Band alignment and depletion zone at ZnO/CdS and ZnO/CdSe hetero-structures for temperature independent ammonia vapor sensing

2016 ◽  
Vol 18 (47) ◽  
pp. 32057-32071 ◽  
Author(s):  
N. Rajeswari Yogamalar ◽  
K. Sadhanandham ◽  
A. Chandra Bose ◽  
R. Jayavel
Keyword(s):  
Band Alignment ◽  
Cds Nanoparticles ◽  
Ammonia Vapor ◽  
Depletion Zone ◽  
Vapor Sensing

The excitation of CdS nanoparticles and the narrowing of depletion zone formed between the ZnO and CdS hetero-structures determine the sensing of ammonia vapor.

Cadmium Sulphide Sensitized Crystal Facet Tailored Nanostructured Nickel Ferrite @ Hematite Core-Shell Ternary Heterojunction Photoanode for Photoelectrochemical Water Splitting

MRS Advances ◽  
2020 ◽  
Vol 5 (50) ◽  
pp. 2585-2593
Author(s):  
Soumyajit Maitra ◽  
Arundhati Sarkar ◽  
Toulik Maitra ◽  
Somoprova Halder ◽  
Subhasis Roy ◽  
...  
Keyword(s):  
Water Splitting ◽  
Cadmium Sulphide ◽  
Band Alignment ◽  
Photoelectrochemical Water Splitting ◽  
Cds Nanoparticles ◽  
Core Shell ◽  
Xenon Lamp ◽  
Photoelectrochemical Performance ◽  
Crystal Facet ◽  
Hydrothermal Approach

AbstractDesign of composite semiconductor nanostructures with proper band alignment for efficient charge separation and carrier transport has been at the center of research for photoelectrochemical water splitting. This work demonstrates the deposition of a NiFe2O4 @Fe2O3 core-shell nanostructured film sensitized with CdS to form a ternary heterojunction for cascade type electron transfer. The hematite nanostructures were grown by hydrothermal approach through dipping into a solution of Nickel Nitrate yielded anchoring of Ni2+ ions on the outer surface. The films were then annealed at 650 0C for the diffusion of Ni2+ ions into the hematite lattice which forms core-shell NiFe2O4 @Fe2O3 heterojunction. The films were further sensitized with CdS nanoparticles deposited by a hydrothermal approach to form the final ternary heterojunction photoanode. Several different nanostructures were grown and the effect of crystal facet tailoring was observed on Ni loading and photoelectrochemical performance. The photoelectrochemical measurements were carried out using a potentiostat under 100 mW/cm2 light source (150W Xenon Lamp) with Pt counter electrode and 0.5 M Na2S and 0.5 M Na2SO3 electrolyte. A current density of 3.47 mA/cm2 was observed at 1.23 V (vs Ag/AgCl). An Applied Bias to Photocurrent Efficiency (ABPE) of 1.8 % photoconversion efficiency was observed using the fabricated electrodes at 0.288V (vs Ag/AgCl).

Improved ammonia vapor sensing properties of Al-doped ZnO nanoparticles prepared by sol-gel process

2021 ◽  
Author(s):  
I Loyola Poul Raj ◽  
S Gobalakrishnan ◽  
P.K Praseetha ◽  
Natarajan Chidhambaram ◽  
S S. Saravanakumar ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Sol Gel ◽  
Ammonia Vapor ◽  
Sensing Properties ◽  
Vapor Sensing ◽  
Sol Gel Process ◽  
Doped Zno

SILAR-coated Mg-doped ZnO thin films for ammonia vapor sensing applications

2020 ◽  
Vol 31 (13) ◽  
pp. 10186-10195 ◽  
Author(s):  
K. Radhi Devi ◽  
G. Selvan ◽  
M. Karunakaran ◽  
K. Kasirajan ◽  
L. Bruno Chandrasekar ◽  
...  
Keyword(s):  
Thin Films ◽  
Zno Thin Films ◽  
Ammonia Vapor ◽  
Vapor Sensing ◽  
Sensing Applications ◽  
Doped Zno ◽  
Mg Doped
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