Advanced Energy Materials
·
2021
·Vol. 11
·期 31
·2101230
·
IF 29.368
Hongyang Zhao,Xin Li,Mengke Cai,Cheng Liu,Yimin You,Rui Wang,Ali Imran Channa,Feng Lin,Da Huo,Guofeng Xu,Xin Tong,Zhiming M. Wang
As emerging eco-friendly alternatives to traditional Cd/Pb-based quantum dots (QDs), InP/ZnSe(S) core/shell QDs have demonstrated huge potential in light-emitting technologies. So far, these QDs have been rarely employed in solar energy conversion applications due to their type-I band structure offering limited photo-induced charge carrier separation and transfer. Here, a controllable Cu shell doping approach is reported to engineer the optoelectronic properties of InP/ZnSe core/shell QDs and realize high performance and stable solar-driven photoelectrochemical (PEC) hydrogen evolution. As compared to the pristine InP/ZnSe QDs, the Cu-doped core/shell QDs exhibit enhances the photo-induced electron transfer rate due to the capture of photo-generated holes via Cu impurity states in the shell, leading to improved photocurrent density and long-term durability in as-fabricated InP/ZnSe:Cu QDs-PEC devices under standard one sun illumination. The results indicate that the doping of Cu in the shell has a preeminent effect on the optoelectronic properties of the core/shell QDs and may open up new avenues to tailor eco-friendly core/shell QDs for high performance and stable solar energy conversion.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2024
·
IF 4.6
Aygul Kadir,Tursun Abdiryim,Xiong Liu,Fangfei Liu,Ruxangul Jamal,Xinsheng Tang,Yaolong Zhang
In the present work, a novel self-powered hybrid ultraviolet (UV) photodetector (PD) based on ZnO @ZnSe nanoarrays/poly(3,4-ethylenedioxyselenophene) (PEDOS) was fabricated and systematically investigated. The designed PD is based on a sandwich configuration and with p-n junction, which is consisting of ZnO as the bottom n- layer, PEDOS as the top of p-layer, and ZnSe as the insertion layer. The results of the study on the performances of UV PD under different conditions optical power density shows that the ZnO@ZnSe/PEDOS exhibits excellent detection of UV light, the device achieves the excellent responsivity (R) 5.44 mA/W and high detectivity (D*) 1.42 × 10 11 Jones under the weaker optical power density (0.32 mW/cm 2 ). The study concludes with a suggestion that the ZnSe layer acts a key role in the superior property of the obtained device, which is introduction of ZnSe layer between the p-PEDOS and n-ZnO layers reduces band migration and thus effectively enhances carrier transport within them, and demonstrating that the responsivity (R) of ZnO@ZnSe/PEDOS is almost 18 times that of the device without the ZnSe layer (0.3 mA/W). On the other hand, as the p- types PEDOS, which enhances the junction quality by reducing the composite center of the carrier, expanding the depletion region and providing a step energy level between the band edges of ZnO and ZnSe, improving the overall collection of photogenerated carriers.
研究领域:
材料科学
·
光电子学
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Dong Li,Xiaoxiao He,Litao Zhao,Haoyang Li,Yu Zhao,Sanjun Zhang,Xiaolei Zhang,Jinquan Chen,Qingyuan Jin,Jianhua Xu
In this article, by connecting positively charged cysteamine-coated ZnSe quantum dots (QDs) with either negatively charged graphene oxide (GO) or reduced graphene oxide (RGO), we have assembled ZnSe-GO and ZnSe-RGO composite materials, respectively. We used time-correlated single photon counting (TCSPC) and femtosecond transient absorption (TA) to study the effects of GO/RGO on the fluorescence and carrier transport dynamics of ZnSe QDs. We confirmed that the strong excited state interaction between GO/RGO and ZnSe QDs could significantly quench the exciton fluorescence of ZnSe QDs. Picosecond ultrafast electron transfer from ZnSe QDs to GO/RGO surfaces has been found, and it can decrease the bleaching signal intensity of ZnSe QDs and accelerate the recovery of the bleaching signal as well. Moreover, we found that the energy level change caused by the GO reduction reduced the energy level difference between RGO and ZnSe QDs, which implies broader application prospects for ZnSe-RGO vs. ZnSe-GO composite.
