Single-atom-thin platinum makes a great chemical sensor

Researchers at Sweden’s Chalmers University of Technology, together with colleagues from other universities, have explored the possibility of producing one-atom thin platinum for use as chemical sensors. The results were recently published in the scientific journal Advanced Material Interfaces.

A schematic of platinum atoms deposited on the surface of a carbon “buffer-layer”, a 2-D insulating material such as graphene grown epitaxially on silicon carbide, enabling two-dimensional growth of platinum.

“In short, we managed to make only one-atom thick like a new material to make a metal layer. We found that this atom-thin metal is super sensitive to its chemical environment. When interacting with gaseous Its electrical resistance changes drastically., ”Explains Kyung Ho Kim, in the Department of Postmock Microtechnology at the Quantum Instruments Physics Laboratory and Nanoscience at Chalmers, and the lead author of the article.

The essence of research is the development of 2-D materials beyond graphene.

Samuel Lara Avila, associate professor of quantum devices, says, “Atomically thin platinum can be useful for ultra-sensitive and rapid electrical detection of chemicals. We have studied the case of platinum in great detail, but others like palladium Metals also give similar results. ” Physics Laboratory and one of the authors of the article.

The researchers used the sensitive chemical-to-electric transit capability of atomically thin platinum to detect toxic gases at the per-billion level. They performed this with the detection of benzene, a compound that is carcinogenic even at very low concentrations, and for which no low-cost detection mechanism exists.

“This new approach, using atomically thin metals, is very promising for future air-quality monitoring applications,” says Jens Erikson, head of the Applied Sensor Science Unit at Linköping University and co-author of the paper.

Solid gas can be complicated by effects at the interface by incorporating nanostructured materials as active sensory elements to promote the sensitivity of the state gas sensor. The difference on nanoparticles, grains, or contacts may be due to nonlinear current-voltage feedback, high electrical resistance, and ultimately, electric noise that limits sensor read the.

This work reports the possibility of preparing the carbon zero layer (also called the buffer layer) on silicon carbide by electrically continuous platinum layers at an atomic thickness, by physical vapor deposition. With a 3–4 Pt thin Pt layer, the electrical conductivity of the metal is strongly modified, when interacted with chemical analysis, Pt. Due to transfer from / to. The strong interaction with the chemical species, along with the scalability of the material, enables the manufacture of chemisor devices for electrical reeds, with subdivisions of the chemical species (billion (ppp) per subdivision. Atoms at the carbon zero layer on SiC The 2-D system fabricated by the thinner Pt opens a pathway for flexible and high-sensitivity chemical detection and may be the route to design new heterogeneous catalysts with improved activity and selectivity.

Platinum-graphene fuel cell catalysts show better stability over bulk platinum

more information:
Kyung Ho Kim et al. Chemical sensing with platinum temporarily diluted by 2D insulator, Advanced Content Interface (2020). DOI: 10.1002 / admi.201902104

Is provided by Chalmers University of Technology

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