Ultrafine Cu2ZnSnS4 quantum dots functionalized TiO2 nanotube arrays for potential optoelectronic applications

Yang, Zuobao; Zhu, Zhaowu; Pan, Xuenan; Ma, Zhongquan; Zhang, Xiaohong

doi:10.1016/j.ceramint.2019.09.290

Cited by 8 publications

(5 citation statements)

References 56 publications

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“…Furthermore, the selected area electron diffraction (SAED) image, which was recorded from the dotted circle area of Figure 3 a, shows that the synthesized CZTS NPs exhibit polycrystalline properties, featuring distinctive rings corresponding to CZTS (112)/(220) planes, consistent with XRD results. In addition, the lattice fringe and IFFT image of CZTS, as shown in Figure 3 b, clearly indicate a lattice spacing of 0.319 nm related to the CZTS (112) crystal plane, which is in good agreement with the literature [ 14 , 18 , 32 , 33 ].…”

Section: Resultssupporting

confidence: 89%

“…These peaks indicate the presence of Cu 2+ valence states in the sample due to an increase in copper content, which may lead to adjustments in the electronic structure of the material, thereby affecting its photocatalytic performance. Specifically, the presence of Cu 2+ may alter the material’s light absorption characteristics, electron transfer performance, and distribution of surface active sites, thereby affecting the rate and efficiency of photocatalytic reactions [ 14 , 32 , 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

“…In CZTS, two strong peaks are located around 1045.0 eV (Zn 2p 1/2 ) and 1021.8 eV (Zn 2p 3/2 ), separated by 23.2 eV. In CZTS–A 5 , the intense peak is concentrated at 1045.3 eV (Zn 2p 1/2 ) and 1022.1 eV (Zn 2p 3/2 ), maintaining the same splitting value of 23.2 eV, indicating the presence of the Zn 2+ oxidation state [ 32 , 33 , 35 ]. The appearance of Zn 2+ may be related to the conductivity and light absorption characteristics of the material.…”

Section: Resultsmentioning

confidence: 99%

“…This range is consistent with the reported binding energy of sulfur in sulfides, indicating the oxidation state of sulfides. The binding energy shift of the S 2p peak in CZTS is lower, indicating the electron enrichment of sulfur, suggesting the presence of sulfur vacancies [ 32 , 36 , 37 ]. These phenomena may affect the surface chemical reactions and photo-generated charge separation processes of materials, affecting their photocatalytic performance.…”

Section: Resultsmentioning

confidence: 99%

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A Convenient In Situ Preparation of Cu2ZnSnS4–Anatase Hybrid Nanocomposite for Photocatalysis/Photoelectrochemical Water-Splitting Hydrogen Production

Li,

Shi

et al. 2024

Molecules

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This study details the rational design and synthesis of Cu2ZnSnS4 (CZTS)-doped anatase (A) heterostructures, utilizing earth-abundant elements to enhance the efficiency of solar-driven water splitting. A one-step hydrothermal method was employed to fabricate a series of CZTS–A heterojunctions. As the concentration of titanium dioxide (TiO2) varied, the morphology of CZTS shifted from floral patterns to sheet-like structures. The resulting CZTS–A heterostructures underwent comprehensive characterization through photoelectrochemical response assessments, optical measurements, and electrochemical impedance spectroscopy analyses. Detailed photoelectrochemical (PEC) investigations demonstrated notable enhancements in photocurrent density and incident photon-to-electron conversion efficiency (IPCE). Compared to pure anatase electrodes, the optimized CZTS–A heterostructures exhibited a seven-fold increase in photocurrent density and reached a hydrogen production efficiency of 1.1%. Additionally, the maximum H2 production rate from these heterostructures was 11-times greater than that of pure anatase and 250-times higher than the original CZTS after 2 h of irradiation. These results underscore the enhanced PEC performance of CZTS–A heterostructures, highlighting their potential as highly efficient materials for solar water splitting. Integrating Cu2ZnSnS4 nanoparticles (NPs) within TiO2 (anatase) heterostructures implied new avenues for developing earth-abundant and cost-effective photocatalytic systems for renewable energy applications.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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A Convenient In Situ Preparation of Cu2ZnSnS4–Anatase Hybrid Nanocomposite for Photocatalysis/Photoelectrochemical Water-Splitting Hydrogen Production

