With the recent development of deep ultraviolet (DUV) light emitting diodes (LEDs) comes the possibility of targeting absorption bands of several gases, including sulfur dioxide (SO). SO has strong absorption bands in the 300 nm spectral region. The low cost and small size of DUV LEDs, coupled with their spectral coverage, makes them viable sources for new gas sensors. Here, we demonstrate the capability to use absorption spectroscopy with a balanced detection scheme using a 300 nm DUV LED source for SO detection at concentrations ranging from less than 1 ppm to 50 ppm.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1177/0003702816665126 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Nano structural regulation of lignin and evaluation of its ultraviolet light absorption properties through quantum chemistry calculations.
Int J Biol Macromol
January 2025
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
Lignin, a biomass-derived material containing chromophores, possesses the potential to serve as a versatile organic ultraviolet (UV) light screening agent. By employing quantum chemical computation techniques, an amphoteric deep eutectic solvent (DES) based on sulfamic acid was purposefully designed and engineered to create a solvent system tailored for the nanoparticle formation and functionalization of lignin. As confirmed by experimental evidence, the size of the modified lignin nanoparticles (LNPs) varies from 168.
View Article and Find Full Text PDFQuantitative study of microplastic degradation in urban hydrosystems: Comparing in situ environmentally aged microplastics vs. artificially aged materials generated via accelerated photo-oxidation.
J Hazard Mater
January 2025
Université Claude Bernard Lyon 1, LEHNA UMR 5023, CNRS, ENTPE, F-69518, Vaulx-en-Velin, France.
The degradation of plastic waste is a major research challenge due to the adverse impacts of microplastic weathering on the environment and ecosystems. As a major source of plastic contamination comes from urban hydrosystems, studying MP degradation prior to their environmental dissemination is crucial. Through a combination of field sampling and laboratory experiments, this study provides a thorough statistical degradation comparison analysis between polyethylene in situ environmentally aged microplastics and artificially aged films.
View Article and Find Full Text PDFA HTO-Type Nonlinear Optical Fluorophosphate with Ultrawide Bandgap.
Small
January 2025
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Compounds having hexagonal tungsten oxides (HTO) topology are of intense research interests owing to their potential functional properties, such as nonlinear optical (NLO) performances. However, most of the reported HTO-type compounds exhibit narrow optical bandgaps because of the d-d electronic transition of compositional d transition metals and lone pair electrons effect of Se/Te, which hinder their applications in the high-energy field, such as deep-ultraviolet (deep-UV) region. In this work, a new fluorophosphate, (NH)[ScF(PO)](POF) exhibiting HTO-topological structures is reported.
View Article and Find Full Text PDFExtraction, Isolation and Purification of Catechins and their Applications.
Med Chem
January 2025
School of Pharmacy, Changzhou University, Changzhou, 213164, China.
Catechins, the main active components of tea polyphenols, boast remarkable antioxidant activities because of their unique structures. This translates to a range of potential health benefits, including fighting antibacterial, inflammation, and even cancers. However, extracting these beneficial compounds can be tricky as they're prone to degradation.
View Article and Find Full Text PDFFermi Level Shifts of Organic Semiconductor Films in Ambient Air.
ACS Appl Mater Interfaces
January 2025
Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping SE-60174, Sweden.
Here, the Fermi level () shifts of several donor and acceptor materials in different atmospheres are systematically studied by following the work function (WF) changes with Kelvin probe measurements, ultraviolet photoelectron spectroscopy, and near-ambient pressure X-ray photoelectron spectroscopy. Reversible shifts are found with the trend of higher WFs measured in ambient air and lower WFs measured in high vacuum compared to the WFs measured in ultrahigh vacuum. The shifts are energy level and morphology-dependent, and two mechanisms are proposed: (1) competition between p-doping induced by O and HO/O complexes and n-doping induced by HO; (2) polar HO molecules preferentially modifying the ionization energy of one of the frontier molecular orbitals over the other.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!