Article
Nanoscience & Nanotechnology
Yunxia He, Lin Tao, Jing Li, Mingjie Wu, Preeyaporn Poldorn, Davoud Dastan, Sedigheh Abbasi, Shuai Nie, Xitao Yin, Qi Wang
Summary: Chemical resistive gas sensors based on p-n heterojunctions have been proven to provide reliable gas selectivity, but the effects of heterojunctions on sensor selectivity are still unclear. In this study, SnO2(100)/ CoO(110) and CoO(110)/ SnO2(100) nanomaterials were synthesized to investigate their sensing properties for H2 and CO gases. The results showed that the heterojunctions exhibit an n-type response to CO and a p-type response to H2 based on adsorption energy and density of states analysis. The study provides valuable theoretical insight into the selective adsorption of reducing gases by heterojunctions.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Physical
Yanhui Sun, Jing Wang, Haiying Du, Xiaogan Li, Chen Wang, Tengyue Hou
Summary: The addition of zeolite on the surface of metal oxides enhances the selectivity of gas sensors, and the synthesis of SnO2/ZSM-5 composite nanofibers can improve sensor sensitivity and selectivity to formaldehyde. The interface between the two materials plays a significant role in enhancing sensor properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xi-Tao Yin, Sai-Sai Wu, Davoud Dastan, Shuai Nie, Ying Liu, Zhi-Gang Li, Yan-Wen Zhou, Jing Li, Abdessamad Faik, Ke Shan, Zhicheng Shi, Maryam Abbasi Tarighat, Xiao-Guang Ma
Summary: In this study, SnO2-Mn3O4 nanocomposites were prepared and characterized for gas sensing properties. It was found that the composites exhibit n-type response to H-2 and CO for a Sn to Mn molar ratio greater than 1:2.33, and p-type response for a molar ratio smaller than 1:2.33. Interestingly, a reverse sensing behavior was observed when the ratio was 1:2.33.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Analytical
Jihee Kim, Masoud Nazarian-Samani, Jihyun Lee, Sang-kil Lee, Kyu Hyong Lee, Ji Hee Pi, Yu Jin Kim, Sanghyeon Lee, Wooyoung Lee
Summary: High selectivity and fast response are crucial for protecting human health in dangerous environments. The p-n SnO/SnO2 heterostructure, with its synergistic effect on semiconducting properties and interfacial electric field, shows excellent sensing performances. It has a high response rate, fast response time, and superior selectivity compared to other target gases. The presence of oxygen vacancies in the SnO/SnO2 heterostructure is supported by Raman and EPR results, and the role of these vacancies as an effective electron donor for adsorbed oxygen molecules and NO2 target gas is described by XPS and ToF-SIMS analyses. The direct formation of oxygen vacancies in SnO/SnO2 heterostructures is an important reference for the development of high-performance NO2 gas sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Materials Science, Ceramics
Xi-Tao Yin, Zhi-Yu Yang, Davoud Dastan, Ying Liu, Xiao-Ming Tan, Xiao-Chun Gao, Yan-Wen Zhou, Jing Li, Xiao-Guang Ma
Summary: In this study, Pt loaded SnO2-Co3O4 composite was successfully fabricated using a hydrothermal method and applied to gas sensing for the first time. The results showed that the composite exhibited significantly improved response and response time to hydrogen gas compared to pristine SnO2. Additionally, the material also demonstrated excellent sensing performance including selectivity for detecting H2 gas. The improved sensing properties were attributed to the synergistic effect of the spillover effect of Pt element and the formation of p-n junction.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Swapnali B. Dhage, Vithoba L. Patil, Pramod S. Patil, Jungho Ryu, Deepak R. Patil, Yuvraj S. Malghe
Summary: CuO-SnO2 nanocomposites were successfully synthesized and studied for their potential as CO gas sensors. The thermal stability and gas sensitivity of the nanocomposites were confirmed, showing excellent repeatability and sensitivity towards CO gas. The XRD results indicated pure phase formation of CuO-SnO2 heterostructure with a band-gap of 2.63 eV.
