Badie, Clemence Lee, Jae-Hyoung Mirzaei, Ali Kim, Hyoun Woo Sayegh, Syreina Bechelany, Mikhael Santinacci, Lionel Kim, Sang Sub 2024-01-19T09:31:26Z 2024-01-19T09:31:26Z 2023-06-15 2023-06 2050-7488 https://pubs.kist.re.kr/handle/201004/113679 In this study, we designed a new structure based on Pd-decorated TiN-coated SnO2 nanowires (NWs) for the selective detection of H-2 gas. Initially, SnO2 NWs were prepared by a simple vapor-liquid-solid growth method. Then, atomic layer deposition (ALD) was used to grow a continuous TiN layer and, subsequently, Pd nanoparticles on the NW networks. The TiN thickness was precisely set to 0.5, 1, 2, and 5 nm, while the Pd loading was adjusted by varying the number of ALD cycles (25 to 200 cycles). Various characterization techniques revealed the amorphous nature of TiN, a homogeneous dispersion of Pd NPs and the uniform morphology and single crystallinity of the SnO2 NWs. H-2 gas sensing studies revealed that the sensor with a TiN thickness of 1 nm exhibited the highest response. Pd decoration further improved the response to H-2 gas. Hence, the Pd-decorated gas sensor with a 1 nm-thick TiN layer showed the highest H-2 sensing performance at 250 degrees C among all gas sensors. Due to the unique chemical reaction between Pd and hydrogen, the fabricated sensor shows excellent performance in detecting hydrogen gas. The underlying sensing mechanism is discussed in detail. The optimized sensor has a sensitivity of 8.18 for hydrogen gas, which is four times higher than that of other gas species, showing that it is suitable for detecting hydrogen gas. We believe that this new design is a highly valuable gas sensor for the real application of H-2 monitoring with high selectivity. English Royal Society of Chemistry Enhanced sensitivity towards hydrogen by a TiN interlayer in Pd-decorated SnO2 nanowires Article 10.1039/d3ta00020f 1 Journal of Materials Chemistry A, v.11, no.23, pp.12202 - 12213 Journal of Materials Chemistry A 11 23 12202 12213 Y scie scopus 000997436400001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article; Early Access ATOMIC LAYER DEPOSITION METAL-OXIDE NANOSTRUCTURES GAS SENSORS TITANIUM NITRIDE SENSING PROPERTIES FILMS H-2 NANOPARTICLES ENERGY SEMICONDUCTOR