The role of Al doping on ZnO nanowire evolution and optical band gap tuning

Shah, Attaullah; Ahmad, Md. Parvez; Rahmanuddin,; Khan, Sardar; Aziz, Uzma; Ali, Zahid; Khan, Afzal; Mahmood, Asif

doi:10.1007/s00339-019-3005-y

Cited by 31 publications

(15 citation statements)

References 23 publications

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“…The metal absorption is because the free electrons are excited from the conduction band (CB) to a higher Fermi level (EF) because of the phenomenon of surface plasmonic resonance (SPR) according to Au nanostructures [ 70 ]. The same behavior was observed for Al/ZnO, Ag/ZnO, and Pt/ZnO [ 74 , 75 , 76 ].…”

Section: Resultssupporting

confidence: 71%

“…The metal absorption is because the free electrons are excited from the conduction band (CB) to a higher Fermi level (EF) because of the phenomenon of surface plasmonic resonance (SPR) according to Au nanostructures [70]. The same behavior was observed for Al/ZnO, Ag/ZnO, and Pt/ZnO [74][75][76]. Using the Tauc equation, the Eg values decrease from 3.19 to 2.07 eV as Au time coating increased from 0 to 4 min, as shown in Figure 5b.…”

Section: Effect Of Coating Au Thicknessmentioning

confidence: 87%

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Effect of Morphology and Plasmonic on Au/ZnO Films for Efficient Photoelectrochemical Water Splitting

et al. 2021

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To improve photoelectrochemical (PEC) water splitting, various ZnO nanostructures (nanorods (NRs), nanodiscs (NDs), NRs/NDs, and ZnO NRs decorated with gold nanoparticles) have been manufactured. The pure ZnO nanostructures have been synthesized using the successive ionic-layer adsorption and reaction (SILAR) combined with the chemical bath deposition (CBD) process at various deposition times. The structural, chemical composition, nanomorphological, and optical characteristics have been examined by various techniques. The SEM analysis shows that by varying the deposition time of CBD from 2 to 12 h, the morphology of ZnO nanostructures changed from NRs to NDs. All samples exhibit hexagonal phase wurtzite ZnO with polycrystalline nature and preferred orientation alongside (002). The crystallite size along (002) decreased from approximately 79 to 77 nm as deposition time increased from 2 to 12 h. The bandgap of ZnO NRs was tuned from 3.19 to 2.07 eV after optimizing the DC sputtering time of gold to 4 min. Via regulated time-dependent ZnO growth and Au sputtering time, the PEC performance of the nanostructures was optimized. Among the studied ZnO nanostructures, the highest photocurrent density (Jph) was obtained for the 2 h ZnO NRs. As compared with ZnO NRs, the Jph (7.7 mA/cm2) of 4 min Au/ZnO NRs is around 50 times greater. The maximum values of both IPCE and ABPE are 14.2% and 2.05% at 490 nm, which is closed to surface plasmon absorption for Au NPs. There are several essential approaches to improve PEC efficiency by including Au NPs into ZnO NRs, including increasing visible light absorption and minority carrier absorption, boosting photochemical stability, and accelerating electron transport from ZnO NRs to electrolyte carriers.

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Section: Resultssupporting

confidence: 71%

“…The metal absorption is because the free electrons are excited from the conduction band (CB) to a higher Fermi level (EF) because of the phenomenon of surface plasmonic resonance (SPR) according to Au nanostructures [70]. The same behavior was observed for Al/ZnO, Ag/ZnO, and Pt/ZnO [74][75][76]. Using the Tauc equation, the Eg values decrease from 3.19 to 2.07 eV as Au time coating increased from 0 to 4 min, as shown in Figure 5b.…”

Section: Effect Of Coating Au Thicknessmentioning

confidence: 87%

Effect of Morphology and Plasmonic on Au/ZnO Films for Efficient Photoelectrochemical Water Splitting

et al. 2021

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“…A 1 and E 1 represent polar phonon mode, and each of them splits into two branches transverse optical (TO) and longitudinal optical (LO); they were also infrared active. A dominant sharp peak appeared at 437 cm -1 which was a characteristic peak that corresponds to the hexagonal wurtzite phase of ZnO represented by E 2 (high frequency) mode [32]. With the introduction of Sn ion, there was a peak shift with reduction in intensity which might be due to the weakening of ZnO wurtzite structure shown in Fig.…”