Article
Chemistry, Multidisciplinary
Hyoungwon Park, Jae-Hun Kim, Dustin Vivod, Sungil Kim, Ali Mirzaei, Dirk Zahn, Changkyoo Park, Sang Sub Kim, Marcus Halik
Summary: This study enhanced the sensing capabilities of semiconducting metal oxide-based gas sensors through a new post-modification method, improving gas selectivity; the chemical-affinity-driven interaction between SAM and gas molecules enabled selective gas sensing.
Article
Chemistry, Analytical
Wei Wang, Qinyi Zhang, Ruonan Lv, Dong Wu, Shunping Zhang
Summary: This study successfully enhanced the selectivity to formaldehyde by modifying the surface of metal oxide semiconductors with a zeolite layer, and controlled the thickness of the layer to achieve outstanding performance.
Article
Nanoscience & Nanotechnology
Yong Tan, Jun Zhang
Summary: In this work, an ethanol gas sensor based on Co-doped SnO2 nanobelts was fabricated. The Co-doped SnO2 nanobelts were prepared using chemical vapor deposition method and gas sensors were prepared using powder screen printing technology. The gas sensor based on Co-doped SnO2 nanobelts exhibited better gas response and shorter response time and recovery time compared to the gas sensor based on pure SnO2 nanobelts.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Physical
M. S. Mamabolo, Z. P. Tshabalala, H. C. Swart, G. E. Mphaphuli, T. K. Hillie, D. E. Motaung
Summary: “”Development of carbon monoxide (CO) gas sensors is crucial for prompt detection due to its poisonous behavior. In this study, tin dioxide (SnO2) and vanadium pentoxide (V2O5) nanostructures were prepared using a hydrothermal method with different bases. The results showed that using NaOH as a base improved the crystalline structure of SnO2 and enhanced the performance of the sensor.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Xiaoning Meng, Mingshu Bi, Qiuping Xiao, Wei Gao
Summary: This study evaluates the performance of different hydrogen sensing materials and finds that Pd-modified SnO2 nanoparticles exhibit enhanced H-2 sensing capabilities at lower working temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Lili Li, Chenguang Wang, Zhihua Ying, Wei Wu, Yongqian Hu, Weihuang Yang, Weipeng Xuan, Yang Li, Fei Wen
Summary: This paper reported a low concentration CO gas sensor based on SnO2 modified graphene nanocomposite at 25 degrees C. The SnO2/graphene nanocomposite exhibited higher CO gas sensing performance than pure SnO2, showing a high response to CO at 25 degrees C, shorter response and recovery times, excellent repeatability and stability. The excellent CO sensing performance of the composite is attributed to graphene's ability to provide a large surface area for adsorption sites and prevent the disagglomeration of SnO2 nanoparticles.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Chemistry, Analytical
Hwaebong Jung, Junho Hwang, Yong-Sahm Choe, Hyun-Sook Lee, Wooyoung Lee
Summary: This study presents a breath hydrogen analyzer based on a Pd-coated SnO2 nanorods (Pd-SnO2 NRs) sensor integrated into a miniaturized gas chromatography column. The device demonstrates the ability to accurately detect hydrogen in real-time using a small volume of breath sample. Results show that the Pd-SnO2 NRs sensor exhibits superior selectivity and sensitivity compared to other semiconducting metal oxides.
