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Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors.
ACS Sens 2018; 3(10):2152-2158AS

Abstract

In this work, we prepared a well-aligned palladium oxide nanowire (PdO NW) array using the lithographically patterned Pd nanowire electrodeposition (LPNE) method followed by subsequent calcination at 500 °C. Sensitization with platinum (Pt) nanoparticles (NPs), which were functionalized on PdO NWs through a simple reduction process, significantly enhanced the detection capability of the Pt-loaded PdO NWs (Pt-PdO NWs) sensors toward hydrogen gas (H2) at room temperature. The well-distributed Pt NPs, which are known chemical sensitizers, activated the dissociation of H2 and oxygen molecules through the spillover effect with subsequent diffusion of these products to the PdO surface, thereby transforming the entire surface of the PdO NWs into reaction sites for H2. As a result, at a high concentration of H2 (0.2%), the Pt-PdO NWs showed an enhanced sensitivity of 62% (defined as Δ R/ Rair × 100%) compared to that (6.1%) of pristine PdO NWs. The Pt-PdO NWs exhibited a response time of 166 s, which was 2.68-fold faster than that of pristine PdO NWs (445 s). In addition, the Pt-PdO NWs responded to a very low concentration of H2 (10 ppm) with a sensitivity of 14%, unlike the pristine PdO NWs, which did not exhibit any response at that concentration. These outstanding results are mainly attributed to a homogeneous decoration of Pt NPs on the surface of well-aligned PdO NWs. In this work, we demonstrated the potential suitability of Pt-PdO NWs as a highly sensitive H2 sensing layer at room temperature.

Authors+Show Affiliations

Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea.No affiliation info availableNo affiliation info availableDepartment of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea.No affiliation info availableDepartment of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

30264562

Citation

Cho, Hee-Jin, et al. "Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors." ACS Sensors, vol. 3, no. 10, 2018, pp. 2152-2158.
Cho HJ, Chen VT, Qiao S, et al. Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors. ACS Sens. 2018;3(10):2152-2158.
Cho, H. J., Chen, V. T., Qiao, S., Koo, W. T., Penner, R. M., & Kim, I. D. (2018). Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors. ACS Sensors, 3(10), pp. 2152-2158. doi:10.1021/acssensors.8b00714.
Cho HJ, et al. Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors. ACS Sens. 2018 10 26;3(10):2152-2158. PubMed PMID: 30264562.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors. AU - Cho,Hee-Jin, AU - Chen,Vivian T, AU - Qiao,Shaopeng, AU - Koo,Won-Tae, AU - Penner,Reginald M, AU - Kim,Il-Doo, Y1 - 2018/10/15/ PY - 2018/9/29/pubmed PY - 2018/9/29/medline PY - 2018/9/29/entrez KW - LPNE KW - PdO nanowires KW - Pt catalyst KW - electrodeposition KW - hydrogen chemical sensors SP - 2152 EP - 2158 JF - ACS sensors JO - ACS Sens VL - 3 IS - 10 N2 - In this work, we prepared a well-aligned palladium oxide nanowire (PdO NW) array using the lithographically patterned Pd nanowire electrodeposition (LPNE) method followed by subsequent calcination at 500 °C. Sensitization with platinum (Pt) nanoparticles (NPs), which were functionalized on PdO NWs through a simple reduction process, significantly enhanced the detection capability of the Pt-loaded PdO NWs (Pt-PdO NWs) sensors toward hydrogen gas (H2) at room temperature. The well-distributed Pt NPs, which are known chemical sensitizers, activated the dissociation of H2 and oxygen molecules through the spillover effect with subsequent diffusion of these products to the PdO surface, thereby transforming the entire surface of the PdO NWs into reaction sites for H2. As a result, at a high concentration of H2 (0.2%), the Pt-PdO NWs showed an enhanced sensitivity of 62% (defined as Δ R/ Rair × 100%) compared to that (6.1%) of pristine PdO NWs. The Pt-PdO NWs exhibited a response time of 166 s, which was 2.68-fold faster than that of pristine PdO NWs (445 s). In addition, the Pt-PdO NWs responded to a very low concentration of H2 (10 ppm) with a sensitivity of 14%, unlike the pristine PdO NWs, which did not exhibit any response at that concentration. These outstanding results are mainly attributed to a homogeneous decoration of Pt NPs on the surface of well-aligned PdO NWs. In this work, we demonstrated the potential suitability of Pt-PdO NWs as a highly sensitive H2 sensing layer at room temperature. SN - 2379-3694 UR - https://www.unboundmedicine.com/medline/citation/30264562/Pt_Functionalized_PdO_Nanowires_for_Room_Temperature_Hydrogen_Gas_Sensors_ DB - PRIME DP - Unbound Medicine ER -