 2 T x MXene/SnO 2 composites demonstrates excellent performance in terms of sensitivity and response/recovery speed. Upon exposure to 50 ppm NH 3 , the frequency shift in the sensor is −1140 Hz, which is 5.6 times larger than that of pure Ti 3 C 2 T x MXene and 2.8 times higher than that of SnO 2 CQDs. The response/recovery time of the sensor for 10 ppm NH 3 was 36/54 s, respectively. The sensor exhibited a theoretical detection limit of 73 ppb and good repeatability. Furthermore, a stable sensing performance can be maintained after 30 days. The enhanced sensor performance can be attributed to the abundant active sites provided by the accumulation/depletion layer in the Ti 3 C 2 T x /SnO 2 heterojunction, which facilitates the adsorption of oxygen molecules. This work promotes the gas sensing application of MXenes and provides a way to improve gas sensing performance.
研究领域:
材料科学
·
传感器
·
纳米技术
·
环境监测
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DOI
PubMed
高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2024
·Vol. 71
·期 10
·6336-6342
·
IF 2.9
Jianwen Song,Lei Liang,Xiao Yong,Xinpeng Chen,Shibu Zhu,Zuquan Wu
In this article, molybdenum disulfide (MoS
2
)/cellulose nanocrystal (CNC) nanocomposites are coated on silver electrodes of the quartz crystal microbalance (QCM) by the drop-coating method for humidity sensing. The performance of QCM humidity sensors of MoS
2
, CNC, and MoS
2
/CNC thin films is investigated in the relative humidity (RH) range of 11.31%–97.59%. The experimental results reveal that MoS
2
/CNC humidity sensor has high sensitivity (ca. 36.03 Hz/%RH), which is higher than CNC (ca. 1.25 times) and MoS
2
(ca. 2.5 times). Meanwhile, the sensor has excellent repeatability, high stability, and low humidity hysteresis (ca. 3.3%RH). Moreover, the Langmuir isotherm adsorption model is also used to investigate the humidity-sensitive mechanism of MoS
2
/CNC humidity sensors. In addition, MoS
2
/CNC humidity sensor can be well applicable for respiration monitoring which has good application prospect.
研究领域:
材料科学
·
传感技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Dangge Gao,Fangxing Wang,Chi Zheng,Bin Lv,Jianzhong Ma
Cotton textiles with persistent antibacterial qualities are crucial in halting the spread of bacteria and other infections. However, fugitive bacteria and drug-resistant pathogens have rendered tremendous challenges in the development of cotton fabrics with long-lasting antibacterial efficacy. The work aimed to innovatively propose a functional cotton fabric integrating intelligent bacteria-capturing and dual antibacterial properties for efficacious personal health management. The functional cotton fabric was created by modifying the surface of cotton fabric with the quaternized carboxymethyl chitosan (Q-CF) and then covalently grafting the silver@Zr-based porphyrin metal–organic skeleton (Ag@MOF-545) prepared via the “bottle-around-the-boat” method on the surface of Q-CF (AM/Q-CF). In this process, the functional cotton fabric could capture bacteria via positive charges on the surface of the quaternized carboxymethyl chitosan. Due to the synergistic effect of broad-spectrum antibacterial silver nanoparticles (AgNPs) and the visible light-driven antibacterial Zr-based porphyrin metal–organic skeleton (MOF-545), the metabolism of bacteria and drug-resistant strains was well inhibited, which endowed the AM/Q-CF with lasting dual antibacterial properties. After repeated laundering cycles, abrasion cycles, simulated sweat soaking, and long-term storage, the antibacterial rates of AM/Q-CF were over 85%. Altogether, the results provided a potential antibiotic-free alternative for the preparation of durable antibacterial cotton fabrics.