研究领域:
材料科学
·
光物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Science-Advanced Materials and Devices
·
2021
·
IF 5.469
Jianping Deng,Wenlei Lv,Pengchao Zhang,Wendeng Huang
Flexible photodetectors show great applications in wearable electronics such as health monitoring and the Internet of Things. In this study, we have prepared ultralong ZnSe–PbSe heterojunction nanowires with a length of 20 μm in gram-scale by an in-situ cation exchange reaction. The produced PbSe nanoparticles on the ZnSe nanowire configuration are close to an ideal heterojunction system due to the small lattice mismatch of 7.4% in the (111) direction. The Ohmic contact is formed for nanowire photodetectors. The ZnSe–PbSe heterojunction nanowire photodetector exhibits a broadband photoresponse with the peak responsivity of 40 A W −1 while the ZnSe nanowire photodetector shows a narrowband photoresponse of 5 A W −1 , as a result of its extended absorption across the entire UV-visible-NIR. Electrons are transported from PbSe to ZnSe while holes are trapped at PbSe, and electrons are extracted to an external circuit by an Al electrode, resulting in a high gain of the photoconductor. The broadband photoresponse, the large linear dynamic range of 66 dB, the fast response speed of 0.02 s and the protracted cycle of 5000 show the feasibility of the flexible heterojunction photodetector.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-10
·
IF 5.833
Meng Yuchan,Qin Nana,Hun Xu
ZnSe nanodisks:Ti 3 C 2 MXene complex was prepared for the first time. Based on its remarkable photoelectrochemical performance, combined with the enzyme-free toehold-mediated strand displacement reaction, a photoelectrochemical biosensor for the detection of the non-small-cell cancer biomarker ctDNA KRAS G12D was developed. ZnSe nanodisks were in situ grown on Ti 3 C 2 MXene surface by two-step hydrothermal method. The high conductivity and adjustable band gap of MXene significantly enhanced the photoelectric response of ZnSe. Subsequently, the photoelectrochemical biosensor was prepared by combining with the signal amplification function of p- aminophenol and the enzyme-free toehold-mediated strand displacement reaction on the modified ITO electrode surface. Under the optimized conditions, the linear detection range is 0.5 ~ 100.0 fM, and the detection limit is 0.2 fM, which realizes the sensitive detection of KRAS G12D. The photoelectrochemical biosensor constructed opens up a new pathway for the preparation of new Mxene-based composite materials and the research of photoelectrochemical biosensor. Graphical abstract Nucleic acid liquid biopsy with ZnSe nanodisks:Ti 3 C 2 MXene photoelectroactive modified electrode
研究领域:
材料科学
·
生物医学工程
·
分析化学
·
癌症诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2025
·Vol. 33
·期 11
·22588-22597
·
IF 3.3
Tingting Zhang,Qing Ma,Qingping Li,Lanting Huang,Yuqiong Feng,Hongwei Duan,Xinlei Chen,Qinghua Li,Xiao Jin,Jinke Bai,Jinke Bai,Bing Xu,Bing Xu
Heavy metal-free ZnSe-based core-shell quantum dots (QDs) are promising emitting material for achieving violet-blue luminescence. Investigating the temperature-dependent variations in the photoluminescence (PL) properties of ZnSe-based QDs will enhance our understanding of the intrinsic factors that influence their diverse luminescence characteristics. Here we select the optimally synthesized ZnSe core QDs with three diameters (4.1, 5.2, and 8.3 nm) and ZnSe/ZnS core-shell QDs to study their temperature-dependent photoluminescence properties. As the sample temperature is increased, the PL intensity decreases, the emission energy redshifts, and the spectral become broader. We observe a reduction in the exciton- longitudinal optical (LO)-phonon coupling constant from 21.7 meV to 16.1 meV as the diameter of ZnSe core QDs increased from 4.1 nm to 8.3 nm. This decrease is associated with a narrower homogeneous broadening of the emission spectrum. Besides, the epitaxial growth of a ZnS wide bandgap shells onto the ZnSe core QDs can effectively isolate the photogenerated excitons away from the inorganic-organic interface, thus reducing the PL peak width and increasing the exciton binding energy of the QDs. Our research provides a valuable addition to the existing studies on the photoluminescence properties of ZnSe-based core-shell QDs.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 36
·5274-5280
·
IF 1.9
Yurong Tang,Shuguang Yan,Hang Ye,Fenglan Zheng,Liu Feng,Feng Liu,Xulong Li
The design of quantum dots as a new sensing platform is very important for developing high-sensitivity fluorescent sensors. However, achieving a new strategy is still a great challenge. Here, a new strategy for fabricating water-dispersible thiol malic acid modified ZnSe quantum dots (TMA-ZnSe QDs) is presented in aqueous solution. The characteristics of the modified TMA-ZnSe QDs and the interactions between TMA-ZnSe QDs, Al3+ and rutin were investigated by atomic force microscopy, energy dispersive X-ray spectroscopy, fluorescence spectrometry, resonance Rayleigh scattering, UV-vis absorption spectroscopy and Fourier transform infrared spectroscopy. A new high-sensitivity fluorescent sensor based on tuning the aggregation/disaggregation behavior of TMA-ZnSe QDs by structure-switching for the detection of rutin was developed. The results confirmed that the detection sensitivity was greatly improved by the aggregation of TMA-ZnSe QDs with Al3+ because rutin effectively quenched the FL of TMA-ZnSe QDs–Al3+via the photoinduced electron transfer process. Under optimum conditions, the decrease in the FL intensity was linear to the rutin concentration from 0.02 μg mL−1 to 9 μg mL−1 and the detection limit for rutin was 0.02 μg mL−1. The proposed method offered a new possibility for rutin detection in real samples owing to its low cost, simplicity, high sensitivity and good stability. The present work provides a new strategy for improving sensitivity by tuning the aggregation/disaggregation behavior of TMA-ZnSe QDs.
