Article
Chemistry, Physical
Mohit Mann, A. S. Rao, Ramesh C. Sharma
Summary: Standoff photoacoustic detection of explosives using quantum cascade laser can achieve a sensitivity of 2.0 μg/cm2. The experimental results show that the photoacoustic signals decrease with the increase in standoff range.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Acoustics
Thomas Strahl, Jonas Steinebrunner, Christian Weber, Jurgen Wollenstein, Katrin Schmitt
Summary: An innovative laser based photoacoustic gas sensing concept with intrinsic miniaturization potential was developed and investigated for methane trace gas detection. The concept uses an interband cascade laser to target a specific methane absorption line feature. A MEMS microphone is implemented as an intrinsically miniaturized PA cell, serving as the gas sensing volume, acoustic resonator, and sound transducer. The sensor shows sensitive methane detection and good long-term stability, with a noise equivalent concentration of 14 ppb.
Review
Chemistry, Physical
Jiangbin Wu, Nan Wang, Xiaodong Yan, Han Wang
Summary: Mid-infrared detectors based on low-dimensional materials have unique characteristics such as large bandgap tunability and optical polarization sensitivity. Future research directions include improving detector performance and exploring more unique properties.
Article
Acoustics
J. M. Rey, M. W. Sigrist
Summary: A robust and simple sensing scheme utilizing a Mid-Infrared Light Emitting Diode (MIR-LED) and based on Differential Mode Excitation Photoacoustic (DME-PA) spectroscopy is presented. The scheme takes advantage of the non-linearity in the excitation of various acoustic modes in a cylindrical resonant photoacoustic cell to provide high selectivity. The sensing device is tested using methane and hydrocarbon mixtures (propane, butane), achieving a detection limit of 25 ppm m-1 for methane.
Article
Chemistry, Analytical
Jonas Pangerl, Max Mueller, Thomas Rueck, Stefan Weigl, Rudolf Bierl
Summary: The study introduces a sensitive and compact photoacoustic setup based on ICL for detecting gaseous hydrocarbons, with a focus on methane, ethane, and acetylene. The sensor shows great potential for applications in trace gas analysis, with detection limits of 6.8 ppbV for methane, 2.3 ppbV for ethane, and 3.6 ppbV for acetylene.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Juho Karhu, Tuomas Hieta, Farshid Manoocheri, Markku Vainio, Erkki Ikonen
Summary: In this study, a high-sensitivity light-emitting diode (LED)-based photoacoustic NO2 sensor was demonstrated, achieving a sub-ppb detection limit and excellent stability through cantilever-enhanced photoacoustic detection and two-channel relative measurement. The results show great potential for the development of cost-effective and sensitive detectors for a variety of other trace gases, as LEDs are available at a wide selection of emission wavelengths.
Article
Optics
Li Zhengang, Si Ganshang, Ning Zhiqiang, Liu Jiaxiang, Fang Yonghua, Cheng Zhen, Si Beibei, Yang Changping
Summary: Gas detection is important in various fields, and photoacoustic spectroscopy is a suitable method due to its high sensitivity and fast response. This paper proposes a photoacoustic detection setup for carbon dioxide gas using a mid-infrared LED as the excitation light source. A T-type photoacoustic cell with long optical paths and acoustic resonance technology is developed. Experimental results show good linearity and stability of the setup.
ACTA OPTICA SINICA
(2022)
Article
Optics
Guojie Wu, Xue Wu, Zhenfeng Gong, Jiawei Xing, Yeming Fan, Junsheng Ma, Wei Peng, Qingxu Yu, Liang Mei
Summary: A novel miniaturized 3D-printed Y-type resonant photoacoustic cell (YRPAC) has been reported, which has higher sensitivity and smaller size compared to the conventional cell, providing a new solution for the development of photoacoustic spectroscopy systems.
Article
Optics
Chenyang Li, Min Guo, Bo Zhang, Chenxi Li, Beilei Yang, Ke Chen
Summary: A miniature single-fiber photoacoustic sensor was designed for the detection of trace amounts of methane gas, utilizing a communal cavity and single fiber to achieve a small cell volume. Experimental results confirmed the practicality of the sensor for detecting methane gas with a minimum detectable limit of 8.4 ppm.
OPTICS AND LASERS IN ENGINEERING
(2022)
Review
Chemistry, Analytical
Md Rejvi Kaysir, Jiaqi Song, Shazzad Rassel, Abdulrahman Aloraynan, Dayan Ban
Summary: The prevalence of diabetes is increasing worldwide, leading to severe health complications. The development of non-invasive techniques for blood glucose measurement based on photoacoustic spectroscopy (PAS) has shown great promise. However, there are challenges with penetration depth and interference from other components in blood. This review paper describes the basics of PAS in the MIR region, recent developments, challenges, and proposes improvements, including incorporating machine learning, to enhance glucose detection sensitivity.
Article
Biochemical Research Methods
Ryota Sasaki, Saiko Kino, Yuji Matsuura
Summary: A piezoelectric photoacoustic spectroscopy (PZT-PAS) system was developed for non-invasive measurement of biological tissue. It detects a single frequency of ultrasound induced by pulse-modulated mid-infrared laser light. PA spectra of optical phantom and biological samples were obtained, and the relationship between PA signal intensity and optical absorbance in the fingerprint region was analyzed to estimate the optical absorbance. The resonance vibration of induced ultrasound was utilized to increase the signal strength for biological tissue measurement. Consequently, a PA spectrum reflecting the absorption of components in biological tissues was obtained.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Optics
Fupeng Wang, Jinghua Wu, Yaopeng Cheng, Liyan Fu, Jianguo Zhang, Qiang Wang
Summary: In this study, a miniaturized differential photoacoustic cell is designed for the detection of CH4 and CO2. A new dual differential method is proposed to enhance the photoacoustic signal. The sensitivity of the detection is further improved by employing distributed feedback lasers and wavelength modulation spectroscopy.
