Influence of surface morphology on the optical property of vertically aligned ZnO nanorods

Das, Sachindranath; Kar, Jyoti Prakash; Choi, Jung Chan; Byeon, Seongjae; Jho, Young‐Dahl; Myoung, Jae Min

doi:10.1063/1.3231615

Cited by 18 publications

(6 citation statements)

References 13 publications

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“…1 is the broad shoulder, A, at 3.405 eV. This particular feature in the PL spectrum of ZnO nanorods has appeared in the data of other works without, however, to be commented upon [14,15]. As can be seen in Fig.…”

Section: Methodssupporting

confidence: 55%

Zinc related defects in ZnO nanorods

Travlos

Boukos

Chandrinou

2011

Physica Status Solidi (b)

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Section: Methodssupporting

confidence: 55%

Zinc related defects in ZnO nanorods

Travlos

Boukos

Chandrinou

2011

Physica Status Solidi (b)

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“…This is specifically about the availability of surface states and appropriate data about the capability of NPs to trap charges. To correlate PL and mitigation of recombination in photoactive materials, reported in literature is that decreased intensity shows less recombination of photogenerated charge carriers 38 . Thus, there would be inhibited recombination in 3-2 Bi:Ti, followed by 2–3 and 1–1 Bi:Ti shown by Fig.…”

Section: Resultsmentioning

confidence: 99%

A composite of platelet-like orientated BiVO4 fused with MIL-125(Ti): Synthesis and characterization

Hlophe

Mahlalela

Dlamini

2019

Sci Rep

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The development of heterojunctions is the current focus of the scientific community as these materials are visible light active and the staggered positioning of their band edges combats electron-hole recombination which is the downside of most photocatalysts. In this work, a two- step hydrothermal synthesis protocol was utilized to fabricate a novel observable-light active material, composed of platelet-like BiVO 4 and a titanium-based metal organic framework (MOF) called MIL-125(Ti). The tuning of specific morphologies, such as platelet-like in BiVO 4 , provides the exposure of most reactive facets which are more reactive towards photooxidation of organics in water, thus increasing their efficiency. The as-synthesized heterojunction was characterized by Transmission electron microscopy (TEM), scanning transmission microscopy (SEM), X-Ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS), X-Ray photoelectron spectroscopy (XPS) and photoluminescence (PL) spectra. The formation of the heterojunction lead to a positive shift of the 3-2 Bi:Ti valence band (VB) (1.78 eV) when compared to 1.27 eV VB position of BiVO 4 . The PL and photoelectrochemical measurements revealed that the heterojunction photocatalyst designated 3-2 Bi-Ti demonstrated inhibited recombination rate (platelet-like BiVO 4 > 3-2 Bi:Ti (PM) > MIL-125 > 1–1 Bi:Ti > 2–3 Bi:Ti > 3-2 Bi:Ti) and highly efficient interfacial charge shuttle between platelet-like BiVO 4 and MIL-125(Ti) through the formed n - n junction.

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“…These include assessing the recombination of photogenerated electron and hole rate of the NPs, specifically the presence of surface states and relevant data about their ability to trap charges. Moreover, the correlation between PL intensity and photocatalytic efficiency of NPs has been reported, where lower intensity means less recombination of photogenerated electrons and holes (Das et al 2009). Thus, it can be ascertained that the recombination was least for 0.5NaCl-BiVO 4 and the highest for p-BiVO 4 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of platelet-like BiVO4 using hyperbranched polyethyleneimine for the formation of heterojunctions with Bi2O3

et al. 2019

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Surface structures of nanoparticles (NPs) designed at the atomic level are vital to enhance the catalytic performance and stability of NPs. In this work, we report the engineering of plate-like and platelet-like BiVO 4 NPs for the formation of heterojunctions with Bi 2 O 3 . The morphology and size of NPs were observed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Raman spectroscopy, SAED and powder X-ray diffraction (XRD) were carried out to show the structural composition and they confirmed monoclinic phases for both BiVO 4 and Bi 2 O 3 . BiVO 4 NPs notoriously have low surface area and pore volume, thus HPEI was incorporated to improve these properties. Brunuer-Emmett-Teller (BET) technique was used to characterize the surface area (S BET ) of the photocatalysts and S BET was increased by 88% after the addition of 0.15 mM HPEI during synthesis. Diffuse reflectance spectroscopy was used to elucidate the optical properties of NPs and a blueshift in the heterojunctions was observed due to the incorporation of Bi 2 O 3 . Tuning of {010} monoclinic BiVO 4 was achieved after the addition of 0.5 M NaCl which resulted in plate-like morphologies showing improved optical and electronic properties. Uniform platelet-like BiVO 4 NPs were synthesized successfully after the addition of 0.15 mM HPEI, and this also induced impaired dispersion and size reduction. The calculated band positions of BiVO 4 and Bi 2 O 3 in the heterojunctions were well positioned for carrier charge separation, which was confirmed by the flat band potentials that were 0.553, − 0.47, − 0.70 and − 0.77 V for Bi 2 O 3 , p-BiVO 4 , 0.15HPEI-0.5NaCl-BiVO 4 -Bi 2 O 3 and 0.5NaCl-BiVO 4 .

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Influence of surface morphology on the optical property of vertically aligned ZnO nanorods

Cited by 18 publications

References 13 publications

Zinc related defects in ZnO nanorods

Zinc related defects in ZnO nanorods

A composite of platelet-like orientated BiVO4 fused with MIL-125(Ti): Synthesis and characterization

Synthesis of platelet-like BiVO4 using hyperbranched polyethyleneimine for the formation of heterojunctions with Bi2O3

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