JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 131
·期 14
·
IF 2.877
Chen Guifeng,Du Qinghua,Zhang Hui,Niu Ruotong,Yuan Wenhao,Xie Xinjian,Guo Tianyu,Liu Guodong
Quantum dots of I–III–VI ternary compounds exhibit unusual photophysical properties and technological utility, which attract attention and have been intensely investigated. CuInSe 2 quantum dots are an environmentally friendly composition, a direct transition, and an adjustable bandgap. Here, we discuss the influence of the Cu/In molar ratio of CuInSe 2 quantum dots on Cu-related defects and photo-physical properties, and CuInSe 2 quantum dots are synthesized by a green, safe, and low-temperature method in triethylene glycol. The proportion of the +1 and +2 oxidation states of Cu in the quantum dots will change with the Cu/In molar atomic ratio. The +1-oxidation state of Cu will prolong the carrier recombination lifetime and provide favorable conditions for the transfer and collection of carriers. By adjusting for different defect types, we can better apply CISe quantum dots in devices and other fields.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 8
·085101
·
IF 3.551
Yang Sheng,Shuai Li,Yixin Sun,Rong Zhang,Xinyu Zhao,Mei Chee Tan
CuInSe2 quantum dots (QDs) are one of the most important Cd-free fluorescent probes; they usually exhibited low fluorescence intensity, suggesting that a considerable amount of absorbed photon energy was lost as heat. In this study we aimed to improve the fluorescence intensity of CuInSe2 QDs and investigate their photoacoustic (PA) signal resulting from the heat dissipation, which was previously rarely reported. Cu–In–Zn–Se/ZnSe QDs were synthesized by adopting two strategies of Zn doping and ZnSe shell growth. It was found that there was an upper limit for Zn concentration beyond which the fluorescence intensity began to decrease. In addition, a blue shift of the emission peak of Cu–In–Zn–Se/ZnSe QDs was observed at high concentrations of ZnSe precursor due to the diffusion of excessive Zn. To prepare the dual-modal fluorescence and PA imaging probe, poly(maleic anhydride-alt-1-octadecene) (PMAO) modified with polyethylene glycol (PEG) was coated on the QDs, which led to a slight reduction in fluorescence. Cellular labeling on HeLa cells was performed to demonstrate the utility of these probes for fluorescence imaging. We further studied the in vitro PA imaging capabilities of the Cu–In–Zn–Se/ZnSe/PMAO-g-PEG nanoparticles, which showed a distinct PA signal beyond 1.0 mg ml−1. The current work demonstrated that a moderate amount of Zn doping is necessary for enhancing fluorescence and there is a limit beyond which the fluorescence will be diminished. We also demonstrated the proof of concept that Cu–In–Zn–Se/ZnSe QDs are able to serve as a potential PA imaging contrast agent.
研究领域:
材料科学
·
生物医学工程
·
光学成像
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Guohua Mi,Huanxian Shi,Min Yang,Cunjin Wang,Hong Hao,Jun Fan
Doxorubicin hydrochloride (DOX) is an effective anthracycline anticancer drug . However, the exceeded taken up could induce several side-effects such as cardiotoxicity, alopecia. Therefore, the level of DOX needs to be closely monitored to avoid the occurrence of its side-effects. Herein, we report a novel core CuInSe 2 - shell ZnS quantum dots (CuInSe 2 @ZnS, QDs) and Ag nanoparticles (NPs) fluorescence sensor based on the surface plasmon resonance effect (SPR) of Ag NPs. The CuInSe 2 @ZnS QDs were prepared by water phase reflux method with the 3-mercaptopropionic acid (MPA) as stabilizer and ligand. The fluorescence intensity of CuInSe 2 @ZnS QDs/Ag NPs significantly reduced by DOX, which is mainly based on the electrostatic interaction between the DOX and fluorescence sensors. The inhibition of photoluminescence (ln F 0 /F) was linearly relationship to the concentration of DOX in the range of 2–100 μM with the detection limit as low as 0.05 μM. The as-prepared sensor has a high selectivity and sensitivity to DOX. Furthermore, the new sensor has been successfully applied to the determination of DOX in human serum samples with satisfactory results. Our work provides a clue for developing a novel CuInSe 2 @ZnS QDs/Ag NPs based fluorescence sensor for DOX detection.
研究领域:
药物分析
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生物医学工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2023
·Vol. 35
·期 12
·e202300203
·
IF 3
Shufang Ren,Runyan Feng,Tong Guo,Li Cao,Rui Lv,Xiaohang Liu,Qingtao Wang,Zhixiang Zheng
Dopamine (DA) is known as a crucial neurotransmitter synthesized and secreted by dopaminergic neurons and plays a role in regulating human emotions and behaviors. The determination of DA content is of great significance in clinical application and physiological function research. An electroanalytical sensor based on the ternary semiconductor material copper indium selenide (CuInSe 2 ) coated carbon spheres functionalized glassy carbon electrode (CuInSe 2 @CS/GCE) towards the non-invasive determination of DA was constructed in this study. The performances of the sensor were characterized using cyclic voltammetry, impedance method, and differential pulse voltammetry. The results show that wrinkled CuInSe 2 completely coated on CS. The sensor exhibits good electrochemical kinetics and response signal towards DA, which results from the good electrochemical activity and excellent electroconductibility of transition metal centers of the composite. The determination limit of the proposed sensor towards DA is 0.59 μM (S/N=3), and the linear measuring range is between 1–800 μM. In addition, the sensor exhibits desirable long-term robustness, reproducibility, repetitiveness, and interference immunity. In the non-invasive determination towards real samples of human urine and sweat, the sensor provides good recovery rate and small determination deviation.
