Effects of carbon doping on TiO2 for enhanced visible light-driven NO sensing performance

Kwak, Cheol Hwan; Im, Ui-Su; Seo, Sang Wan; Kim, Min Il; Huh, Yun Suk; Im, Ji Sun

doi:10.1016/j.matlet.2021.129313

Cited by 11 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where A is a photonic energy independent constant; h is the Planck constant; υ is th frequency of the photon; α is the absorption coefficient; and n depends on the type o transition (n = 1/2 for indirect transition and n = 2 for direct transition) [33][34][35]. According to this, the Eg values of PP2 and PP8 were 3.02 and 2.91 eV, respectively, slightly lowe than the actual Eg of typical TiO2 NPs, 3.14-3.24 eV [36,37]. Figure 7 shows the Tauc plot meant for drawing optical band-gap energy (E g ) from UV-Vis spectra.…”

Section: Resultsmentioning

confidence: 99%

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Rajendhiran¹,

Atchudan

Prakash³

et al. 2023

Coatings

View full text Add to dashboard Cite

Plant extracts have been utilized as an ecofriendly natural reducing agent for the synthesis of nanomaterials, including metal oxides. Prickly pear (opuntia) fruit extract (PPE) was used as a reducing agent for the sol–gel synthesis of titanium dioxide nanoparticles (TiO2 NPs) and as a sensitizer for the TiO2 NPs photoanode used in dye-sensitized solar cells (DSSCs). Ultraviolet-visible and infrared spectra, X-ray diffraction patterns, and scanning electron microscopic images were confirmed in the formation of semiconducting TiO2 NPs with the predominate size of ~300 nm. The use of PPE rendered discrete TiO2 NPs, whereas the typical synthesis without PPE resulted TiO2 aggregates. TiO2 NPs had a tetragonal crystalline structure, and their grain size was varied with respect to the concentration of PPE. The size of TiO2 crystallites was found to be 20, 19, 15, and 10 nm when the volume percentage of PPE was 0.2, 0.4, 0.6, and 0.8%, respectively. TiO2 NPs obtained using PPE were coated on indium-doped tin oxide substrates and sensitized with natural dye made up of PPE and synthetic dyes, namely rose Bengal (RB) and eosin yellow (EY). The photoanode fabricated with dye-sensitized TiO2 NPs was subjected to current–voltage response studies. The maximum power-conversion efficiency, 1.4%, was recorded for photoanodes sensitized with PPE dye, which is considerably higher than that for RB (1.16%) or EY (0.8%). Overall, the above findings proved that PPE can be used as a potential reducing/capping agent and TiO2 sensitizer for DSSC applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Rajendhiran¹,

Atchudan

Prakash³

et al. 2023

Coatings

View full text Add to dashboard Cite

show abstract

“…After annealing at 350 °C (TiO 2 -350, curve blue) and 550 °C (TiO 2 -550, curve green), the diffraction peaks at about 2θ = 25.28°, 37.79°, 48.05°, 53.88°, 55.06°, and 62.69° are ascribed to (101), (004), (200), (105), (211), and (204) planes of anatase TiO 2 (JCPDS card no. 21-1272) [ 16 ], suggesting that TiO 2 -350 and TiO 2 -550 exist in a pure anatase phase. After annealing at 750 °C (TiO 2 -750, curve purple), besides anatase diffraction peaks, the diffraction peaks at about 2θ = 27.49°, 36.15°, and 54.43° are assigned to the rutile TiO 2 (JCPDS card no.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Antibacterial Properties of TiO2 Nanospheres with Rutile/Anatase Heterophase Junctions and the Archival Paper Protection Application

2021

View full text Add to dashboard Cite

TiO2 has been generally studied for photocatalytic sterilization, but its antibacterial activities are limited. Herein, TiO2 nanospheres with rutile/anatase heterophase junctions are prepared by a wet chemical/annealing method. The large BET surface area and pore size are beneficial for the absorption of bacteria. The rutile/anatase heterojunctions narrow the bandgap, which enhances light absorption. The rutile/anatase heterojunctions also efficiently promote the photogenerated carriers’ separation, finally producing a high yield of radical oxygen species, such as •O2– and •OH, to sterilize bacteria. As a consequence, the obtained TiO2 nanospheres with rutile/anatase heterojunctions present an improved antibacterial performance against E. coli (98%) within 3 h of simulated solar light irradiation, exceeding that of TiO2 nanospheres without annealing (amorphous) and TiO2 nanospheres annealing at 350 and 550 °C (pure anatase). Furthermore, we design a photocatalytic antibacterial spray to protect the file paper. Our study reveals that the TiO2 nanospheres with rutile/anatase heterojunctions are a potential candidate for maintaining the durability of paper in the process of archival protection.

show abstract

“…The band gap width of Arg 300 and Arg 400 samples is close and is about 2.9 eV, in turn for Arg 550 and Air 450 samples, it is about 3.1 eV. A little decrease in the optical bandgap width of Arg 300 and Arg 400 samples compared to Arg 550 and Air 450 can be attributed to the presence of carbon and nitrogen in the material [36,39]. Registered carbon also can be associated with carbon dangling bonds.…”

Section: Functional Properties Investigationmentioning

confidence: 86%

Effect of Thermal Treatment of Symmetric TiO2 Nanotube Arrays in Argon on Photocatalytic CO2 Conversion

et al. 2022

View full text Add to dashboard Cite

Symmetric titania nanotube arrays (TiO2 NTs) are a well-known photocatalyst with a large surface area and band edge potentials suitable for redox reactions. Thermal treatment of symmetrical arrays of TiO2 nanotubes in argon was used to change the carbon content of the samples. The influence of the carbon content in the structure of symmetrical TiO2 NTs on their photoelectrochemical properties and photocatalytic activity in the conversion of CO2 into organic fuel precursors has been studied. The structure, chemical, and phase composition of obtained samples were studied by X-ray analysis, Raman spectroscopy, and SEM with energy dispersive analysis. It is established that carbon-related defects in the samples accumulate electrons on the surface required for the CO2 conversion reaction. It has been shown for the first time that varying the carbon content in symmetric TiO2 NTs arrays by annealing at different temperatures in argon makes it possible to control the yield of methane and methanol in CO2 conversion. It is revealed that too high a concentration of carbon dangling bonds promotes the growth of CO2 conversion efficiency but causes instability in this process. The obtained results show a high promise of symmetric carbon-doped TiO2 NTs arrays for the photocatalytic conversion of CO2.

show abstract

Effects of carbon doping on TiO2 for enhanced visible light-driven NO sensing performance

Cited by 11 publications

References 10 publications

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Enhanced Photocatalytic Antibacterial Properties of TiO2 Nanospheres with Rutile/Anatase Heterophase Junctions and the Archival Paper Protection Application

Effect of Thermal Treatment of Symmetric TiO2 Nanotube Arrays in Argon on Photocatalytic CO2 Conversion

Contact Info

Product

Resources

About