Gas-Sensing Properties of a Carbyne-Enriched Nanocoating Deposited onto Surface Acoustic Wave Composite Substrates with Various Electrode Topologies

Abstract

The application of carbyne-enriched nanomaterials opens unique possibilities for enhancing the functional properties of several nanomaterials and unlocking their full potential for practical applications in high-end devices. We studied the ethanol-vapor-sensing performance of a carbyne-enriched nanocoating deposited onto surface acoustic wave (SAW) composite substrates with various electrode topologies. The carbyne-enriched nanocoating was grown using the ion-assisted pulse-plasma deposition technique. Such carbon nanostructured metamaterials were named 2D-ordered linear-chain carbon, where they represented a two-dimensionally packed hexagonal array of carbon chains held by the van der Waals forces, with the interchain spacing approximately being between 4.8 and 5.03 Å. The main characteristics of the sensing device, such as dynamic range, linearity, sensitivity, and response and recovery times, were measured as a function of the ethanol concentration. To the authors’ knowledge, this was the first time demonstration of the detection ability of carbyne-enriched material to ethanol vapors. The results may pave the path for optimization of these sensor architectures for the precise detection of volatile organic compounds, with applications in the fields of medicine, healthcare, and air composition monitoring.

Routines for the synthesis of carbyne with more than 6000 atoms

“…While the chain length is fixed, the optimization process focuses only on the radial direction of the CNT. An isolated long LCC is always unstable in a room-temperature environment due to strong atomic fluctuations [10][11][12][13][14][15]. The kink angle is a measure of the atomic fluctuations in the LCC.…”

“…If all covalent bonds in the LCC are stable, the LCC with a length of 15000 atoms should have weaker atomic fluctuations than the LCC with a length of 6000 atoms. However, extensive studies of LCC show that the elongation of LCC always leads to chain termination or self-dissociation [10][11][12][13][14][15]25,27]. So far, the formation of all stable covalent bonds in an extremely long LCC has not been observed experimentally.…”

“…Carbon exists in many different forms, including 3D structures with sp 3 hybridization, such as diamond, or 2D structures with sp 2 bonds like graphite and graphene. While the latter already exhibits edge modes, a third type of one-dimensional sp hybridization yields the allotrope carbyne [9][10][11][12][13][14][15]. As a truly one-dimensional monoatomic semiconductor, it exhibits exceptionally mechanical strength with a band gap that can be widely tuned by strain [16], and basically consists of an edge everywhere.…”

Unlocking the Carbyne-Enriched Nanocoating Sensitivity to Volatile Organic Vapors with Plasma-Driven Deposition onto Bulk Micromachined Silicon Membranes

“…An additional reference ethanol sensor (MQ-3 (ME075)) with the necessary resolution was mounted close to the device under study. A schematic view of the testing setup can be found elsewhere [17]. The device response was recorded by Impedance analyzer Hioki IM3590 (Hioki E.E., Nagano, Japan).…”

Унимодальное и бимодальное распределение серебряных наночастиц в a-C : Ag-структурах с различным соотношением sp-=SUP=-2-=/SUP=-/sp-=SUP=-3-=/SUP=--углерода, изготовленных методом низкоэнергетического ионно-ассистированного импульсно-плазменного осаждения

“…В настоящей работе исследуются покрытия, изготовленные методом импульсно-плазменного осаждения [17]. Наноструктурированные покрытия на основе углерода, изготавливаемые при помощи данного метода, активно изучаются для применения в сенсорах [18,19], в качестве упрочняющих покрытий [20], а также функциональных материалов установок хранения и преобразования энергии [21]. В число преимуществ данного метода входит возможность осуществления послойного осаждение наноструктур и синтеза композитов на основе метастабильных фаз углерода, а также отсутствие существенного нагрева подложек, позволяющее осуществлять напыление на различные типы подложек [22][23][24][25].…”