Mesoporous WO3-TiO2 heterojunction for a hydrogen gas sensor

Li, Hui; Wu, Chung-Yu; Liu, Yicheng; Yuan, Shuo‐Huang; Chiang, Zong-Xian; Zhang, Sam; Wu, Ren‐Jang

doi:10.1016/j.snb.2021.130035

Cited by 72 publications

(27 citation statements)

References 43 publications

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“…12 As for a Co 3 O 4 −TiO 2 nanosheet sensor, adsorption of O 2 molecules occurs on the surfaces of Co 3 O 4 and TiO 2 to form O 2(ads) when the Co 3 O 4 −TiO 2 nanosheets contact with oxygen in air, as described by eq 1. 33 O 2(ads) on the surfaces can combine with the electrons in Co 3 O 4 and TiO 2 , producing chemisorbed O 2− species, as described by eqs 2 and 3, 12,34 respectively. Simultaneously, the above processes will create a hole accumulation layer and an electron depletion layer on the surfaces of Co 3 O 4 and TiO 2 , respectively.…”

Section: Sensing Mechanismmentioning

confidence: 99%

Nanoporous Co₃O₄–TiO₂ Heterojunction Nanosheets for Ethanol Sensing

Zhang

Liang

et al. 2022

ACS Appl. Nano Mater.

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Construction of suitable heterojunction oxide nanocomposites with affluent porosities and distinctive microstructures is a primary approach for acquiring high-performance sensing materials for specific gases. In this work, certain Co3O4–TiO2 porous heterojunction nanosheets derived from bimetal–organic frameworks (BMOFs) were constructed by calcining MIL-125 and ZIF-67 precursors with the goal of sensing ethanol. Sensing results showed that BMOF-derived Co3O4–TiO2 porous nanosheets exhibited much better ethanol-sensing performances than metal–organic framework (MOF)-derived TiO2 nanotablets. The molar ratio of Co3O4 to TiO2 was modulated to optimize the sensing performances of the Co3O4–TiO2 nanosheets. Under the conditions of 250 °C and 50 ppm ethanol, the heterojunction nanosheets with an optimal molar ratio of 12 mol % displayed the highest response value of 41.72, which was 20.76 times higher than the response of pure TiO2 nanotablets (2.01). Moreover, the selectivity coefficient (85.29%) of 12 mol % Co3O4–TiO2 nanosheets was about 3.06 times as large as that of pure TiO2 nanotablets (27.91%). The enhanced sensing performances toward ethanol were mainly due to the formed p–n heterojunctions and the porous nanosheet nanostructures with a high specific surface area.

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Section: Sensing Mechanismmentioning

confidence: 99%

Nanoporous Co₃O₄–TiO₂ Heterojunction Nanosheets for Ethanol Sensing

Zhang

Liang

et al. 2022

ACS Appl. Nano Mater.

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“…Penelitian serupa pernah dilakukan oleh Amelia and Elvaswer (2018) menggunakan bahan SnO2 didoping Na2CO3 dengan metode reaksi dalam keadaan padat. Sensor SnO2 yang didoping 8% mol Na2CO3 menunjukkan sensitivitas tertinggi yaitu 4,83 dan selektivitas 2,92 pada tegangan 9 volt dengan waktu respon 63 s. Li et al, (2021) juga meneliti sensor hidrogen menggunakan komposit WO3-TiO2 dengan metode sol-gel. Sensor WO3-TiO2 dengan komposisi WO3 sebanyak 4% massa (1,4% mol) menunjukkan sensitivitas tertinggi yaitu 5,26 terhadap 10.000 ppm hidrogen pada suhu ruang.…”

Section: Pendahuluanunclassified

Karakterisasi Arus dan Tegangan Detektor Gas Hidrogen dari Bahan Semikonduktor Heterokontak TiO2/ZnO(Mg)

Bahar¹,

Elvaswer

2023

JFU

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Telah dilakukan pembuatan dan karakterisasi detektor gas hidrogen berupa pelet heterokontak. Pelet terdiri dari lapisan pertama yaitu TiO2 dan lapisan kedua terdiri dari ZnO yang didoping dengan 0%, 2%, 4%, 6%, 8%, dan 10% mol Mg. Pembuatan detektor diawali dengan pencampuran bahan, penggerusan bahan selama 4 jam, kalsinasi pada suhu 500 °C selama 4 jam, penggerusan ulang selama 1 jam, kompaksi menjadi pelet, dan sintering pada suhu 800 °C selama 4 jam menggunakan metode reaksi dalam keadaaan padat. Detektor gas diuji pada suhu ruang dengan karakterisasi I-V, penentuan nilai sensitivitas, selektivitas, konduktivitas, waktu respon, dan karakterisasi XRD. Pengukuran karakteristik I-V menunjukkan bahwa sampel TiO2/ZnO didoping 4% mol Mg memiliki sensitivitas tertinggi yaitu 6,33 dengan tegangan 21 volt pada suhu ruang. Nilai selektivitas tertinggi terdapat pada sampel TiO2/ZnO didoping 2% mol Mg yaitu 1,54 dengan teganan 30 volt. Konduktivitas tertinggi terdapat pada sampel TiO2/ZnO didoping 6% mol Mg sebesar 18,54/Ωm pada lingkungan hidrogen. Waktu respon sampel TiO2/ZnO didoping 4% mol Mg pada tegangan 21 volt adalah 42 s. Hasil XRD menunjukkan bahwa sampel ZnO yang didoping Mg memiliki ukuran kristal yang lebih kecil dibandingkan dengan sampel ZnO tanpa doping.

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“…[10][11][12] Since its first report 60 years ago, resistor-type gas sensors with metal oxide conductive channels have been proven effective in detecting hazardous gases. 12 Accordingly, extensive efforts and most existing studies have focused on changing the morphology of metal oxides, such as doping a noble metal onto the metal oxide, 13 forming a heterojunction, [14][15][16] and changing the dimension of nanostructure. [17][18][19] As seen from these examples, previous research is mainly conducted considering material science.…”

Section: Materials Horizonsmentioning

confidence: 99%