Pt Nanoparticles on Vertically Aligned Large-Area MoS₂Flakes for Selective H₂Sensing at Room Temperature

Abstract

The increasing demand of hydrogen (H2) as an alternative clean fuel emboldened the parallel development of extremely sensitive room-temperature H2 sensors for safety purposes. Molybdenum disulfide (MoS2) is an intriguing material, exhibiting a high chemical sensing ability. However, usage of MoS2 in H2 sensors has been limited and usually suffers from low sensitivity and selectivity, especially at room temperature. In this work, we report a highly sensitive and selective H2 sensor based on Pt nanoparticle-functionalized vertically aligned large-area MoS2 flakes. The fabricated Pt@MoS2 sensor exhibits a high sensitivity value of 23%, excellent reproducibility, fast response, and complete recovery at room temperature. The superior response of the sensor is attributed to the spillover effect and adsorption sites distributed on the Pt surface and the MoS2–Pt interface. The influence of operating temperature on the sensing performance is also investigated. Density functional theory calculations validate our experimental results and demonstrate higher adsorption of H2 for Pt@MoS2 leading to improved and selective H2 response. This study offers Pt nanoparticle-sensitized MoS2 as a potential candidate for the development of low-power and room-temperature H2 sensors for near future hydrogen vehicles and related technologies.

Correlation between charge density wave phase transition and hydrogen adsorption in 1T-TaS2 thin film devices

“…Typically, H 2 sensors using semiconducting 2D-TMDs, such as MoS 2 and WS 2 , are insensitive to H 2 . Therefore, to enhance their sensitivity, semiconducting 2D-TMDs are decorated with noble metals such as Pd, Pt, and Au [4][5][6][7][8][9][10][11][12][13]. The H 2 molecules adsorbed on the noble metals form metal hydrides and undergo charge transfer between the metal hydride and the 2D-TMD.…”

“…The response time is slower than those of other TMD and noble metal composites. For example, the response time of H 2 sensor using a MoS 2 -Pt composite was approximatley 40 s [9,12]. The response times of several minutes or less were reported for H 2 sensors using Pt composites with metal oxides such as SnO 2 and WO 3 , which are commonly used as H 2 sensor materials [46,47].…”

“…Therefore, several H 2 sensors using semiconducting 2D-TMDs are insensitive to H 2 [4,5]. To improve H 2 sensitivity, semiconducting 2D-TMDs have been decorated with noble metals such as Pd, Pt, and Au [4][5][6][7][8][9][10][11][12][13]. H 2 adsorbed on a noble metal forms a metal hydride, causing charge transfer between the metal hydride and the 2D-TMD, which can be exploited for H 2 sensing.…”

2D/2D Nanostructured System Based on WO3/WS2 for Acetone Sensor and Breath Analyzer

“…Due to their potential in a variety of technologies, including sensors, electronics, optoelectronics, and other fields, two-dimensional layered materials, such as g-C 3 N 4 and MoS 2 , have drawn significant interdisciplinary attention. 5,22,23 2D layered materials provide a new platform to efficiently build mixed-dimensional heterostructures (MHs) using zero-dimensional (0D) and one-dimensional (1D) nanostructures. 24,25 The electrical conductivity, surface activity, and sensing response of MHs can be effectively tailored, according to prior reports, by selecting the right candidate materials.…”

“…Heterojunctions may be significant in this regard. Due to their potential in a variety of technologies, including sensors, electronics, optoelectronics, and other fields, two-dimensional layered materials, such as g-C 3 N 4 and MoS 2 , have drawn significant interdisciplinary attention. ,, 2D layered materials provide a new platform to efficiently build mixed-dimensional heterostructures (MHs) using zero-dimensional (0D) and one-dimensional (1D) nanostructures. , The electrical conductivity, surface activity, and sensing response of MHs can be effectively tailored, according to prior reports, by selecting the right candidate materials. , The first method involves doping metal oxides with nanoparticles of noble metals or creating composites out of other metal oxides. , Although this approach improves the sensor performance, it fails to make sensors fully selective . However, sensors can also be trained to recognize patterns to identify unknown VOCs.…”