研究领域:
分析化学
·
纳米生物技术
·
分子诊断
·
药物分析
·
荧光传感
✓ 已验证
DOI
高影响因子
Batteries-Basel
·
2024
·Vol. 10
·期 12
·447
·
IF 4.6
Haoliang Xie,Shunxing Chen,Lianghao Yu,Guang Chen,Huile Jin,Jun Li,Shun Wang,Jichang Wang
The development of high energy and power density sodium-ion batteries (SIBs) has attracted increasing interest in the last two decades due to the abundance and cost-effectiveness of sodium resources. Herein, this study developed a self-templating synthetic method to construct MoSe2nanosheets which were intercalated by ZnSe nanoparticles and were anchored on the in situ reduced graphene oxide layers. The thus-fabricated composites exhibited excellent Coulombic efficiency, a remarkable rate capability and an exceptionally long cycle life when being utilized as the anode in SIBs. Specifically, a reversible capacity of 265 mAh g−1was achieved at 20 A g−1, which could be maintained for 6400 cycles. At an ultra-high rate of 30.0 A g−1, the anode retained a capacity of 235 mAh g−1after 9500 cycles. Such a strong performance was attributed to its unique porous structure and synergistic interactions of multi-components. The underlying sodium storage mechanism was further investigated through various techniques such as in situ X-ray diffraction spectroscopy, the galvanostatic intermittent titration method, etc. Overall, this study illustrates the great potential of clad-structured multicomponent hybrids in developing high-performance SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2015
·Vol. 25
·期 17
·2543-2551
·
IF 11.805
Wenjin Yang,Baodan Liu,Bing Yang,Jianyu Wang,Takashi Sekiguchi,Staedler Thorsten,Xin Jiang
Bandgap engineering of semiconductor nanostructures is of significant importance either for the optical property tailoring or for the integration of functional optoelectronic devices. Here, an efficient way to control the bandgap and emission wavelength is reported for a binary compound semiconductor through alloying with another binary compound. Taking GaP-ZnSe system as an example, the bandgap of quaternary GaP-ZnSe solid-solution nanowires can be selectively tailored in the range of 1.95–2.2 eV by controlling the solubility of ZnSe dopants in GaP host. High-resolution transmission electron microscopy measurement and chemical analyses using an X-ray energy dispersive spectrometer (EDS) demonstrate the solid-solution feature of GaP-ZnSe semiconductor alloy, while X-ray photoelectron spectroscopy (XPS) characterization verifies the formation of some new chemical bonds corresponding to Zn-P and Ga-S bonds in GaP-ZnSe nanowires. The strategy to tailor the optoelectronic property of semiconductor nanostructures through the solid-solution of two different binary compounds represents a general routine to the property modification of all pseudobinary systems and will open more opportunity for their applications in electronics, optics and optoelectronics.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2010
·
IF 4.224
Lai-Jun Zhang,Xing-Can Shen,Hong Liang,Jia-Ting Yao
Four families of magic-sized ZnSe quantum dots (ZnSe MSQDs) with the first exciton absorption peaks at 280 nm (F280), 291 nm (F291), about 319 nm (F319), and 347 nm (F347) were synthesized using fatty amine−H2Se complex as selenium precursor via noninjection one-pot or hot-injection approaches. The formation, growth, and transformation of these families of ZnSe MSQDs were monitored mainly by ultraviolet−visible absorption spectroscopy. Relatively pure F291 and F347 were obtained via the combination of hot-injection technology with purification treatment and were further characterized using mass spectroscopy, infrared spectroscopy, fluorescence spectroscopy, transmission electron microscopy, and X-ray powder diffraction. F291 and F347 are speculated to be [(Zn7Se7)(OLA)2(OA)] (OLA = oleylamine, OA = octylamine) and [(Zn16Se15)(OLA)7], respectively, by analyzing the corresponding mass and the infrared and absorption spectra; both emit narrow exciton fluorescence with relatively small stokes shift of 9 and 2 nm, respectively. Ultrafine ZnSe nanorods with a diameter of about 1.7 nm formed via oriented attachment of F347 were observed using transmission electron microscopy. Fatty amine−H2Se complex has been demonstrated to be a simple, phosphine-free, low-cost, and effective selenium precursor for the synthesis of ZnSe MSQDs or regular quantum dots (RQDs).
