In this study,we investigate an innovative hybrid structure of silicon nanowires(SiNWs)coated with polyaniline(PANI):metal oxide(MO_(x))nanoparticles,i.e.,WO_(3)and TiO_(2),for respiratory sensing.To date,few attempts...In this study,we investigate an innovative hybrid structure of silicon nanowires(SiNWs)coated with polyaniline(PANI):metal oxide(MO_(x))nanoparticles,i.e.,WO_(3)and TiO_(2),for respiratory sensing.To date,few attempts have been made to utilize such hybrid structures for that application.The Si NWs were fabricated using metal-assisted chemical etching(MACE),whereas PANI:MO_(x)was deposited using chemical oxidative polymerization.The structures were characterized using Raman spectroscopy,X-ray diffraction,and scanning electron microscopy.The sensing characteristics revealed that the hybrid sensor exhibited a considerably better response than pure Si NWs:MO_(x)and Si NWs:PANI.Such an enhancement in sensitivity is attributed to the formation of a p-n heterojunction between PANI and MO_(x),the wider conduction channel provided by PANI,increased porosity in SiNWs/PANI:WO_(3)hybrid structures,which creates active sites,increased oxygen vacancies,and the large surface area compared to that available in pure MO_(x)nanoparticles.Furthermore,less baseline drift and increased sensor stability were established for the SiNWs structure coated with PANI:WO_(3),as compared to PANI:TiO_(2).展开更多
基金supported by the Icelandic research fund,Grant No.239987-051by Landsvirkjun-Energy Research Fund,Grant No.NYR-29-2024。
文摘In this study,we investigate an innovative hybrid structure of silicon nanowires(SiNWs)coated with polyaniline(PANI):metal oxide(MO_(x))nanoparticles,i.e.,WO_(3)and TiO_(2),for respiratory sensing.To date,few attempts have been made to utilize such hybrid structures for that application.The Si NWs were fabricated using metal-assisted chemical etching(MACE),whereas PANI:MO_(x)was deposited using chemical oxidative polymerization.The structures were characterized using Raman spectroscopy,X-ray diffraction,and scanning electron microscopy.The sensing characteristics revealed that the hybrid sensor exhibited a considerably better response than pure Si NWs:MO_(x)and Si NWs:PANI.Such an enhancement in sensitivity is attributed to the formation of a p-n heterojunction between PANI and MO_(x),the wider conduction channel provided by PANI,increased porosity in SiNWs/PANI:WO_(3)hybrid structures,which creates active sites,increased oxygen vacancies,and the large surface area compared to that available in pure MO_(x)nanoparticles.Furthermore,less baseline drift and increased sensor stability were established for the SiNWs structure coated with PANI:WO_(3),as compared to PANI:TiO_(2).