研究领域:
材料科学
·
微生物学
·
纺织工程
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Qijie Chang,Daofu Wu,Yanyi Huang,Chengyao Liang,Libo Liu,Huanbin Liu,Yong He,Qiang Huang,Jing Qiu,Xiaosheng Tang
Halide perovskites have recently emerged as potential humidity-detection materials due to their excellent chemical and physical properties. However, the toxicity of Pb and environmental instability of the lead halide perovskites restrict the application in humidity detection . Herein, a lead-free K 2 CuBr 3 microwires-based quartz crystal microbalance (QCM) humidity sensor was investigated, and the application in human respiratory monitoring was developed. Coupling the high humidity sensitivity of K 2 CuBr 3 with the high mass change sensitivity of QCM, the lead-free K 2 CuBr 3 coated QCM humidity sensor exhibited excellent logarithmic linearity response (R 2 = 0.98626, 11–95% RH). In addition, the sensor demonstrated excellent repeatability, fast response/recover time (10.63 s/4.31 s), and considerable stability. Moreover, the Fourier transform infrared spectra (FTIR) and Langmuir adsorption model were applied to reveal the corresponding humidity sensing mechanism. The results indicate the lead-free K 2 CuBr 3 -based QCM sensor reported in this work could be a promising candidate for real-time breath monitoring.
研究领域:
材料科学
·
传感技术
·
环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lingfeng Shen,Ning Sun,Rui Xu,Wei Sun,Li Wang
In this paper, the flotation separation of quartz and feldspar was studied with CaCl 2 as activators and mixed sodium oleate/ dodecylamine (NaOL/DDA) collectors under alkaline condition, and the action mechanism of mixed NaOL/DDA collectors on the quartz and feldspar surfaces were systematically explored. The results of micro-flotation test showed that there were 90.98% quartz and 13.08% feldspar were floated with 0.5 mmol/L CaCl 2 and 2.8 mmol/L mixed NaOL/DDA collectors with molar ratio of 8/1 at pH 10.0. And the artificial mixed minerals flotation manifested these two minerals were able to efficient separation with CaCl 2 and mixed NaOL/DDA collectors at pH 10 ∼ 11. These outcomes indicated that DDA could increase recovery of quartz obviously and reduce about a half dosage of NaOL (from 0.5 mmol/L to 0.25 mmol/L) in flotation under alkaline condition; Meanwhile, mixed NaOL/DDA collectors were able to decreased the flotation separation pH from 12 to 10 on quartz and feldspar. Infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results revealed that when NaOL collector was added alone, it could adsorb on activated quartz surface but hardly detected on feldspar surface at pH 10. However, they all were found on both quartz and felspar surface when mixed NaOL/DDA collectors were introduced as collectors. Quartz microcrystal balance with dissipation (QCM-D) experiment confirmed that mixed NaOL/DDA collectors showed a higher adsorption mass and more stable adsorption layer on quartz compared with NaOL was introduced as collector alone. In addition, whether CaCl 2 , NaOL or mixed NaOL/DDA, the adsorption mass on quartz sensor were larger than that on feldspar senor, which might cause difference of hydrophobicity on the surface of quartz and feldspar in flotation. The above experiments showed that the mixed NaOL/DDA collectors can significantly improve hydrophobic difference between quartz and feldspar after activating with CaCl 2 and expand the floated pH range of quartz compared with using NaOL as collector alone, which were efficient reagents to separate quartz and feldspar in flotation.
