Dopant controlled photoinduced hydrophilicity and photocatalytic activity of SnO2 thin films

Background: Nosocomial infections are important health problems and a cause of complications and death in hospitalized patients. This problem should be solved from the preventive angle, avoiding the spread of infections by designing disinfection methods based on the photocatalytic activity of semiconductor materials like Tin Oxide (SnO2). Methods: Antimicrobial activity of UV light was tested using Candida albicans ATCC10231 inoculation of SnO2 thin films by counting colony forming units (UFC). Interaction of UV light with SnO2 was analyzed by the Density Functional Theory (DFT) and the extension to Hubbard model (DFT+U) schemes to predict the electrons behavior in a subatomic level. Results: After exposure to UV light, C. albicans had a reduction of 36.5% of viable cells, and when SnO2 was included, cells were reduced by 60.2%. Measures of the electronics structure obtained by the first principle calculations under the DFT and DFT+U schemes showed that O-p orbitals mediate the oxidation process in the bulk semiconductor. By including the surface effects when cleaving the (1 0 0) plane, the three orbitals O-p, Sn-p, and Sn-s are the mediators. Conclusions: SnO2 films are promising antimicrobial coatings because UV light has a synergic activity with thin films, resulting in a faster disinfection.

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MOCVD and properties of in situ doped Pt-SnO2 thin films

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:1999881 ◽

1999 ◽

Vol 09 (PR8) ◽

pp. Pr8-643-Pr8-650 ◽

Cited By ~ 1

Author(s):

M. Amjoud ◽

F. Maury

Keyword(s):

Thin Films ◽

Sno2 Thin Films

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Photocatalytic degradation of methylene blue from aqueous solutions using nanopillars-TiO2 thin films: Batch reactor studies

Science Vision ◽

10.33493/scivis.18.03.01 ◽

2018 ◽

Vol 18 (3) ◽

pp. 81-91 ◽

Cited By ~ 1

Author(s):

C. Lalhriatpuia

Keyword(s):

Thin Films ◽

Methylene Blue ◽

Photocatalytic Activity ◽

Organic Carbon ◽

Photocatalytic Degradation ◽

Batch Reactor ◽

Tio2 Thin Films ◽

Initial Concentration ◽

Bet Specific Surface Area ◽

Interfering Ions

Nanopillars-TiO2 thin films was obtained on a borosilicate glass substrate with (S1) and without (S2) polyethylene glycol as template. The photocatalytic behaviour of S1 and S2 thin films was assessed inthe degradation of methylene blue (MB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the SEM, XRD, FTIR and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data confirmed that the TiO2 particles are in its anatase mineral phase. The SEM and AFM images indicated the catalyst is composed with nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of MB was well studied at wide range of physico-chemical parameters. The effect of solution pH (pH 4.0 to 10.0) and MB initial concentration (1.0 to 10.0 mg/L) was extensively studied and the effect of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of MB was demonstrated. The maximum percent removal of MB was observed at pH 8.0 beyond which it started decreasing and a low initial concentration of the pollutant highly favoured the photocatalytic degradation using thin films and the presence of several interfering ions diminished the photocatalytic activity of thin films to some extent. The overall photocatalytic activity was in the order: S2 > S1 > UV. The photocatalytic degradation of MB was followed the pseudo-first-order rate kinetics. The mineralization of MB was studied with total organic carbon measurement using the TOC (total organic carbon) analysis.

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Structural and optical properties of Tin Oxide and Indium doped SnO2 thin films deposited by thermal evaporation technique

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v12i3.45 ◽

2016 ◽

Vol 12 (3) ◽

pp. 4394-4399

Author(s):

Sura Ali Noaman ◽

Rashid Owaid Kadhim ◽

Saleem Azara Hussain

Keyword(s):

Thin Films ◽

Optical Properties ◽

Tin Oxide ◽

Thermal Evaporation ◽

Pure Sno2 ◽

X Ray Diffraction ◽

Structural And Optical Properties ◽

X Ray ◽

Evaporation Technique ◽

Sno2 Thin Films

Tin Oxide and Indium doped Tin Oxide (SnO2:In) thin films were deposited on glass and SiliconÂ substratesÂ byÂ thermal evaporation technique.Â X-ray diffraction pattern of Â pure SnO2 and SnO2:In thin films annealed at 650oC and the results showedÂ that the structure have tetragonal phase with preferred orientation in (110) plane. AFM studies showed an inhibition of grain growth with increase in indium concentration. SEM studies of pureÂ SnO2 and Â Indium doped tin oxide (SnO2:In) ) thin films showed that the films with regular distribution of particles and they have spherical shape.Â Optical properties such asÂ Transmission , optical band-gap have been measured and calculated.

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STRUCTURAL, OPTICAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF NANOCRYSTALLINE TiO2 THIN FILMS DEPOSITED BY SOL-GEL SPIN COATING

i-manager s Journal on Material Science ◽

10.26634/jms.7.1.15719 ◽

2019 ◽

Vol 7 (1) ◽

pp. 28

Author(s):

KOMARAIAH DURGAM ◽

RADHA EPPA ◽

REDDY M. V. RAMANA ◽

KUMAR J. SIVA ◽

R. SAYANNA ◽

...

Keyword(s):

Thin Films ◽

Optical Properties ◽

Photocatalytic Activity ◽

Spin Coating ◽

Sol Gel ◽

Tio2 Thin Films ◽

Nanocrystalline Tio2

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Use of Nanopillars-TiO2 Thin Films in the Photocatalytic Degradation of Bromophenol Blue from Aqueous Solution

Science & Technology Journal ◽

10.22232/stj.2018.06.01.03 ◽

2018 ◽

Vol 6 (1) ◽

pp. 22-30

Author(s):

C. Lalhriatpuia ◽

◽

Thanhming liana ◽

K. Vanlaldinpuia

Keyword(s):

Thin Films ◽

Aqueous Solution ◽

Photocatalytic Activity ◽

Photocatalytic Degradation ◽

Batch Reactor ◽

Bromophenol Blue ◽

Tio2 Thin Films ◽

Initial Concentration ◽

Bet Specific Surface Area ◽

Interfering Ions

The photocatalytic activity of Nanopillars-TiO2 thin films was assessed in the degradation of Bromophenol blue (BPB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the XRD, SEM and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data showed anatase phase of TiO2 particles with average particle size of 25.4 and 21.9 nm, for S1 and S2 catalysts respectively. The SEM and AFM images indicated the catalyst composed with Nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The average height of the pillars was found to be 180 and 40 nm respectively for the S1 and S2 catalyst. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of BPB using the UV light was studied at wide range of physico-chemical parametric studies to determine the mechanism of degradation as well as the practical applicability of the technique. The batch reactor operations were conducted at varied pH (pH 4.0 to 10.0), BPB initial concentration (1.0 to 20.0 mg/L) and presence of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of BPB. The maximum percent removal of BPB was observed at pH 6.0 and a low initial concentration of the pollutant highly favours the photocatalytic degradation using thin films. The presence of several interfering ions suppressed the photocatalytic activity of thin films to some extent. The time dependence photocatalytic degradation of BPB was demonstrated with the pseudo-first-order rate kinetics. Study was further extended with total organic carbon measurement using the TOC (Total Organic Carbon) analysis. This demonstrated an apparent mineralization of BPB from aqueous solutions.

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