Electrochemical and fluorescence properties of SnO2 thin films and its antibacterial activity

Henry, J.; Mohanraj, K.; Sivakumar, G.; Umamaheswari, S.

doi:10.1016/j.saa.2015.02.034

Cited by 39 publications

(7 citation statements)

References 44 publications

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“…The fluorescence spectra of the QD0 sample with the concentration of 0.2 and 0.002 mol/L are shown in Figure 6. The emission peaks at 300 nm were in agreement with the previous report [36]. The fluorescence quenching was observed when the concentration was as high as 0.2 mol/L.…”

Section: Resultssupporting

confidence: 92%

Preparation of Tin Oxide Quantum Dots in Aqueous Solution and Applications in Semiconductor Gas Sensors

et al. 2019

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Tin oxide quantum dots (QDs) were prepared in aqueous solution from the precursor of tin dichloride via a simple process of hydrolysis and oxidation. The average grain size of QDs was 1.9 nm. The hydrothermal treatment was used to control the average grain size, which increased to 2.7 and 4.0 nm when the operating temperatures of 125 and 225 °C were employed, respectively. The X-ray photoelectron spectroscopy (XPS) spectrum and X-ray diffraction analysis (XRD) pattern confirmed a rutile SnO2 system for the QDs. A band gap of 3.66 eV was evaluated from the UV-VIS absorption spectrum. A fluorescence emission peak was observed at a wavelength of 300 nm, and the response was quenched by the high concentration of QDs in the aqueous solution. The current-voltage (I-V) correlation inferred that grain boundaries had the electrical characteristics of the Schottky barrier. The response of the QD thin film to H2 gas revealed its potential application in semiconductor gas sensors.

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Section: Resultssupporting

confidence: 92%

Preparation of Tin Oxide Quantum Dots in Aqueous Solution and Applications in Semiconductor Gas Sensors

et al. 2019

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“…The quenching mechanism has been proven to be complex [39,40], in which the heavy metal ions interfere with the fluorescence emission by adsorbing the energy of electron transition from conduction band to valence band. The prepared SnO 2 QDs have an emission peak at 300 nm, in agreement with the previous report [41]. The position of the emission peak remained the same after the incorporation of heavy metals, revealing that the band gap had not shifted.…”

Section: Resultssupporting

confidence: 91%

Fluorescence Characteristics of Aqueous Synthesized Tin Oxide Quantum Dots for the Detection of Heavy Metal Ions in Contaminated Water

et al. 2019

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Tin oxide quantum dots were synthesized in aqueous solution via a simple hydrolysis and oxidation process. The morphology observation showed that the quantum dots had an average grain size of 2.23 nm. The rutile phase SnO2 was confirmed by the structural and compositional characterization. The fluorescence spectroscopy of quantum dots was used to detect the heavy metal ions of Cd2+, Fe3+, Ni2+ and Pb2+, which caused the quenching effect of photoluminescence. The quantum dots showed the response of 2.48 to 100 ppm Ni2+. The prepared SnO2 quantum dots exhibited prospective in the detection of heavy metal ions in contaminated water, including deionized water, deionized water with Fe3+, reclaimed water and sea water. The limit of detection was as low as 0.01 ppm for Ni2+ detection. The first principle calculation based on the density function theory demonstrated the dependence of fluorescence response on the adsorption energy of heavy metal ions as well as ion radius. The mechanism of fluorescence response was discussed based on the interaction between Sn vacancies and Ni2+ ions. A linear correlation of fluorescence emission intensity against Ni2+ concentration was obtained in the logarithmic coordinates. The density of active Sn vacancies was the crucial factor that determined fluorescence response of SnO2 QDs to heavy metal ions.

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“…Nanocrystalline SnO 2 thin films deposited by sol-gel exhibited antibacterial activity against E. coli and Bacillus spp. [42] as well. Fakhri et al [43] also had reported antifungal activity of SnO 2 and SnS 2 nanoparticles, and SnO 2 /SnS 2 nanocomposites against C. albicans.…”

Section: Discussionmentioning

confidence: 94%

Antimicrobial and anti-biofilm properties of polypropylene meshes coated with metal-containing DLC thin films

Cazalini

Miyakawa

Teodoro

et al. 2017

J Mater Sci: Mater Med

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A promising strategy to reduce nosocomial infections related to prosthetic meshes is the prevention of microbial colonization. To this aim, prosthetic meshes coated with antimicrobial thin films are proposed. Commercial polypropylene meshes were coated with metal-containing diamond-like carbon (Me-DLC) thin films by the magnetron sputtering technique. Several dissimilar metals (silver, cobalt, indium, tungsten, tin, aluminum, chromium, zinc, manganese, tantalum, and titanium) were tested and compositional analyses of each Me-DLC were performed by Rutherford backscattering spectrometry. Antimicrobial activities of the films against five microbial species (Candida albicans, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Enterococcus faecalis) were also investigated by a modified Kirby-Bauer test. Results showed that films containing silver and cobalt have inhibited the growth of all microbial species. Tungsten-DLC, tin-DLC, aluminum-DLC, zinc-DLC, manganese-DLC, and tantalum-DLC inhibited the growth of some strains, while chromium- and titanium-DLC weakly inhibited the growth of only one tested strain. In-DLC film showed no antimicrobial activity. The effects of tungsten-DLC and cobalt-DLC on Pseudomonas aeruginosa biofilm formation were also assessed. Tungsten-DLC was able to significantly reduce biofilm formation. Overall, the experimental results in the present study have shown new approaches to coating polymeric biomaterials aiming antimicrobial effect.

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Electrochemical and fluorescence properties of SnO2 thin films and its antibacterial activity

Cited by 39 publications

References 44 publications

Preparation of Tin Oxide Quantum Dots in Aqueous Solution and Applications in Semiconductor Gas Sensors

Preparation of Tin Oxide Quantum Dots in Aqueous Solution and Applications in Semiconductor Gas Sensors

Fluorescence Characteristics of Aqueous Synthesized Tin Oxide Quantum Dots for the Detection of Heavy Metal Ions in Contaminated Water

Antimicrobial and anti-biofilm properties of polypropylene meshes coated with metal-containing DLC thin films

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