研究领域:
矿物加工
·
表面化学
·
材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Chengxu Lin,Chunhua He,Jianbin Lin,Chenyu Li,Bo Sun,Shilong Peng,Lingxian Kong,Shuang Xi,Zhiyong Liu,Guanglan Liao,Tielin Shi
Humidity sensor is crucial for broader applications like biomedicine and semiconductor fabrication. It is still a formidable challenge to achieve a humidity sensor with high sensitivity and anti-pollution ability. Inspired by horsefly eye, we propose a superhydrophilic CuO nanowires quartz crystal microbalance humidity sensor covered by micro-pit array, achieving outstanding self-cleaning properties. The physicochemical property of the sensing materials was characterized in situ by SEM, XRD, and XPS. The sensing characteristics of the specimen towards water molecules are studied by quartz crystal microbalance with dissipation monitoring, showing high sensitivity of 82.5±7.7 Hz/%RH. Molecular dynamic simulation and Brunauer-Emmett-Teller nitrogen sorption analysis are conducted for revealing the superhydrophilicity mechanism of CuO nanowires. Then a CuO nanowires humidity-sensing model is established, verified by both theoretical calculations and experiments. A smart non-contact sensing system based on the sensors was constructed, and the humidity intensity of human breath or fingers were detected. Our works demonstrate brilliant properties of the superhydrophilic CuO nanowires for non-contact sensing applications, providing new solutions for medical health monitoring, industrial environment detection, and human-computer interaction, etc.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2013
·
IF 4.187
Yunchao Long,Tao Wang,Lvdan Liu,Guangming Liu,Guangzhao Zhang
By use of a quartz crystal microbalance with dissipation (QCM-D), we have investigated the specific ion effect on the growth of poly(sodium 2-acrylamido-2-methylpropanesulfonate)/poly(diallyldimethylammonium chloride) multilayer at a salt concentration as low as 2.0 mM in water–methanol mixtures. QCM-D results demonstrate that specific ion effect can be observed in methanol and water–methanol mixtures though it is negligible in water. Moreover, the specific ion effect is amplified as the molar fraction of methanol (xM) increases from 0% to 75% but is weakened again with the further increase of xM from 75% to 100%. Nuclear magnetic resonance measurements reveal that the counterion–polyelectrolyte segment interactions may not account for the observed ion specificity. By extending the Collins’ concept of matching water affinities to methanol and water–methanol mixtures, we suggest that the ion–solvent interactions and the resulted counterion–charged group interactions are responsible for the occurrence of the specific ion effect. The conductivity measurements indicate that water and methanol molecules may form complexes, and the change of relative proportion of complexes with the xM causes the amplification or weakening of the specific ion effect.
研究领域:
材料科学
·
物理化学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yubiao Zhang,Dongzhi Zhang,Hao Zhang,Yan Wu,Wenzhe Liu,Zijian Wang,Guangshuai Xi
There is a growing demand for reliable and portable humidity detection in both medical and industrial applications. The quartz crystal microbalance (QCM) is a high-performance sensor for gas and moisture detection and has been extensively studied in recent years. In this study, titanium dioxide with nanoflower-like structure was synthesized and doped with ethyl cellulose to modulate the microstructure of ethyl cellulose/titanium dioxide composite, and constructed ethyl cellulose/titanium dioxide composite thin-film QCM humidity sensor. A vector network analyzer was utilized to evaluate the mechanical stability of the sensor devices. The EC/TiO 2 QCM humidity sensor demonstrated low hysteresis (2.49% RH), and exhibit good stability, repeatability, selectivity, and short response/recovery time (18.8 s/2.2 s). Furthermore, the nanoflower-like structure of TiO 2 is an important factor influencing the humidity sensitivity of the QCM sensor. The water molecule adsorption process on the QCM sensor was analyzed using the Langmuir adsorption isotherm model. This work confirmed that the EC/TiO 2 QCM humidity sensor holds strong potential for use in wearable respiratory monitoring and non-contact triggering applications.
研究领域:
生物医学工程
·
传感器技术
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Dongzhi Zhang,Dandi Zhou,Haoyang Mi,Zijian Wang,Pengfei Zhang,Guangshuai Xi
A quartz crystal microbalance (QCM) sensor based on tungsten disulfide (WS 2 ) and polyacrylic acid (PAA) nanocomposite coating was introduced for trimethylamine (TMA) gas molecule detection. WS 2 nanosheets were prepared by hydrothermal method and polyacrylic nanoparticles were prepared by solution polymerization . WS 2 , PAA and WS 2 /PAA sensors were prepared by spraying. The macrostate , microstructure and elementary composition of the nanomaterials were verified by characterization methods. The prepared WS 2 is rich in functional groups such as hydroxyl , carboxyl and amino groups, which effectively enhances the synergy effect of multiple sensing materials and the interaction with target molecules. The sensor performance was tested at 25 °C and 33 % RH. Experimental results show that WS 2 /PAA composite sensor has better trimethylamine sensing performance than single-material sensor, such as shorter response/recovery time (27/33 s@1 ppm) and better selectivity . The frequency shift characteristics of the sensor were verified by the vector network analyzer and the figures of merit of the sensors were calculated. Experimental results show that WS 2 /PAA composite sensor based on two-dimensional (2D) transition metal sulfide provides a reliable way for the detection of trimethylamine. In addition, an app was designed to judge the freshness of seafood.
