A large detectable-range, high-response and fast-response resistivity hydrogen sensor based on Pt/Pd core–shell hybrid with graphene

Graphene–Noble Metal Nano-Composites and Applications for Hydrogen Sensors

“…PdHx increases the resistance of sensor structures. As a result, conduction pathways are directed from graphene to Pd film and thus decrease the gas response Phan et al [30] fabricated a hydrogen sensor, based on a graphene and Pt/Pd bimetallic catalyst core shell hybrid. A uniform colloidal solution of Pd nanocubes was used as the core and then Pt was coated on Pd cubes.…”

Effects of Pt shell thickness on self-assembly monolayer Pd@Pt core-shell nanocrystals based hydrogen sensing

“…Gas sensing characterizations were carried out in a similar way as done in our previous works [3,23,28,29]. In brief, the sensor was mounted inside a chamber and recorded the resistance values of the sensor using a semiconductor processing system (Keithley SCS-4200) under the operating temperature from 25 C (room temperature) to 250 C. Gas atmosphere inside the chamber was controlled using a computerized mass flow controller (ATOVAC, GMC 1200) using synthetic air (Deokyang Co. Ltd) and different concentrations of H 2 at a constant flow rate of 50 standard cubic centimeters per minute (sccm).…”

“…Bimetallic catalyst nanostructures are promising as sustainable energy technologies and have the potential to achieve high activity, selectivity, and stability in various applications such as fuel cells [1,2], chemical/gas sensors [3,4], catalysis [5e8], hydrogen generation [9], and hydrogen storage [10,11]. The enhanced functionality strongly depends on local chemical composition, size, and shape, in which the local coordination, surface site distribution, surface constraint, and structural flexibility have a significant influence on the intrinsic properties of the bimetallic nanostructures [12].…”

“…On the other hand, Pd@Pt core-shells can be attractive bimetallic systems for the H 2 adsorptionedesorption process due to the imperfections at the Pd@Pt boundary [3]. For example, the structural anisotropy of the highly crystalline Pd@Pt core-shell modifies the surface contraction due to the intrinsic lattice mismatch between Pt and Pd, resulting in the alteration of the surface energy, hence facilitating the sensing speed of the sensor.…”

Laser‐Induced Colloidal Writing of Organometallic Precursor–Based Repeatable and Fast Pd–Ni Hydrogen Sensor

“…Specifically, organometallic precursors yield NPs under mild conditions of temperature and pressure, giving rise to an accurate control on the kinetics of the NPs formation and growth . Colloidal methods allow for the formation of composite materials which can be sprayed to form a thin film, like Pd nanocube–graphene, core–shell Pt/Pd–graphene hybrid sensors, or Pd nanocube‐MWCNTs …”