Section: Raman Spectroscopymentioning

confidence: 93%

Enhanced catalytic property of metal oxide for an efficient visible-induced photoelectrochemical water splitting

Banerjee

Padhan

Thangavel

2021

J Mater Sci: Mater Electron

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Sn-doped ZnO nanorods (NRs) were grown on a conductive iodine-doped tin oxide substrate with a cost-effective two-step method (sol-gel and hydrothermal). The effect of varying concentration of dopants on morphology and photocurrent density is closely investigated. For microstructural and optical analysis, the bare and Sn-doped ZnO NRs were subjected to field emission scanning electron microscope (FESEM), energy-dispersive spectroscopy, X-ray diffraction, UV-Vis, and Raman spectroscopy. The presence of the most intense peak directed to (0002) plane confirmed the growth of ZnO NRs and their vertical alignment towards c-axis. The impact on nucleation density and morphology due to the addition of dopant was revealed by the FESEM images. The Raman analysis also confirmed the wurtzite nature of ZnO NRs along with the impact of dopant in its crystallinity. The aim of this work was to ameliorate the capability of absorbing solar light in the visible range. Sn 0.05 Zn 0.95 O exhibited highest photocurrent density among all the doped samples with 0.199% photoconversion efficiency under visible-light illumination. Therefore, the synthesised Sn 0.05 Zn 0.95 O seems to be an efficient candidate for photoelectrochemical water-splitting application.

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“…Furthermore, the lifetime measurements are carried out with time resolved photoluminescence (TRPL) spectra recorded with FLS 1000, Edinburg Instruments. The detailed photo evaluation studies including apparent quantum efficiency (AQE) calculations 29 and band gap energy (E g ) 30 along with the electron kinetics studies are included in the Supporting Information.…”

Section: Characterization Techniquesmentioning

confidence: 99%

Tuning and Sustainment of High Surface Area of Nano CeO₂-Anchored NiMOF Flake Heterojunctions for Efficient Photocatalytic Hydrogen Generation

Meera,

Hossain,

Shafna

et al. 2023

Energy Fuels

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The approach for promoting the tunable photochemical properties of NiMOF for catalytic applications has been recognized as a smart choice for solar water splitting. However, the major concern is the low specific surface area (SSA). The present approach has specifically resolved this problem by tuning the nature of the surface of NiMOF by anchoring with ultranano-sized CeO 2 . The CeO 2 (111) plane has a strong electron migrating affinity, and hence, the heterojunction significantly facilitates and directs the photoinduced electrons toward the reaction centers. In addition, the existence of NiMOF with switchable valence states as catalytic centers in the heterojunction also efficiently catalyzes the proton reduction. The enhancement in SSA of NiMOF and the surface tuning with ultranano-sized CeO 2 are the key reasons for the observed higher activity (2.14 mmol/g/h) of the 0.2:1-CeO 2 @ NiMOF hybrid composite with a high AQE value (18.82% at 320 nm). The results obtained are compared and found to be highly competitive with respect to high standard recent reports.

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The role of Al doping on ZnO nanowire evolution and optical band gap tuning

Cited by 31 publications

References 23 publications

Effect of Morphology and Plasmonic on Au/ZnO Films for Efficient Photoelectrochemical Water Splitting

Effect of Morphology and Plasmonic on Au/ZnO Films for Efficient Photoelectrochemical Water Splitting

Enhanced catalytic property of metal oxide for an efficient visible-induced photoelectrochemical water splitting

Tuning and Sustainment of High Surface Area of Nano CeO₂-Anchored NiMOF Flake Heterojunctions for Efficient Photocatalytic Hydrogen Generation

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The role of Al doping on ZnO nanowire evolution and optical band gap tuning

Cited by 31 publications

References 23 publications

Effect of Morphology and Plasmonic on Au/ZnO Films for Efficient Photoelectrochemical Water Splitting

Effect of Morphology and Plasmonic on Au/ZnO Films for Efficient Photoelectrochemical Water Splitting

Enhanced catalytic property of metal oxide for an efficient visible-induced photoelectrochemical water splitting

Tuning and Sustainment of High Surface Area of Nano CeO2-Anchored NiMOF Flake Heterojunctions for Efficient Photocatalytic Hydrogen Generation

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Product

Resources

About

Tuning and Sustainment of High Surface Area of Nano CeO₂-Anchored NiMOF Flake Heterojunctions for Efficient Photocatalytic Hydrogen Generation