Article
Chemistry, Analytical
Chunyan Li, Kyusung Kim, Teruaki Fuchigami, Toru Asaka, Ken-ichi Kakimoto, Yoshitake Masuda
Summary: In this study, a hybrid sensor material with loose structure was developed by loading Nb2O5 nanoparticles onto SnO2 nanosheets for the detection of low-concentration acetone gas. The spiky Nb2O5 exhibited higher response than the Nb2O5 nanorods. Gas sensors based on the hybrid structure showed remarkable enhancement in acetone sensing performance, with high response, low detection limit, and good selectivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Physical
Snehanjan Acharyya, Plaban Kumar Bhowmick, Prasanta Kumar Guha
Summary: Accurate and selective detection of target gas/volatile organic compounds (VOCs) is achieved through a combination of nanomaterials-based chemiresistive gas sensors and machine learning techniques. The use of different metal nanoparticles for surface decoration leads to sensitive and diverse sensing patterns among VOCs. The application of machine learning models, particularly a deep neural network model with time series response sequence, enables qualitative and quantitative detection of VOCs with high accuracy and fast prediction time.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Mengmeng Guo, Na Luo, Yueling Bai, Zhenggang Xue, Qingmin Hu, Jiaqiang Xu
Summary: A porous heterostructure WO3-C/In2O3 was designed and prepared for a miniature H2 sensor, which showed higher response value, lower operating temperature, fast response-recovery speed, and low limit of detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Feng Hu, Hui Hu, Yuting Li, Xiaohui Wang, Xiaowen Shi
Summary: Arsenic contamination in water bodies is a significant health risk. This study developed a chitosan-catechol modified electrode for rapid and accurate detection of trace amounts of arsenic. The modified electrode demonstrated good detection capability and resistance to ionic interference, making it suitable for in situ detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Yantao Zhang, Qian Liu, Tao Tian, Chunhua Xu, Pengli Yang, Lianju Ma, Yi Hou, Hui Zhou, Yongjun Gan
Summary: In this study, a lysosome-targeting buffering fluorogenic probe (Lyso-BFP) was designed and synthesized, demonstrating excellent photostability, pH specificity, and responsiveness to lysosomal acidification in living cells. The performance of Lyso-BFP in pH sensing was attributed to the inhibition of the photo-induced electron transfer process. Lyso-BFP allowed for wash-free imaging and long-term real-time monitoring of lysosome pH changes based on its off-on fluorescence behavior and buffer strategy.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Wei Cai, Wenbo Sun, Jiayue Wang, Xiaokui Huo, Xudong Cao, Xiangge Tian, Xiaochi Ma, Lei Feng
Summary: In this study, a near-infrared fluorescent probe HCBG was developed for imaging of alpha-GLC. HCBG exhibited excellent selectivity and sensitivity towards alpha-GLC in complex bio-samples, and showed good cell permeability for in situ real-time imaging. Through the high-throughput screening system established by HCBG, a natural alpha-GLC inhibitor was successfully isolated and identified. This study provides a novel fluorescence visualization tool for discovering and exploring the biological functions of diabetes-related gut microbiota, and a high-throughput screening approach for alpha-GLC inhibitor.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Trey W. Pittman, Xi Zhang, Chamindie Punyadeera, Charles S. Henry
Summary: Heart failure is a growing epidemic and a significant clinical and public health problem. Researchers have developed a portable and affordable diagnostic device for heart failure that can be used at the point-of-care, providing a valid alternative to current diagnostics approaches.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Anders O. Tjell, Barbara Jud, Roland Schaller-Ammann, Torsten Mayr
Summary: An optical hydrogen peroxide sensor based on catalytic degradation and the detection of produced oxygen is presented. The sensor offers higher resolution and better sensitivity at lower H2O2 concentrations. By removing O2 from the sample solution, a more sensitive O2 sensor can be used for measurement. The sensor has been successfully applied in a flow-through cell to measure H2O2 concentration in different flow rates.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Seong Jae Kim, Ji-hun Jeong, Gaabhin Ryu, Yoon Sick Eom, Sanha Kim
Summary: Surface-enhanced Raman spectroscopy (SERS) is a high-sensitivity, label-free detection method with various analytical applications. Researchers have developed a hydrophobic SERS substrate based on engineered carbon nanotube arrays (CNT-SERS) and studied the role of structural design at both micro and nanoscales. The substrate demonstrated controlled self-enrichment capability and enhanced sensitivity, with a significant increase in the SERS signal. The study also proposed a theoretical model and a concentration strategy inspired by plants for analyte deposition on microarrays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Dan Zhao, Renjun Jiang, Xiaoqiang Liu, Subbiah Alwarappan
