Surface State Controlled Superior Photodetection Properties of Isotype n-TiO2/In2O3Heterostructure Nanowire Array With High Specific Detectivity

Pooja, Pheiroijam; Chinnamuthu, P.

doi:10.1109/tnano.2019.2956960

Cited by 15 publications

(3 citation statements)

References 37 publications

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“…As a result, surface state is enhanced and a small shoulder PL emission is introduced at 402 nm (3.08 eV) and 465 nm (2.6 eV) related to oxygen vacancy in In 2 O 3 and TiO 2 respectively in TiO 2 -In 2 O 3 NW samples annealed at 800 °C 33,34 . Moreover, the main-band related PL emission at 340 nm for In 2 O 3 and 360 nm for TiO 2 as obtained in our previous work for TiO 2 35 is shifted towards shorter wavelength with increase in annealing temperature. This blue-shift cannot be related to quantum confinement 36 but can be attributed to the widening of energy bandgap with increase in the grain size, which is a function of annealing temperature.…”

Section: Resultssupporting

confidence: 74%

“…The as-deposited samples exhibits a higher θ WCA of 140° compared to annealed samples. As reported by the author 35 , as-deposited NWs structure are porous due to gap between consecutive NWs. The under-grown NWs arising due to shadowing effect creates more air gaps between the NWs and the air trapped in the gap reduces the fractional coverage at solid-liquid interface which decreases the van der waal forces at the surface.…”

Section: Resultsmentioning

confidence: 56%

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Annealing Effect of Glancing Angle Electron Beam Deposited TiO2/In2O3 Nanowires Array on Surface Wettability

Pooja

Chinnamuthu

2020

Sci Rep

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Pheiroijam pooja & Chinnamuthu p. ✉ tio 2 /in 2 o 3 nanowire (NW) array are prepared using catalyst free glancing angle deposition technique. The wettability of TiO 2 /in 2 o 3 NW surface are tuned and controlled by the annealing treatment without altering the surface with additional chemical coating. The phase change, surface roughness, change in static and dynamic contact angles due to the heat treatment are studied. Moreover, the surface properties such as frictional force and work of adhesion are calculated for all the samples. The samples annealed at 600 °C shows nearly superhydrophilic with static water contact angle of 12°, frictional force of 85.00748 µN and work of adhesion of 142.3721 mN/m. The surface of TiO 2 /in 2 o 3 NW is controlled to attain desired water contact angles and sliding angles, which is paramount for designing practical application in self-cleaning, electronic and biomedical fields. Surfaces with superhydrophilic wetting nature have been used in numerous applications such as anti-fogging, self-cleaning coatings and tissue reconstruction 1-5. Controlling the wettability of surface is desirable in various technical applications. In recent years, efforts have been made to improve the hydrophilicity of thin films. There are works on improvement of hydrophilicity using UV illumination of metaloxide films such as TiO 2 , SnO 2 and ZnO either doping by metal or non-metal 6,7. However, there are limitations in the application of these metal oxides for use as a reliable superhydrophilic coating and thus need to be checked. For practical application, surface of the film cannot be illuminated with UV light all the time and there is need of long lasting hydrophilicity in absence of UV illumination for anti-fogging surfaces, specifically in outdoor applications. We have reported on designing vertical stacked coaxial TiO 2-In 2 O 3 heterostructure nanowire (NW) , which studies on photoinduced hydrophilicity after UV-illumination 8. There are also reports on hydrophobic to hydrophilic conversion using surface derivatization, chemical grafting, wet chemical reactions and also modifying hydrophobic cross linked high internal phase emulsion polymer (polyHIPE) using styrene 9-11. Problems associated with these techniques are difficulties in implementation, high cost, polymer degradation possibility and scale up issues for large industrial production. There is no report on study of tuning the wettability of coaxial TiO 2-In 2 O 3 NW from hydrophobic to hydrophilic through simple heat treatment. Moreover, before TiO 2 /In 2 O 3 NWs are utilized successfully, annealing is necessary to improve the NWs crystallinity. During elevated annealing temperature, the solid-state sintering of TiO 2 nanostructure subsequently causes structure breakdown. Such results are more noticeable when there is enhanced mass transport and bond breaking during phase transformation from anatase to rutile 12,13. In case of In 2 O 3 , at elevated annealing temperature the grain stops growing or exhibits amorphous nature 14,15. Therefo...

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 56%

Annealing Effect of Glancing Angle Electron Beam Deposited TiO2/In2O3 Nanowires Array on Surface Wettability

Pooja

Chinnamuthu

2020

Sci Rep

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“…Amidst them, TiO 2 is vastly studied due to its effective photocatalytic activity as it washes off dirt or decomposes organic contaminants from surfaces [34]. Moreover, TiO 2 is known for its nontoxicity, chemical, and thermal stability [16,35,36]. Moreover, growth of perpendicularly aligned coaxial TiO 2 /In 2 O 3 NW on Si substrate is problematic due to limited growth techniques.…”

Section: Wettability Applicationmentioning

confidence: 99%

Synthesis of Nanowire Using Glancing Angle Deposition and Their Applications

Chinnamuthu¹,

Pooja²,

Singh³

2021

Nanowires - Recent Progress

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Nanowires are highly attractive for advanced nanoelectronics and nanoscience applications, due to its novel properties such as increased surface area, large aspect ratio, and increased surface scattering of electrons and phonons. The design and fabrication of nanowires array provide a great platform to overcome the challenges/limitation of its counter partner. This chapter focuses on the synthesis of metal oxide nanowire and axial heterostructure nanowire array using the Glancing angle deposition (GLAD) technique. The structural, optical and electrical properties are studied. This GLAD technique offers control over one-dimensional (1D) nanostructure growth with self-alignment capability. It is also reviewed in an effort to cover the various application in this area of optoelectronic devices and wettability applications that had been synthesized using GLAD.

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Surface-Plasmon-Induced Ag Nanoparticles Decorated In2O3 Nanowires for Low Noise Photodetectors

Nath

Sarkar

2020

Plasmonics

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Surface State Controlled Superior Photodetection Properties of Isotype n-TiO₂/In₂O₃Heterostructure Nanowire Array With High Specific Detectivity

Cited by 15 publications

References 37 publications

Annealing Effect of Glancing Angle Electron Beam Deposited TiO2/In2O3 Nanowires Array on Surface Wettability

Annealing Effect of Glancing Angle Electron Beam Deposited TiO2/In2O3 Nanowires Array on Surface Wettability

Synthesis of Nanowire Using Glancing Angle Deposition and Their Applications

Surface-Plasmon-Induced Ag Nanoparticles Decorated In2O3 Nanowires for Low Noise Photodetectors

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