研究领域:
材料科学
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2023
·
IF 15
Jiakuan Zhang,Jiongzhao Li,Zikang Ye,Jiting Cui,Xiaogang Peng
Using CdSe/ZnSe core–shell quantum dots (QDs) as a model, we systematically investigate the photochemical properties of QDs with the ZnSe shells under an ambient environment, which show almost opposite responses to either oxygen or water in comparison with CdSe/CdS core/shell QDs. While the ZnSe shells provide an efficient potential barrier for photoinduced electron transfer from the core to the surface-adsorbed oxygen, they also act as a stepping stone for hot-electron transfer directly from the ZnSe shells to oxygen. The latter process is so effective and competes favorably with ultrafast relaxation of hot electrons from the ZnSe shells to the core QDs, which can completely quench the photoluminescence (PL) with saturated adsorption of oxygen (1 bar) and initiate oxidation of the surface anion sites. Water can slowly eliminate the excess hole to neutralize the positively charged QDs, partially canceling the photochemical effects of oxygen. Alkylphosphines─through two distinctive reaction pathways with oxygen─stop the photochemical effects of oxygen and completely recover PL. With limited thickness (around two monolayers), the ZnS outer shells substantially slow down photochemical effects on CdSe/ZnSe/ZnS core/shell/shell QDs but cannot fully stop PL quenching by oxygen.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 6
·2702-2714
·
IF 6.482
Arnauld Robert Tapa,Wanchun Xiang,Abdelaal. S. A. Ahmed,Senwei Wu,Bin Li,Qiufen Liu,Chawuch Machar Jacob Chuti,Xiujian Zhao
In this work, we employ a simple hydrothermal method to synthesize a metal–organic framework (MOF) derived selenide from a reduced graphene oxide (rGO)/structured zeolitic imidazolate framework (ZIF). The resulting MOF-derived selenide (rGO/ZnSe/CoSe2) consists of porous nanowires encapsulated in a carbon matrix and having a high surface area (169.30 m2 g−1). This porous rGO/ZnSe/CoSe2 is combined with polystyrene sulfonate-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) for use as a CE for DSSCs. CEs based on different weight percentages (1, 3, and 5 wt%) of rGO/ZnSe/CoSe2 powder in PEDOT:PSS solution are compared with the commonly used platinum (Pt) based CE. The rGO/ZnSe/CoSe2–PEDOT:PSS composite benefits from the synergistic effects between porous rGO/ZnSe/CoSe2 having a high surface area and PEDOT:PSS which holds superior conductivity and strong binding capability with a fluorine-doped tin oxide (FTO) glass substrate. Therefore, the 3 wt% rGO/ZnSe/CoSe2–PEDOT:PSS composite based CE achieved a good stability and superior electrocatalytic activity compared to Pt CE. Furthermore, DSSCs based on a 3 wt% rGO/ZnSe/CoSe2–PEDOT:PSS composite CE achieved a higher power conversion efficiency (PCE) of 8.60%, compared to the PCE of the Pt CE based DSSC (7.14%) prepared under similar conditions. This work has revealed a new approach to prepare MOF-derived selenide based CEs with high electrocatalytic activity without any calcination. In addition, we demonstrated that the low-cost 3 wt% rGO/ZnSe/CoSe2–PEDOT:PSS composite CE is an excellent candidate to replace Pt CE in DSSCs.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）