Summary: In this study, a novel ternary composite material was constructed by assembling cerium vanadate nanorods on reduced graphene oxide-microcrystalline cellulose nanosheets, and it was used for real-time monitoring of the concentration of superoxide anions in vivo. The ternary composite showed excellent conductivity, large surface area, and abundant active sites, leading to a wider linear range, high sensitivity, low detection limit, and fast response time for superoxide anion detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Tengfei Wang, Liwen Wang, Guang Wu, Dating Tian
Summary: In this study, a covalent organic framework material TaTp-COF with porous and uniform spheres was successfully prepared via hydrothermal reaction, and it was found to significantly enhance the aggregation-induced emission (AIE) of berberine. The unique emission properties of berberine on TaTp-COF were studied and utilized for the sensitive detection of berberine.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Lin Li, Yilei Ding, Lei Xu, Shuoran Chen, Guoliang Dai, Pengju Han, Lixin Lu, Changqing Ye, Yanlin Song
Summary: In this study, a novel TTI based on a ratiometric fluorescent nanosensor is designed, which has the advantages of high accuracy and low cost. Experimental and theoretical investigations confirm its pH responsiveness and demonstrate its good sensitivity and reliability. By monitoring the total volatile basic nitrogen, this TTI can accurately predict food spoilage and can be adaptively modified for different types of food. The TTI based on this nanosensor enables visual monitoring of food quality.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Fangju Chen, Xueting Wang, Wei Chen, Chenwen Shao, Yong Qian
Summary: Lung cancer is the second most common malignant tumor worldwide. Drug resistance in lung cancer leads to treatment failure and recurrence in majority of patients. This study developed a fluorescent prodrug that can be activated in cancer cells to release drugs, and its signal can be tracked by imaging. It shows a unique autophagy-driven ferroptosis effect, indicating its potential for targeting drug-resistant cancer cells.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Weichao Li, Qiming Yuan, Zhangcheng Xia, Xiaoxue Ma, Lifang He, Ling Jin, Xiangfeng Chu, Kui Zhang
Summary: This study developed a high-performance gas sensor for formaldehyde detection by modifying ZnSnO3 with ZnO QDs and SnO2 QDs. The modified sensor showed improved sensing response and lower working temperature. The presence of ZnO QDs formed rich heterojunctions, increased surface area, and provided oxygen deficiency for formaldehyde sensing reaction, thus enhancing the sensor performance. This research provides an alternative method to enhance the sensing properties of MOS by QDs modification.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Joung-Il Moon, Eun Jung Choi, Younju Joung, Jin-Woo Oh, Sang-Woo Joo, Jaebum Choo
Summary: A novel nanoplasmonic substrate was developed for biomedical applications, which showed strong hot spots for detecting biomarkers at low concentrations. The substrate, called AuNPs@M13, was made by immobilizing 60 nm gold nanoparticles onto the surface of an M13 bacteriophage scaffold. It demonstrated higher sensitivity and lower limit of detection compared to commercially available assays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Ning Li, Ya Zhang, Ying Xu, Xiaofang Liu, Jian Chen, Mei Yang, Changjun Hou, Danqun Huo
Summary: The molecular subtype of breast cancer guides treatment and drug selection. Invasive tests can promote cancer cell metastasis, so the development of high-performance, low-cost diagnostic tools for cancer prognosis is crucial. Liquid biopsy techniques enable noninvasive, real-time, dynamic, multicomponent, quantitative, and long-term observations at the cellular, genetic, and molecular levels. A Cu-Zr metal-organic framework (MOF) nanoenzyme with monatomic Cu attachment has been synthesized and proven to have high catalytic performance. The sensor constructed using this nanoenzyme shows potential for accurate classification of breast cancer serum samples.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Jeongmin Kim, Hyemin Kim, Seunghyun Park, Hyeonaug Hong, Yong Jae Kim, Jiyong Lee, Jaeho Kim, Seung-Woo Cho, Wonhyoung Ryu
Summary: This study presents a method to fabricate independently functioning microneedle (MN) electrodes with narrow intervals for high precision electrochemical sensing. The optimized mixture of photocurable polymer and single-wall carbon nanotubes was used to mold single composite MNs, which were then attached to pre-patterned electrodes. Plasma etching and electropolymerization were performed to enhance the electrochemical activity, and Prussian blue and glucose oxidase were electrodeposited on the MNs for glucose detection. The MN electrodes showed good sensitivity and linearity, and the feasibility of glucose detection was demonstrated in an in vivo mouse study.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)