研究领域:
食品科学
·
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Lingfei Gao,Hao Li,Xiangyang Dong,Wei Li,Hongbing Deng
Respiratory humidity is an important indicator that can reflect respiratory disorders and is easily accessible in daily life, thus attracting attention in non-contact home respiratory monitoring systems. In this work, a high-sensitivity quartz crystal microbalance (QCM) humidity sensor based on a chitosan/carboxymethylated multiwalled carbon nanotubes composite coating is developed with a response time of 36 s and a recovery time of 38 s. The humidity variations from 11 to 97 % can be detected while the wet hysteresis is 0.95 % RH. The sensor also exhibits good repeatability and stability. The physicochemical characterizations of the materials reveal the mechanism of the rapid humidity response, i.e., compared to the physically blended CS with MWCNT, the crosslinking CS-MWCNT formed the new intercalation by stronger hydrogen and amide bonding, which leads to the homogeneous coverage of CS on MWCNT, exposing more active sites and facilitating the binding rate of water molecules. Combined with respiration monitoring, the sensor is able to accurately monitor human respiration rate and depth in real time, effectively predicting and differentiating between different types of obstructive sleep apnea syndromes, providing a fast and reliable solution for daily health monitoring.
研究领域:
生物医学工程
·
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 11
·1275
·
IF 2.935
Kun Shang,Siyu Song,Yaping Cheng,Lili Guo,Yuxin Pei,Xiaomeng Lv,Teodor Aastrup,Zhichao Pei
A novel approach for preparing carbohydrate chips based on polydopamine (PDA) surface to study carbohydrate–lectin interactions by quartz crystal microbalance (QCM) biosensor instrument has been developed. The amino-carbohydrates were immobilized on PDA-coated quartz crystals via Schiff base reaction and/or Michael addition reaction. The resulting carbohydrate-chips were applied to QCM biosensor instrument with flow-through system for real-time detection of lectin–carbohydrate interactions. A series of plant lectins, including wheat germ agglutinin (WGA), concanavalin A (Con A),Ulex europaeusagglutinin I (UEA-I), soybean agglutinin (SBA), and peanut agglutinin (PNA), were evaluated for the binding to different kinds of carbohydrate chips. Clearly, the results show that the predicted lectin selectively binds to the carbohydrates, which demonstrates the applicability of the approach. Furthermore, the kinetics of the interactions between Con A and mannose, WGA andN-Acetylglucosamine were studied, respectively. This study provides an efficient approach to preparing carbohydrate chips based on PDA for the lectin–carbohydrate interactions study.Keywords:polydopamine;amino-carbohydrates;carbohydrate chips;QCM biosensor;carbohydrate–lectin interactions
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Zhijia Li,Muzhou Teng,Ronghua Yang,Feiyan Lin,Yu Fu,Weiqiang Lin,Judun Zheng,Xiaoping Zhong,Xiaodong Chen,Bin Yang,Yuhui Liao
Humidity sensing is a promising method for monitoring respiration and diagnosing diseases. However, the fabrication of a semiconductor-based humidity sensor with fast response/recovery times and high sensitivity even under wet conditions remains challenging. In this study, a quartz crystal microbalance (QCM) humidity sensor was fabricated using Sb-doped WO 3 nanocrystals via a simple solvothermal method . Sb doping increased the number of oxygen vacancies and led to a narrow band gap. It also restricted the further growth of WO 3 and provided more adsorption sites, which resulted in a small particle size and large specific surface area. The device displayed a wide range of relative humidity (0–85%) with fast response and recovery times (10 and 1.6 s, respectively) and good long-term stability. After 100 cycles of wet treatment, the response of the sensor recovered to 92.2%, showing good self-recovery ability. The Sb/WO 3 -based QCM sensors were applied to the sensitive monitoring not only of respiratory humidity but also of moisture changes of a wound; the latter had never previously been performed using a QCM. This study therefore provides valuable insights for the development of integrated wound-microenvironment monitoring.
研究领域:
材料科学
·
医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）