Article
Chemistry, Analytical
Abdulrahman Aloraynan, Shazzad Rassel, Chao Xu, Dayan Ban
Summary: Diabetes is a global issue, and the development of noninvasive monitors is crucial for diabetes management. Optical spectroscopy, particularly using a single wavelength quantum cascade laser, has shown high accuracy and sensitivity in glucose monitoring. The integration of machine learning techniques has further improved the accuracy of glucose detection.
Article
Environmental Sciences
Jing Huang, Georgios Bekiaris, Temesgen Fitamo, Charlotte Scheutz, Sander Bruun
Summary: In this study, FTIRPAS was successfully used to predict the BMP values of urban organic waste samples from different sources in Denmark, showing high prediction accuracy. The results indicated a positive correlation with relatively easily degradable compounds, and a negative correlation with lignin and hemicellulose.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Tao Wu, Jiankang Cheng, Shifang Wang, Haijie He, Guannian Chen, Haoqing Xu, Silin Wu, James Lee
Summary: The main objectives of this study were to identify methane hotspots through spatial distribution tests and investigate the effects of rainfall, atmospheric pressure, ground temperature, and ambient methane concentration on methane emissions. Rainfall limited gas transport, resulting in more significant methane hotspots, while atmospheric pressure was negatively correlated with methane emission and ambient methane concentration had a significant positive linear correlation with methane flux.
Article
Engineering, Electrical & Electronic
B. Bierer, J. Kneer, J. Woellenstein, S. Palzer
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2016)
Article
Chemistry, Analytical
Alvaro Ortiz Perez, Vera Kallfass-de Frenes, Alexander Filbert, Janosch Kneer, Benedikt Bierer, Pirmin Held, Philipp Klein, Juergen Woellenstein, Dirk Benyoucef, Sigrid Kallfass, Ulrich Mescheder, Stefan Palzer
Article
Chemistry, Analytical
Stefan Knobelspies, Benedikt Bierer, Alvaro Ortiz Perez, Juergen Woellenstein, Janosch Kneer, Stefan Palzer
SENSORS AND ACTUATORS B-CHEMICAL
(2016)
Article
Chemistry, Analytical
Janosch Kneer, Stefan Knobelspies, Benedikt Bierer, Juergen Woellenstein, Stefan Palzer
SENSORS AND ACTUATORS B-CHEMICAL
(2016)
Article
Engineering, Electrical & Electronic
Louisa Scholz, Alvaro Ortiz Perez, Benedikt Bierer, Ponkanok Eaksen, Juergen Woellenstein, Stefan Palzer
IEEE SENSORS JOURNAL
(2017)
Article
Chemistry, Analytical
Haitao Gao, He Jia, Benedikt Bierer, Juergen Woellenstein, Yan Lu, Stefan Palzer
SENSORS AND ACTUATORS B-CHEMICAL
(2017)
Article
Engineering, Chemical
Benedikt Bierer, Hans-Joachim Naegele, Alvaro Ortiz Perez, Juergen Woellenstein, Philipp Kress, Andreas Lemmer, Stefan Palzer
CHEMICAL ENGINEERING & TECHNOLOGY
(2018)
Article
Chemistry, Analytical
Stefan Knobelspies, Benedikt Bierer, Alwin Daus, Alain Takabayashi, Giovanni Antonio Salvatore, Giuseppe Cantarella, Alvaro Ortiz Perez, Juergen Woellenstein, Stefan Palzer, Gerhard Troster
Article
Chemistry, Analytical
Alvaro Ortiz Perez, Benedikt Bierer, Louisa Scholz, Juergen Woellenstein, Stefan Palzer
Article
Instruments & Instrumentation
Benedikt Bierer, Dario Grgic, Olena Yurchenko, Laura Engel, Hans-Fridtjof Pernau, Martin Jaegle, Leonhard Reindl, Juergen Woellenstein
Summary: A novel wireless low-power catalytic gas sensor system based on non-precious metal catalyst for detecting methane and propane at 350 degrees C is presented, offering the opportunity to monitor complex infrastructure without using a power grid. By combining a microelectromechanical system (MEMS)-based sensor with a low-power radio system, the sensor system can be operated at lower temperatures compared to commercial pellistors, providing extensive characterization under exposure to methane and propane at concentrations common in industry.
JOURNAL OF SENSORS AND SENSOR SYSTEMS
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
B. Bierer, C. Dinc, H. Gao, J. Woellenstein, S. Palzer
SMART SENSORS, ACTUATORS, AND MEMS VIII
(2017)
Proceedings Paper
Engineering, Multidisciplinary
S. Knobelspies, B. Bierer, J. Woellenstein, J. Kneer, S. Palzer
Proceedings Paper
Engineering, Electrical & Electronic
B. Bierer, J. Kneer, J. Woellenstein, S. Palzer
SMART SENSORS, ACTUATORS, AND MEMS VII; AND CYBER PHYSICAL SYSTEMS
(2015)
Article
Instruments & Instrumentation
Olena Yurchenko, Hans-Fridtjof Pernau, Laura Engel, Benedikt Bierer, Martin Jaegle, Juergen Wollenstein
Summary: Differential thermal analysis (DTA) was used to investigate the effect of particle size and morphology of cobalt (III/IV) oxide on its thermal response to methane exposure. The results showed that particle size and shape significantly impact the thermal response, with Co3O4 catalysts with small particles and irregular shapes exhibiting higher responses.
JOURNAL OF SENSORS AND SENSOR SYSTEMS
(2021)
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)
