Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 38, Pages 15931-15937Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta02581d
Keywords
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Funding
- Natural Science Foundation of China [11374372]
- Taishan Scholar Foundation [ts20130929]
- Fundamental Research Funds for the Central Universities [13CX05004A, 13CX05009A, 14CX02018A, 14CX02025A]
- Qingdao Science & Technology Program [12-1-4-7-(1)-jch]
- National Super Computing Center in Jinan
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Graphene nanoribbons (GNRs) have been of great interest in a wide range of device applications for their novel physical, electronic and spin transport properties. Here we study the hydrogen (H-2) sensing properties of GNRs decorated with palladium (Pd) nanoparticles by a one-step chemical modification and reduction process. A novel Pd-GNR film/SiO2/Si structure was fabricated by transferring a Pd-GNR film onto a heavily doped Si substrate with a native oxide layer. It is demonstrated that the Pd-GNR film/SiO2/Si structure exhibits highly enhanced responses to H-2 than the pristine Pd-GNR film at parts-per-million (ppm) concentration levels at room temperature. For example, the Pd-GNR film/SiO2/p-Si structure shows an excellent response (Delta R/R-air) of similar to 94% to 100 ppm H-2 in air. The sensing mechanism was proposed to explain these H2 sensing characteristics based on p-n junction theory. Our findings demonstrate the incorporation of nanoparticles in GNR-based gas sensors through chemical functionalization and present a novel strategy for the application of GNRs in high performance gas sensors.
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