Solution processing of CuSe quantum dots: Photocatalytic activity under RhB for UV and visible-light solar irradiation

Kaviyarasu, K.; Ayeshamariam, A.; Manikandan, E.; Kennedy, J.; Ladchumananandasivam, Rasiah; Gomes, Uílame Umbelino; Jayachandran, M.; Maaza, M.

doi:10.1016/j.mseb.2016.05.002

Cited by 169 publications

(35 citation statements)

References 27 publications

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“…The ability of Ce-Ti-O to adsorb the RhB dye was higher than that for pure Ce, which is apparent from the curve. The smaller particle size of CeTi than that of pure Ti may play an important role in the adsorption process61626364. This is likely because smaller particles have higher surface areas.…”

Section: Resultsmentioning

confidence: 99%

Photodegradation of organic pollutants RhB dye using UV simulated sunlight on ceria based TiO2 nanomaterials for antibacterial applications

Kaviyarasu

Kennedy

Manikandan

et al. 2016

Sci Rep

388

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To photo-catalytically degrade RhB dye using solar irradiation, CeO 2 doped TiO 2 nanocomposites were synthesized hydrothermally at 700 °C for 9 hrs. All emission spectra showed a prominent band centered at 442 nm that was attributed to oxygen related defects in the CeO 2 -TiO 2 nanocrystals. Two sharp absorption bands at 1418 cm −1 and 3323 cm −1 were attributed to the deformation and stretching vibration, and bending vibration of the OH group of water physisorbed to TiO 2 , respectively. The photocatalytic activities of Ce-TiO 2 nanocrystals were investigated through the degradation of RhB under UV and UV+ visible light over a period of 8 hrs. After 8 hrs, the most intense absorption peak at 579 nm disappeared under the highest photocatalytic activity and 99.89% of RhB degraded under solar irradiation. Visible light-activated TiO 2 could be prepared from metal-ion incorporation, reduction of TiO 2 , non-metal doping or sensitizing of TiO 2 using dyes. Studying the antibacterial activity of Ce-TiO 2 nanocrystals against E. coli revealed significant activity when 10 μg was used, suggesting that it can be used as an antibacterial agent. Its effectiveness is likely related to its strong oxidation activity and superhydrophilicity. This study also discusses the mechanism of heterogeneous photocatalysis in the presence of TiO 2 . Solar energy is uniquely poised to solve major energy and environmental challenges that are being faced by humankind. As such, it is important to develop a suitable environmentally-friendly technology that permits the full range of the solar spectrum to be used for simultaneously solving energy and environmental challenges. It has been proposed that it is possible to address these challenges using nanocomposite materials that are capable of solar photocatalytic conversion 1,2 . Nanocomposite materials have a mixture of different chemical compositions and have received wide interest from fundamental and applied science researchers. The physical properties of these materials can be combined to produce materials that have desirable characteristics. Optical or biological characteristics can change with decreasing particle sizes, which is a major reason for interest in nanocomposite materials 3 . For example, metal oxide nanocomposites have excellent physical properties, such as high hardness and melting points, low densities and coefficients of thermal expansion, high thermal conductivities, good chemical stabilities. They also have improved mechanical properties, such as higher specific strengths, better wear resistance and specific modulus, and have wide potential for various industrial fields 4,5 .

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Section: Resultsmentioning

confidence: 99%

Photodegradation of organic pollutants RhB dye using UV simulated sunlight on ceria based TiO2 nanomaterials for antibacterial applications

Kaviyarasu

Kennedy

Manikandan

et al. 2016

Sci Rep

388

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“…Stoichiometry and phase have been shown to have strong influence on the band gap and thermal stability of the material . Recently, the synthesis of size‐quantized particles of copper selenides has attracted a lot of interest in the science community …”

Section: Introductionmentioning

confidence: 99%

Mercaptoalkanoic Acid‐Induced Band Gap Attenuation of Copper Selenide Quantum Dot

et al. 2020

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Copper selenide quantum dot (CuSeQD) materials functionalised with mercaptoalkanoic acids {3-mercaptopropionic acid (3-MPA), 6-mercaptohexanoic acid (6-MHA) and mercaptosuccinic acid (MSA)} were synthesized by a reproducible aqueous colloidal technique at room temperature. The impact of the capping agents on the size and the crystallinity of the CuSeQD materials, were investigated by small angle X-ray scattering (SAXS) and X-ray diffraction (XRD) spectroscopic techniques, respectively. SAXS results confirmed that 6-MHA-CuSeQD had the smallest average particle core size when dried, whereas MSA-CuSeQD had the smallest size in aqueous solution, though with a tendency to aggregate. Dynamic light scattering (DLS) measurements indicated strong bonding of the capping agents to CuSe particles, with MSA being the weakest binding agent, as confirmed by comparatively, low Zeta potential(ζ = À 31.1 mV) and high polydispersity index (0.469) values. UV-Vis absorption studies confirmed a large blue shift of the band gap for the QD compared to the bulk material, with characteristic absorption band (λ) and direct band gap (E gd ) values being (λ = 435 nm, E gd = 8.0 eV), (λ = 400 nm, E gd = 5.6 eV) and (λ = 340 nm, E gd = 4.0 eV), for 6-MHA-CuSeQD, 3-MPA-CuSeQD and MSA-CuSeQD, respectively. As supported by the formal potential values for 6-MHA-CuSeQD (E 0' � 120 mV), 3-MPA-CuSeQD (E 0' � 159 mV) and MSA-CuSeQD (E 0' � 183 mV), the smaller the particle size, the lower the potential required for the application of the quantum dots in an electron transfer process.[a] L.

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“…Doping with metal ions as (Zn, Co, Sr, and Gd) was aimed to improve the physicochemical properties of ferrite nanoparticles (NPs) essential for their applications such as photocatalysis [10, 11] in photodegradation of dyes and as antibacterial agents [12, 13], industrial applications [14], and electrochemical energy storage materials [15, 16]. Studies confirmed that doping influences the structural [17], optical [18], electrical [17, 19], infrared radiation properties [20, 21], and magnetic properties [22, 23].…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

et al. 2017

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The effect of Zn-doping in CoFe2O4 nanoparticles (NPs) through chemical co-precipitation route was investigated in term of structural, optical, and magnetic properties. Both XRD and FTIR analyses confirm the formation of cubic spinel phase, where the crystallite size changes with Zn content from 46 to 77 nm. The Scherrer method, Williamson-Hall (W-H) analysis, and size-strain plot method (SSPM) were used to study of crystallite sizes. The TEM results were in good agreement with the results of the SSP method. SEM observations reveal agglomeration of fine spherical-like particles. The optical band gap energy determined from diffuse reflectance spectroscopy (DRS) varies increases from 1.17 to 1.3 eV. Magnetization field loops reveal a ferromagnetic behavior with lower hysteresis loop for higher Zn content. The magnetic properties are remarkably influenced with Zn doping; saturation magnetization (Ms) increases then decreases while both coercivity (HC) and remanent magnetization (Mr) decrease continuously, which was associated with preferential site occupancy and the change in particle size.

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Solution processing of CuSe quantum dots: Photocatalytic activity under RhB for UV and visible-light solar irradiation

Cited by 169 publications

References 27 publications

Photodegradation of organic pollutants RhB dye using UV simulated sunlight on ceria based TiO2 nanomaterials for antibacterial applications

Photodegradation of organic pollutants RhB dye using UV simulated sunlight on ceria based TiO2 nanomaterials for antibacterial applications

Mercaptoalkanoic Acid‐Induced Band Gap Attenuation of Copper Selenide Quantum Dot

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

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