Li,

Shi

et al. 2024

Molecules

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“…As a result, finding a suitable host can be a challenge. Numerous semiconducting materials such as SnO 2 , ZnO, AWO 4 (A= Ca, Ba, Sr), TiO 2 , and MoS 2 have been used as hosts for the rare-earth ions. ,− Among them, TiO 2 has received attention due to its excellent photostability, nontoxicity, environmentally friendly nature, and inexpensive manufacturing cost. − The optimal doping concentrations of Nd(III) and Er(III) trivalent ions can effectively induce advantageous structural, spectroscopic transformations in the titania Ti(IV). Herein, we propose a broad, tunable NIR PL emission by Er/Nd-doped TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Tunable Broadband NIR PL Emissions with (Nd³⁺/Er³⁺) Codoped TiO₂ via Synergetic Energy Transfer

Katta

Biswas

Raavi

2022

ACS Appl. Opt. Mater.

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Tunable photoluminescence (PL) emissions in the near-infrared (NIR) region are the most advantageous qualities that benefit NIR light-dependent applications such as thermosensing, biosensing, solar cells, LED, bioimaging technologies, etc. Rare-earth trivalent (+3) doping is essential for the NIR light sources due to their unique transitions. Especially, multi-rare-earth doping is being highlighted for the effect of generating broad-band emissions. This work presents a concept of tunable NIR PL emission via codoping of (Er/Nd) into TiO2 at varied excitation wavelengths and stoichiometry ratios. We discovered the synergetic energy transfer (ET) mechanism among the Er3+ and Nd3+ energy states, which led to tuning the PL emissions over the NIR region to the mid-IR region. A broad-band PL emission from 850 to 1700 nm at an indirect excitation wavelength of 360 nm confirms the energy transfer (ET) occurring from TiO2 (host) to the lanthanide of Er3+ and Nd3+ (guests). In addition, the direct excitation (visible) excitation-dependent PL emission and their associated electron decay lifetime suggest the possibility of ET between Er3+ and Nd3+, which is evidenced by high energy transfer efficiency (ETE), whereas the ETE from Er3+ to Nd3+ is calculated to be 46% measured at the high intense PL emission of (1532 nm, Er: 4 F 13 / 2 .25em to .25em I 15 / 2 ) under the excitation of 528 nm. These results are consistent with the enhanced QY values up to 90% for the (Er/Nd) codoped TiO2 compared to the single Er-doped TiO2. Similarly, ETE from Nd to Er is almost 48% attained at the emission of (1068 nm, Nd: 4 F 3 / 2 .25em to .25em 4 I 11 / 2 ) under 588 nm excitation and their changes in the QY values indicate the ET occurrence from Nd3+ to Er3+. Thus, it is hypothesized that the PL investigations support the synergetic ET between Nd3+ and Er3+ is responsible for the tunable PL emissions.

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Formation mechanism of chained and crystallographically oriented pores on n-InP surfaces

Suchikova,

Bohdanov,

Kovachov

et al. 2023

Appl Nanosci

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Ultrafine Cu2ZnSnS4 quantum dots functionalized TiO2 nanotube arrays for potential optoelectronic applications

Cited by 8 publications

References 56 publications

A Convenient In Situ Preparation of Cu2ZnSnS4–Anatase Hybrid Nanocomposite for Photocatalysis/Photoelectrochemical Water-Splitting Hydrogen Production

A Convenient In Situ Preparation of Cu2ZnSnS4–Anatase Hybrid Nanocomposite for Photocatalysis/Photoelectrochemical Water-Splitting Hydrogen Production

Tunable Broadband NIR PL Emissions with (Nd³⁺/Er³⁺) Codoped TiO₂ via Synergetic Energy Transfer

Formation mechanism of chained and crystallographically oriented pores on n-InP surfaces

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Ultrafine Cu2ZnSnS4 quantum dots functionalized TiO2 nanotube arrays for potential optoelectronic applications

Cited by 8 publications

References 56 publications

A Convenient In Situ Preparation of Cu2ZnSnS4–Anatase Hybrid Nanocomposite for Photocatalysis/Photoelectrochemical Water-Splitting Hydrogen Production

A Convenient In Situ Preparation of Cu2ZnSnS4–Anatase Hybrid Nanocomposite for Photocatalysis/Photoelectrochemical Water-Splitting Hydrogen Production

Tunable Broadband NIR PL Emissions with (Nd3+/Er3+) Codoped TiO2 via Synergetic Energy Transfer

Formation mechanism of chained and crystallographically oriented pores on n-InP surfaces

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Tunable Broadband NIR PL Emissions with (Nd³⁺/Er³⁺) Codoped TiO₂ via Synergetic Energy Transfer