AI Article Synopsis
- A new method for creating high-performing hydrogen sensors was developed, utilizing a chromium oxidation process to create a nanogap in suspended palladium and gold films.
- The sensor operates on the principle that palladium expands when it comes into contact with hydrogen, allowing it to detect gas by closing the nanogap and measuring current.
- The enhanced sensor demonstrated excellent sensitivity and quick response time, while being cost-effective and suitable for large-scale manufacturing.
Article Abstract
Developing high response hydrogen sensors manufacturable in a large scale is desirable in hydrogen industry. In this study, a chromium oxidation-based nanogap formation process was developed to fabricate a hydrogen switch with suspended palladium and gold films having a tens of nanometer-sized gap. The nanogap was formed by using oxidized chromium as a self-alignment shadow mask. The hydrogen switch operates by the principle of volume expansion of palladium upon exposure to the hydrogen gas and the current reading by closing of a nanogap formed between suspended palladium and gold films. Further improvement of the sensor performance was achieved by optimizing the design parameters such as suspended film lengths and thicknesses. The fabricated palladium nanogap hydrogen sensor showed an ultrahigh sensitivity of Δ/ > 10 with a fast response time (22 s) to 4% hydrogen. The complementary metal-oxide-semiconductor-compatible fabrication of the hydrogen switch is easily scalable with low manufacturing cost.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.langmuir.1c02643 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Searching for nitroxyl modulators in Arabidopsis thaliana - a new paradigm of redox signaling in plant.
J Exp Bot
January 2025
Department of Plant Ecophysiology, Faculty of Biology, Adam Mickiewicz University; Uniwersytetu Poznańskiego 6, 61-614 Poznań, Poland.
Through extensive research, nitroxyl (HNO) has emerged as a newly recognized redox signal in plant developmental and stress responses. The interplay between nitric oxide (●NO) and HNO entails a complex network of signaling molecules and regulatory elements sensitive to the environment's specific redox conditions. However, functional implications for HNO in cell signaling require more detailed studies, starting with identifying HNO-level switches.
View Article and Find Full Text PDFSelf-Sustained Biophotocatalytic Nano-Organelle Reactors with Programmable DNA Switches for Combating Tumor Metastasis.
Adv Mater
January 2025
Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003, P. R. China.
Metastasis, the leading cause of mortality in cancer patients, presents challenges for conventional photodynamic therapy (PDT) due to its reliance on localized light and oxygen application to tumors. To overcome these limitations, a self-sustained organelle-mimicking nanoreactor is developed here with programmable DNA switches that enables bio-chem-photocatalytic cascade-driven starvation-photodynamic synergistic therapy against tumor metastasis. Emulating the compartmentalization and positional assembly strategies found in living cells, this nano-organelle reactor allows quantitative co-compartmentalization of multiple functional modules for the designed self-illuminating chemiexcited PDT system.
View Article and Find Full Text PDFDimer Is Not Double: The Unexpected Behavior of Two-Floor Peptide Nanosponge.
Molecules
December 2024
Department of Chemical Science and Technologies, University of Rome "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy.
Using the framework of an investigation of the stimuli-responsive behavior of peptide assembly on a solid surface, this study on the behavior of a chemisorbed peptide on a gold surface was performed. The studied peptide is a dimeric form of the antimicrobial peptide Trichogin GAIV, which was also modified by substituting the glycine with lysine residues, while the N-terminus octanoyl group was replaced by a lipoic one that was able to bind to the gold surface. In this way, a chemically linked peptide assembly that is pH-responsive was obtained because of the protonation/deprotonation of the sidechains of the Lys residues.
View Article and Find Full Text PDFAsymmetric Synthesis of Azahelicenes via CPA-Catalyzed Kinetic Resolution.
Org Lett
January 2025
Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China.
The azahelicenes are structurally fascinating and practically useful chiral scaffolds, but their synthesis, especially in a catalytically asymmetric manner, is rather challenging. Herein, we report a CPA-catalyzed transfer hydrogenation process, which enables a rapid kinetic resolution of aza[6]helicenes. The established strategy provides facile access to enantioenriched aza[6]helicenes and tetrahydro[6]helicenes from easily available starting materials.
View Article and Find Full Text PDFCysteine modifications as molecular switch governing salicylic acid biosynthesis in systemic acquired resistance.
J Integr Plant Biol
January 2025
Plant Stress Physiology and Proteomics Laboratory, College of General Education, Kookmin University, Seoul, 02707, South Korea.
This commentary discusses the recent identification of hydrogen peroxide as systemic acquired resistance-inducing signal and its dose-dependent effect on salicylic acid biosynthesis in the systemic tissues in response to a pathogen attack.
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!