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Recently, graphene has attracted much attention due to its unique electrical and thermal properties along with its high surface area, and hence presents an ideal sensing material. We report a novel configuration of a graphene based flame sensor by exploiting the response of few layer graphene to a flame along two different directions, where flame detection results from a difference in heat transfer mechanisms. A complete sensor module was developed with a signal conditioning circuit that compensates for any drift in the baseline of the sensor, along with a flame detection algorithm implemented in a microcontroller to detect the flame. A pre-defined threshold for either of the sensors is tunable, which can be varied based on the nature of the flame, hence presenting a system that can be used for detection of any kind of flame. This finding also presents a scalable method that opens avenues to modify complicated sensing schemes.
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http://dx.doi.org/10.1088/0957-4484/26/19/195502 | DOI Listing |
Int J Biol Macromol
March 2025
Institute of Power Engineering, Department of Electrical Electronics, College of Engineering, Universiti Tenaga Nasional, Jalan Ikram-UNITEN, 43000 Kajang, Malaysia. Electronic address:
The pervasive occurrence of various organic contaminants, primarily dye molecules, in water bodies was caused by multiple dye industrial wastes, which recently sparked great scientific concern and public awareness due to their potential to spread these contaminants' resistant genes and pose a risk to humans. Cross-linking graphene in chitosan resulted in nanocomposites in varied morphology, increased surface area, and considerably improved photocatalytic removal of bromothymol blue and bromophenol blue. The degradation capacity of photocatalysts at various concentrations (25 and 50 mg) was 96.
View Article and Find Full Text PDFTalanta
March 2025
Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK. Electronic address:
The interfacial capacitance of graphene foam electrodes (Gii-Sens) in contact to aqueous media (determined by electrochemical impedance spectroscopy) is strongly affected by adsorption of 1-pyrenemethylamine (PMA). An order of magnitude increase in capacitance upon adsorption is ascribed predominantly to the quantum capacitance contribution (i.e.
View Article and Find Full Text PDFInt J Biol Macromol
March 2025
Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, People's Republic of China. Electronic address:
Due to the shortage of global petrochemical resources, preparing biodegradable polyurethane foam (PUF) with excellent strength and resistance against fire is an important way for sustainable development. A reactive all bio-based flame retardant CPE was prepared using chitosan (CS), phytic acid (PA), and epoxidized soybean oil (ESO) as raw materials. Meanwhile, the bio-based PUF matrix, named ERP, was prepared with ESO, ricinoleic acid (RA) and 4,4-diphenylmethane diisocyanate (PMDI).
View Article and Find Full Text PDFNat Mater
March 2025
Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland.
Antiferromagnetic Heisenberg chains exhibit two distinct types of excitation spectrum: gapped for integer-spin chains and gapless for half-integer-spin chains. However, in finite-length half-integer-spin chains, quantization induces a gap, requiring precise control over sufficiently long chains to study its evolution. Here we create length-controlled spin-1/2 Heisenberg chains by covalently linking Olympicenes-Olympic-ring-shaped magnetic nanographenes.
View Article and Find Full Text PDFSci Rep
March 2025
Department of Physics, Xiamen University, Xiamen, 361005, China.
Precisely regulating active sites is vital for promoting the oxygen reduction reaction (ORR) activity. Here we reported highly active Ni-Pd co-doped N-coordinated graphene towards ORR achieved by edge termination and O doping. Our first-principles calculations demonstrated that edge termination effectively boost the ORR activity, and armchair-edge termination was energetically more favorable than zigzag-edge termination.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!