A modified version of BRDF model based on Kubelka-Munk theory for coating materials

Yang, Min; Xu, Wenbin; Li, Junwei; Zhou, Zhiyuan; Lü, Yi

doi:10.1016/j.ijleo.2019.162982

Cited by 13 publications

(6 citation statements)

References 14 publications

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“…This might originate from the reduced hole density of Co in the In 2 O 3 /Co 3 O 4 heterostructure due to the strong coupling between Co 3 O 4 and In 2 O 3 . At the same time, according to the results of UV–vis spectroscopy (Figure S6a) and Kubelka–Munk formula, the band gap of the system gradually increases with the increase in the In 2 O 3 content (Figure S6b). This also proves the carrier transfer between Co 3 O 4 and In 2 O 3 , and then, the built-in electric field is formed at the contact interface of the two semiconductors, which will make the resistance change of In 2 O 3 /Co 3 O 4 NSs in the gas sensing process more obvious in the gas sensing process.…”

Section: Resultsmentioning

confidence: 92%

Co₃O₄ Nanosheets Decorated with In₂O₃ Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Chen

Sun

et al. 2022

ACS Appl. Nano Mater.

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To selectively detect trace carbon monoxide (CO typically lower than 100 ppb) at low temperature is still a great challenge for chemiresistive gas sensors. In this work, we introduce In 2 O 3 nanocubes with exposed {001} facets to couple with MOFderived porous Co 3 O 4 nanosheets (NSs) forming p−n heterojunction for trace CO detection. Benefiting from the vacancy storing effect of the sub-valent band on In 2 O 3 nanocube {001} facets and the p−n heterojunction effect, the electron−hole recombination is effectively inhibited, and the carrier lifetime is prolonged. As a result, the prepared CoIn0.1-based gas sensor shows a good selectivity and ultralow detection limitation of 25 ppb toward CO at relatively low temperature of 175 °C. In addition, the CoIn0.1-based CO sensor also exhibits high response (272.89%) and ultrafast response/ recovery time (2 s/13 s) to 100 ppm CO, which can be ascribed to the fast gas diffusion in the porous Co 3 O 4 NSs and the highindex facet effect of In 2 O 3 nanocubes. This work provides a method to design and synthesize trace CO gas sensors via modulating the band structure of p−n heterojunctions constructed by two-dimensional metal oxide NSs and oxide-exposed high-index facets. KEYWORDS: CO gas sensors, ppb-level, Co 3 O 4 nanosheets, In 2 O 3 nanocubes, heterostructure

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Section: Resultsmentioning

confidence: 92%

Co₃O₄ Nanosheets Decorated with In₂O₃ Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Chen

Sun

et al. 2022

ACS Appl. Nano Mater.

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“…The valence bands (VBs) were studied by XPS spectrum ( Figure 6 a–b), whereas the bandgap ( E g ) values (Figure 6d) were estimated according to the Kubelka–Munk (KM) theory. [ 21 ] Then the VB and CB potentials (eV vs NHE) and bandgap of pristine TiO 2 and Cu 2 O were estimated and is shown in Figure 6e–f with their crystal structures. Considering the band bending and band edge shift phenomenon caused by the formation of dipole at the formed interface, [ 22 ] the more precise band alignment was determined by calculating the values of the VB offset (Δ E VBO ), and the conduction band offset (Δ E CBO ) as well as the energy difference between core level (Δ E CL ) followed as the method proposed by Kraut et al [ 23 ] Figure 6d shows the E g values obtained by extrapolating a linear fit of Tauc plots curve made by ( αhυ ) n versus photon energy ( hυ ), where n equals 0.5 for TiO 2 and 2 for Cu 2 O due to their semiconductor types [17b] .…”

