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Nanostructured PdO Thin Film from Langmuir-Blodgett Precursor for Room-Temperature H2 Gas Sensing.
ACS Appl Mater Interfaces 2016; 8(26):16997-7003AA

Abstract

Nanoparticulate thin films of PdO were prepared using the Langmuir-Blodgett (LB) technique by thermal decomposition of a multilayer film of octadecylamine (ODA)-chloropalladate complex. The stable complex formation of ODA with chloropalladate ions (present in subphase) at the air-water interface was confirmed by the surface pressure-area isotherm and Brewster angle microscopy. The formation of nanocrystalline PdO thin film after thermal decomposition of as-deposited LB film was confirmed by X-ray diffraction and Raman spectroscopy. Nanocrystalline PdO thin films were further characterized by using UV-vis and X-ray photoelectron spectroscopic (XPS) measurements. The XPS study revealed the presence of prominent Pd(2+) with a small quantity (18%) of reduced PdO (Pd(0)) in nanocrystalline PdO thin film. From the absorption spectroscopic measurement, the band gap energy of PdO was estimated to be 2 eV, which was very close to that obtained from specular reflectance measurements. Surface morphology studies of these films using atomic force microscopy and field-emission scanning electron microscopy indicated formation of nanoparticles of size 20-30 nm. These PdO film when employed as a chemiresistive sensor showed H2 sensitivity in the range of 30-4000 ppm at room temperature. In addition, PdO films showed photosensitivity with increase in current upon shining of visible light.

Authors+Show Affiliations

Chemistry Division, ‡Technical Physics Division, and §Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai 400085, India.Chemistry Division, ‡Technical Physics Division, and §Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai 400085, India.Chemistry Division, ‡Technical Physics Division, and §Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai 400085, India.Chemistry Division, ‡Technical Physics Division, and §Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai 400085, India.Chemistry Division, ‡Technical Physics Division, and §Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai 400085, India.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27299704

Citation

Choudhury, Sipra, et al. "Nanostructured PdO Thin Film From Langmuir-Blodgett Precursor for Room-Temperature H2 Gas Sensing." ACS Applied Materials & Interfaces, vol. 8, no. 26, 2016, pp. 16997-7003.
Choudhury S, Betty CA, Bhattacharyya K, et al. Nanostructured PdO Thin Film from Langmuir-Blodgett Precursor for Room-Temperature H2 Gas Sensing. ACS Appl Mater Interfaces. 2016;8(26):16997-7003.
Choudhury, S., Betty, C. A., Bhattacharyya, K., Saxena, V., & Bhattacharya, D. (2016). Nanostructured PdO Thin Film from Langmuir-Blodgett Precursor for Room-Temperature H2 Gas Sensing. ACS Applied Materials & Interfaces, 8(26), pp. 16997-7003. doi:10.1021/acsami.6b04120.
Choudhury S, et al. Nanostructured PdO Thin Film From Langmuir-Blodgett Precursor for Room-Temperature H2 Gas Sensing. ACS Appl Mater Interfaces. 2016 Jul 6;8(26):16997-7003. PubMed PMID: 27299704.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Nanostructured PdO Thin Film from Langmuir-Blodgett Precursor for Room-Temperature H2 Gas Sensing. AU - Choudhury,Sipra, AU - Betty,C A, AU - Bhattacharyya,Kaustava, AU - Saxena,Vibha, AU - Bhattacharya,Debarati, Y1 - 2016/06/24/ PY - 2016/6/15/entrez PY - 2016/6/15/pubmed PY - 2016/6/15/medline KW - Langmuir−Blodgett film KW - PdO thin film KW - interdigitated hydrocarbon KW - photosensitivity KW - room temperature H2 sensing SP - 16997 EP - 7003 JF - ACS applied materials & interfaces JO - ACS Appl Mater Interfaces VL - 8 IS - 26 N2 - Nanoparticulate thin films of PdO were prepared using the Langmuir-Blodgett (LB) technique by thermal decomposition of a multilayer film of octadecylamine (ODA)-chloropalladate complex. The stable complex formation of ODA with chloropalladate ions (present in subphase) at the air-water interface was confirmed by the surface pressure-area isotherm and Brewster angle microscopy. The formation of nanocrystalline PdO thin film after thermal decomposition of as-deposited LB film was confirmed by X-ray diffraction and Raman spectroscopy. Nanocrystalline PdO thin films were further characterized by using UV-vis and X-ray photoelectron spectroscopic (XPS) measurements. The XPS study revealed the presence of prominent Pd(2+) with a small quantity (18%) of reduced PdO (Pd(0)) in nanocrystalline PdO thin film. From the absorption spectroscopic measurement, the band gap energy of PdO was estimated to be 2 eV, which was very close to that obtained from specular reflectance measurements. Surface morphology studies of these films using atomic force microscopy and field-emission scanning electron microscopy indicated formation of nanoparticles of size 20-30 nm. These PdO film when employed as a chemiresistive sensor showed H2 sensitivity in the range of 30-4000 ppm at room temperature. In addition, PdO films showed photosensitivity with increase in current upon shining of visible light. SN - 1944-8252 UR - https://www.unboundmedicine.com/medline/citation/27299704/Nanostructured_PdO_Thin_Film_from_Langmuir_Blodgett_Precursor_for_Room_Temperature_H2_Gas_Sensing_ L2 - https://dx.doi.org/10.1021/acsami.6b04120 DB - PRIME DP - Unbound Medicine ER -