Results 71 to 80 of about 3,337,551 (141)
Sensors, 2015 A sensitive trace gas sensor platform based on quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. A 1.395 μm continuous wave (CW), distributed feedback pigtailed diode laser was used as the excitation source and H2O was selected as the ...
Yufei Ma +5 more
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ChemPhotoChem, Volume 9, Issue 12, December 13, 2025.Tetra‐ortho‐fluoroazobenzene hybrids bound to carbon nanodots (CNDs) are prepared by covalent amide coupling. These show reversible switching between trans and cis using visible light (448 nm/530 nm), while retaining emission. The hybrids are nontoxic to cells and enable optical stimulation and offering potential for advanced light‐controlled ...
Paul P. Debes +14 more
wiley +1 more source
Aggregate, Volume 6, Issue 12, December 2025.An asymmetric heptamethine cyanine photosensitizer, Cyp‐TPE, is designed to break molecular symmetry and form ordered nanoaggregates, resulting in ultrahigh ROS generation and synergistic photothermal/photodynamic activity. It further triggers ferroptosis and lysosomal dysfunction, providing a potent aggregate‐based theranostic platform for imaging ...
Mengyuan Cui +6 more
wiley +1 more source
Nature Communications, 2017 Quartz-enhanced photoacoustic spectroscopy is a sensitive gas detection method whereby radiation-induced sound waves from gas absorption are detected. Here, Wuet al. use the beat frequency between a modulated laser and a tuning fork resonance to increase
Hongpeng Wu +9 more
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Advances in metals and metal hybrids‐based gas sensors and their applications
Rare Metals, Volume 44, Issue 12, Page 9363-9413, December 2025.Graphical abstract Abstract As a kind of node on the Internet of Things, gas sensor is specifically utilized for detecting gaseous chemical species and humidity. Functioning as a kind of discrete electronic components, gas sensors have been extensively implemented in many fields, including agricultural production, public safety, healthcare activity ...
Danyao Qu +7 more
wiley +1 more source
Quartz enhanced photoacoustic spectroscopy based on an external cavity quantum cascade laser [PDF]
, 2018 Mid-infrared laser spectroscopy is a powerful analytical tool for trace gases detection. In this study, a spectroscopic system based on an external cavity quantum cascade laser (ECQCL) and quartz enhanced photoacoustic spectroscopy (QEPAS) was developed ...
Zhou, S., Li, J., He, T., Xu, L.
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, 2022 In this work, we study the non-radiative energy relaxation rate of methane isotopologues in the mid-infrared spectral range, at about 7.719 μm. We exploited quartz-enhanced photoacoustic spectroscopy to measure the photoacoustic signal at different ...
Sampaolo A. +9 more
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Small Science, Volume 5, Issue 11, November 2025.This article discusses the preparation methods, structural engineering, and key properties of transition metal nitrides, as well as their versatile applications in supercapacitors, rechargeable batteries, electrocatalytic and photocatalytic processes, and solar cell technologies.
Narasimharao Kitchamsetti +2 more
wiley +1 more source
Rational Design and Fabrication of MEMS Gas Sensors With Long‐Term Stability: A Comprehensive Review
Advanced Science, Volume 12, Issue 39, October 20, 2025.Recent advances in microelectromechanical systems (MEMS) gas sensors are reviewed, emphasizing strategies to enhance long‐term stability, including chemical modification of sensing films and device structural optimization. Key challenges and future opportunities are also highlighted.
Chao Zhang +6 more
wiley +1 more source
Quartz-enhanced photoacoustic spectroscopy
, 2003 Methods and apparatus for detecting photoacoustic signals in fluid media are described. The present invention differs from conventional photoacoustic spectroscopy in that rather than accumulating the absorbed energy in the fluid of a sample cell, the ...
Kosterev, Anatoliy A.
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