Section: Resultsmentioning

confidence: 99%

Simply Coupling TiO₂ Nanospheres with Cu₂O Particles to Boost the Photocatalytic Hydrogen Evolution through p–n Heterojunction‐Induced Charge Transfer

et al. 2021

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utilizing semiconductors as photocatalysts to convert solar energy into hydrogen energy reasonably becomes a viable, sustainable, and promising approach to generate hydrogen. [3] Among various photocatalysts, TiO 2 is an ideal n-type model of semiconductor photocatalyst and has always attracted increasing attention because it is cheap, stable, nontoxic, and environmentally friendly. [4] Although TiO 2 has good chemical stability and proper energy band level for water splitting, it owns a poor response for the visible light, and the photoinduced charge carriers have a trend of fast recombination during the reactions, which restricts its application in water splitting. [5] Over the past decades, many efforts have been paid on developing effective approaches such as crystal phase engineering, [6] cocatalyst modification, [7] and heterojunction construction [8] to ameliorating the aforementioned issues.Cuprous oxide (Cu 2 O), a p-type semiconductor with a direct bandgap of 2-2.2 eV, [9] is abundant in Earth and relatively simple to be synthesized, which reflects its great potential in photocatalysis application. [10] In particular, Cu 2 O could be served as an excellent candidate for coupling with n-type semiconductor to improve the photoelectric properties and upgrade the catalytic performance in photocatalysis applications ultimately. In recent

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“…In Figure 11a, according to the results of UV-DRS, the band gap (E g ) is calculated according to Kubellka-Munk formula. [52][53][54] The bandgap of TiO 2 -C, TiO 2 -H40, TiO 2 -DEG10, and TiO 2 -DEG20 are 3.04, 2.94, 2.52, and 2.05 eV, respectively. The addition of DEG can significantly narrow the bandgap of TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Cheng

Wang

et al. 2023

Adv Energy and Sustain Res

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TiO2–based photocatalysis system for splitting water into hydrogen offers a sustainable and green technology to produce clean hydrogen energy. However, pristine TiO2 still exists inherent shortcomings restricting its practical applications. Herein, the impact of postprocessing approaches of protonic titanate on engineering of oxygen vacancy and photocatalytic hydrogen evolution of TiO2−x is studied. Subsequently, interfacial cocatalysts are successfully involved in the optimized TiO2−x for enhanced photocatalytic hydrogen evolution. TiO2−x with the highest photocatalytic hydrogen evolution performance of 3112.09 μmol g−1 h−1, denoted as TiO2–C, is selected to adjust the interface with Cu and MoS2 respectively. Cu–TiO2–C and MoS2–TiO2–C composites are synthesized to enhance the separation ability of photogenerated electron‐hole pairs and significantly improve the photocatalytic hydrogen evolution performance. The photocatalytic hydrogen evolution rates of 5 wt% Cu–TiO2–C and 40 wt% MoS2–TiO2–C are 9225.75 and 5765.48 μmol g−1 h−1, respectively. It is proved that different postprocessing methods can tune the content of oxygen vacancy in TiO2−x and regulate the photocatalytic hydrogen evolution performance of TiO2−x materials. The interface regulation of the cocatalyst also contributes to the separation of photogenerated electron‐hole pairs and serves as active sites to enhance hydrogen evolution performance.

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A modified version of BRDF model based on Kubelka-Munk theory for coating materials

Cited by 13 publications

References 14 publications

Co₃O₄ Nanosheets Decorated with In₂O₃ Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Co₃O₄ Nanosheets Decorated with In₂O₃ Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Simply Coupling TiO₂ Nanospheres with Cu₂O Particles to Boost the Photocatalytic Hydrogen Evolution through p–n Heterojunction‐Induced Charge Transfer

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

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A modified version of BRDF model based on Kubelka-Munk theory for coating materials

Cited by 13 publications

References 14 publications

Co3O4 Nanosheets Decorated with In2O3 Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Co3O4 Nanosheets Decorated with In2O3 Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Simply Coupling TiO2 Nanospheres with Cu2O Particles to Boost the Photocatalytic Hydrogen Evolution through p–n Heterojunction‐Induced Charge Transfer

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO2 Nanostructures

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Co₃O₄ Nanosheets Decorated with In₂O₃ Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Co₃O₄ Nanosheets Decorated with In₂O₃ Nanocubes with Exposed {001} Facets for ppb-Level CO Sensing

Simply Coupling TiO₂ Nanospheres with Cu₂O Particles to Boost the Photocatalytic Hydrogen Evolution through p–n Heterojunction‐Induced Charge Transfer

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures