Optical spectroscopy has a broad scientific basis in chemistry, physics, and material science,
with diverse applications in medicine, pharmaceuticals, agriculture, and environmental …

Photoacoustic spectroscopy (PAS) combines the advantages of high sensitivity, high
specificity and zero background, which is very suitable for trace gas detection. Cantilever …

Acetic acid (CH3COOH) detection with high selectivity at low temperatures is significant due
to its wide applications in the chemical, medical, and catering industries. Chemiresistive gas …

Finding a non-invasive, painless and simple method for monitoring of health parameters and
early detection of physiological disorders is of utmost importance in today's world. Breath …

Photoacoustic spectroscopy (PAS) is an ultrasensitive method for gas sensing, which
usually using a capacitive microphone as a signal detector. However, the electric nature of …

As an n-type metallic oxide semiconductor with a wide bandgap of 3.37 eV, ZnO suffers from
low sensitivity for gas sensor application. In order to improve the gas sensitivity, Zn-metal …

In this study, SnO 2 was prepared by simple hydrothermal method and a series of g–C 3 N 4–
SnO 2 composite were prepared through sonication mixing method. The materials were …

As an n-type metal oxide semiconductor with a wide band gap (3.37 eV), ZnO has been
widely used as gas sensors, but pure ZnO gas sensors suffer from low sensitivity. In this …

To overcome the scarcity and costliness of noble metal dopants, carbon (C) doping, as a low-
cost alternative, was achieved by absorbent cotton when the alpha (α)-Fe 2 O 3 …

A multiple reflections-enhanced fiber-optic photoacoustic (PA) gas sensor for gas micro-
leakage is introduced. Multiple reflections of the excitation laser occur on the inner surface of …