Molybdenum-Loaded Anatase TiO2 Nanoparticles With Enhanced Optoelectronics Properties

Bargougui, R.; Ammar, Salah; Azzouz, Abdelkrim

doi:10.1007/s11664-016-4947-x

Cited by 7 publications

(9 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The distribution of the peaks indicates the presence of anatase, and the height and resolution of the peaks inform about the crystallinity of the catalysts [ 34 , 35 ]. Therefore, both the abundance of the anatase phase and the high and well-defined peaks are indicative of enhanced photocatalytic activity, since anatase shows a higher surface area and a higher density of active sites [ 12 , 27 , 36 , 37 ]. All the catalysts obtained have a crystalline structure composed of anatase.…”

Section: Resultsmentioning

confidence: 99%

Impact of the Precursor on the Physicochemical Properties and Photoactivity of TiO2 Nanoparticles Produced in Supercritical CO2

et al. 2023

View full text Add to dashboard Cite

The synthesis of TiO2 nanoparticles (NPs) in supercritical media has been reported over the last two decades. However, very few studies have compared the physicochemical characteristics and photoactivity of the TiO2 powders produced from different precursors, and even fewer have investigated the effect of using different ratios of hydrolytic agent/precursor (HA/P) on the properties of the semiconductor. To bridge this knowledge gap, this research focuses on the synthesis and characterization of TiO2 NPs obtained in a supercritical CO2 medium from four different TiO2 precursors, namely diisopropoxytitanium bis (acetylacetonate) (TDB), titanium (IV) isopropoxide (TIP), titanium (IV) butoxide (TBO), and titanium (IV) 2-ethylhexyloxide (TEO). Further, the effect of various HA/P ratios (10, 20, 30, and 40 mol/mol) when using ethanol as a hydrolytic agent has also been analyzed. Results obtained have shown that the physicochemical properties of the catalysts are not significantly affected by these variables, although some differences do exist between the synthesized materials and their catalytic performances. Specifically, photocatalysts obtained from TIP and TEO at the higher HA/P ratios (HA/P = 30 and HA/P = 40) led to higher CO2 photoconversions (6.3–7 µmol·g−1·h−1, Apparent Quantum Efficiency < 0.1%), about three times higher than those attained with commercial TiO2 P-25. These results have been imputed to the fact that these catalysts exhibit appropriate values of crystal size, surface area, light absorption, and charge transfer properties.

show abstract

Section: Resultsmentioning

confidence: 99%

Impact of the Precursor on the Physicochemical Properties and Photoactivity of TiO2 Nanoparticles Produced in Supercritical CO2

et al. 2023

View full text Add to dashboard Cite

show abstract

“…22 AC measurements were performed on 1 mm thick anatase TiO 2 pellets doped in situ with molybdenum nanoparticles (TiO 2 -Mo) in the frequency (f) range of 40 Hz ‡ f £ 100 kHz over 353 K ‡ T ‡ 883 K. Proton conduction along the TiO 2 -Mo surfaces is believed to be responsible for the increase in conductivity. 23 DC magnetronsputtered 30 nm thick TiO 2 films on p-GaAs (110) in the MIS structure showed the universal power-law dependence of AC conductivity r ac (f, T) on f (1 kHz £ f £ 1 MHz) for a temperature range of 80 K ‡ T ‡ 290 K. The results imply the existence of non-random distribution of hopping centers and surface states at the GaAs/TiO 2 interface. 24,25 However, reports of AC impedance measurements on MIS structures involving sol-gel TiO 2 films are limited.…”

mentioning

confidence: 85%

Dielectric Measurements on Sol–Gel Derived Titania Films

Çapan

Ray

2017

Journal of Elec Materi

View full text Add to dashboard Cite

Alternating current (AC) impedance measurements were performed on 37 nm thick nanostructured sol-gel derived anatase titania films on ultrasonically cleaned (100) p-silicon substrates at temperatures T ranging from 100 K to 300 K over a frequency range between 20 Hz and 1 MHz. The frequency-dependent behavior of the AC conductivity r ac (f, T) obeys the universal power law, and the values of the effective hopping barrier and hopping distance were found to be 0.79 eV and 6.7 9 10 À11 m from an analysis due to the correlated barrier-hopping model. The dielectric relaxation was identified as a thermally activated non-Debye process involving an activation energy of 41.5 meV.

show abstract

“…Doping with transition metals such as Fe, Cu, Cr, or Mo has a significant impact on absorption characteristics of TiO 2 . 153,154 The band gap and threshold energy of TiO 2 decrease with the increase in dopant concentration. 155,156 CeO 2 also has a synergic effect on optoelectronic properties of TiO 2 .…”

Section: Optoelectronic Applicationsmentioning

confidence: 99%

Bio-fabrication of TiO2 Nanomaterials and Their Applications in Electronics Devices

Chowdhury

Saini

Roy

2021

J. Electron. Mater.

View full text Add to dashboard Cite

Nano-biotechnology deals with the role of biological species in the field of nanotechnology and has gained significant attention in the last few decades. Nano-sized materials have superior physical, chemical, optical, electrical and mechanical properties in comparison with the bulk materials. A number of techniques have been employed so far to synthesize nano-structured materials, and among these, bio-inspired methods are found to be economically viable and environmentally sustainable. Titanium dioxide (TiO 2 ) is one of the most abundant and nontoxic transition metal oxides with high thermal stability, good oxidation and corrosion resistance, good hydrophobicity and non-wettability. All these properties along with a wide band gap make TiO 2 an important material for various applications in the fields of solar cells, sensors, batteries, and supercapacitors. In this review work, a comprehensive study has been carried out on the synthesis of TiO 2 nanoparticles (NPs) using different biological extracts and applications of TiO 2 NPs in the design and development of various electronic devices. KeywordsTiO 2 NPs • bio-fabrication • solar cells • lithium-ion batteries • supercapacitor • sensor * Jagannath Roy

show abstract

Molybdenum-Loaded Anatase TiO2 Nanoparticles With Enhanced Optoelectronics Properties

Cited by 7 publications

References 22 publications

Impact of the Precursor on the Physicochemical Properties and Photoactivity of TiO2 Nanoparticles Produced in Supercritical CO2

Impact of the Precursor on the Physicochemical Properties and Photoactivity of TiO2 Nanoparticles Produced in Supercritical CO2

Dielectric Measurements on Sol–Gel Derived Titania Films

Bio-fabrication of TiO2 Nanomaterials and Their Applications in Electronics Devices

Contact Info

Product

Resources

About