Diamondoid Nanostructures as sp³‐Carbon‐Based Gas Sensors

Abstract

Diamondoids, sp3‐hybridized nanometer‐sized diamond‐like hydrocarbons (nanodiamonds), difunctionalized with hydroxy and primary phosphine oxide groups, enable the assembly of the first sp3‐C‐based chemical sensors by vapor deposition. Both pristine nanodiamonds and palladium nanolayered composites can be used to detect toxic NO2 and NH3 gases. This carbon‐based gas sensor technology allows reversible NO2 detection down to 50 ppb and NH3 detection at 25–100 ppm concentration with fast response and recovery processes at 100 °C. Reversible gas adsorption and detection is compatible with 50 % humidity conditions. Semiconducting p‐type sensing properties are achieved from devices based on primary phosphine–diamantanol, in which high specific area (ca. 140 m2 g−1) and channel nanoporosity derive from H‐bonding.

Advanced Composite for sp3‐Carbon‐Based Gas Sensing Application from Gold Organometallic Single Nanolayering on Diamondoids

“…Because of the thin layer and hybrid metal-organic nature the overall resistivity will be stronger providing a more sensitive material. That is what was observed in our recent works, [8,9] and confirmed herein. We recently achieved hybrid materials from molecularly-defined functionalized diamondoids with palladium, by chemical vapor deposition of a palladium organometallic complex over the selfassembly of diamondoids scaffold.…”

Wafer-scale few-layer graphene growth on Cu/Ni films for gas sensing applications

“…Here, it should be stressed that unlike previous reports (Tables 2 and 3), the gas-sensing studies were carried out using low gas flows (100 sccm) and long reaction times (30 min), close to the practical conditions of environmental monitoring sensors. The response/recovery is slow, which could be further improved by decreasing the dead volume in the airtight chamber or device miniaturization [64]. Therefore, considering the high sensitivity obtained for low concentration of pollutants (Table 2), the as-produced FLG shows a high potential to be further optimized towards a commercial NO 2 gas-sensor for continuous environmental monitoring [13].…”

3D Ruthenium Nanoparticle Covalent Assemblies from Polymantane Ligands for Confined Catalysis

“…Commercially available adamantane and diamantane have mechanically rigid and thermodynamically extremely stable structures, 19,20 which are easily amenable to synthetic modifications, [21][22][23] and have been used with success to assemble various innovative functional materials. [24][25][26] Thus, we employed adamantane, bis-adamantane and diamantane as platform for synthesizing dicarboxylic and diamine ligands, which are used for the first time to produce a set of Ru NP networks with well-defined characteristics (NP size, interparticle distance, electronic environment) of interests for catalysis. These materials were investigated for the selective hydrogenation of phenylacetylene into styrene.…”