研究领域:
电化学
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生物传感器
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分析化学
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纳米材料
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神经科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ruiqi Guo,Jie Meng,Weihua Lin,Aqiang Liu,Tönu Pullerits,Kaibo Zheng,Jianjun Tian
CuInSe 2 (CISe) colloidal quantum dots (QDs) display promising applications in photodetection especially within near-infrared (NIR) regions due to their high extinction coefficient and environmental-friendly. However, the high trap density and poor crystal quality introduced by the ternary structure result in low photodetection of CISe QDs devices. Herein, we dope transition metal manganese ions (Mn 2+ ) into CISe QDs to tackle the above problems. Structural characterization results demonstrate the crystal quality of CISe QDs is improved by doping Mn 2+ during the synthesis of QDs. The transient absorption (TA) spectroscopic study together with the space-charge-limited current (SCLC) measurements show the charge carrier lifetime of Mn-CISe QDs is much longer than that of the CISe QDs, due to the Mn 2+ doping state serve as hole capturer forming a charge-compensated pair with the Cu 2+ defect that makes the long-lived Cu 2+ radiative recombination dominate. Furthermore, Mn 2+ doping concurrently modifies the conduction band minimum and valence band maximum level of the QDs verified by the ultraviolet photoelectron spectroscopy (UPS), which determines the driving force for charge carrier transfer to acceptors. The optimal Mn 2+ doping level (0.01 Mn:Cu feed ratio) balanced the above two factors in the QDs. The detector based on such Mn-CISe QDs exhibits responsivity of 30 mA/W and specific detectivity of 4.2 × 10 12 Jones at near-infrared wavelength, the response speed of 0.76 µs, and suppressed dark current density of 1.6 × 10 −10 A cm −2 .
研究领域:
材料科学
·
光电探测器
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Tao Shen,Feng Li,Zhenyun Zhang,Lei Xu,Junjie Qi
Monolayer MoS2, a direct bandgap transition metal dichalcogenide (TMD), has attracted worldwide attention in electronics and optoelectronics. However, the performance of photodetectors based on monolayer MoS2 is restricted to a weak optical absorption, narrow absorption range, and persistent photoconductance. Herein, benefiting from an easy solution process, high light absorption coefficient, and wide absorption range, environment-friendly CuInSe2 quantum dots (QDs) are hybridized with monolayer MoS2 for high-performance broadband photodetectors. Owing to the favorable type-II energy band alignment of MoS2/CuInSe2-QDs, the hybrid photodetector exhibits a broadband photoresponse from the ultraviolet to near-infrared region, with an ultrahigh photoresponsivity of 74.8 A/W at 1064 nm, and compared with those of the pristine MoS2 device, the photoresponsivity and specific detectivity in the ultraviolet–visible region were enhanced by about 30 and 20 times, respectively. Furthermore, the formed depletion region at the MoS2/CuInSe2-QDs interface can significantly increase the photoresponse speed, and the accumulated holes in the QD side induce a strong photogating effect to improve the photoresponsive characteristics of the hybrid photodetector. Our work opens up opportunities for fabricating high-performance monolayer TMD-based broadband photodetectors.
研究领域:
光电子学
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纳米材料
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量子点
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光电探测器
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二维材料
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 17
·期 8
·4482-4488
·
IF 8.02
Xiaojiao Kang,Yanchun Yang,Lijian Huang,Ying Tao,Lan Wang,Daocheng Pan
Water-soluble CuInSe2/ZnS (CISe/ZnS) and AgInSe2/ZnS (AISe/ZnS) core/shell quantum dots (QDs) on a multigram scale have been synthesized by using gelatin and thioglycolic acid as dual stabilizers in an electric pressure cooker. The core/shell QDs present composition-tunable emission in the range of 582 nm to 686 nm with a maximum PLQY of 23.3%. The core/shell QDs also exhibit good water/buffer stability. The red-emitting CISe/ZnS QDs are applied as wavelength converters to achieve warm white light-emitting diodes.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Weili Li,Hongchao Geng,Lu Yao,Haiyan Xu,Yongjun Han,Pengtao Sheng
Oil phase CuInSe 2 quantum dots (CISe QDs) were synthesized via a hot-injection method, exhibiting a near-infrared (NIR) emission wavelength of 710 nm with poor fluorescence intensity. Therefore, we address this challenge by introducing two strategies: doping and ligand exchange. First, Zn was used as a dopant to improve the fluorescent properties of CISe QDs synthesized by the same method. The PL peak position of the resulting Zn–CuInSe (ZnCISe) QDs could be tuned from 600 nm to 662 nm, and the PL intensity of the QDs was greatly improved. Except that, this Zn doping strategy can help to improve the fluorescence lifetime and reduce defects, leading to increased quantum yield. Next, the aqueous phase transfer of ZnCISe QDs was achieved through an efficient ligand exchange strategy using glutathione (GSH) as the bifunctional ligand. Mercaptoacetic acid (MPA) was also used as an essential additive for GSH ligand exchange. With this method, we obtained high-quality hydrophilic ZnCISe QDs with particle sizes less than 3 nm and good monodispersity. In addition, DLS measurements showed a unimodal peak shape of the hydrated ZnCISe QDs in ultrapure water with particle sizes ranging from 7 nm to 40 nm. Finally, the cytotoxicity studies revealed that the viabilities of the cells incubated with ZnCISe QDs from 1 μ g/mL to 18 μ g/mL remained at levels greater than 90%, which indicates that QDs with good biocompatibility are promising fluorescent probes.
研究领域:
材料科学
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生物医学
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产品关联
DOI
高影响因子
Nanoscale Advances
·
2021
·Vol. 3
·期 8
·2334-2342
·
IF 4.553
Senlin Qu,Xin Yuan,Yu Li,Xingyang Li,Xiujuan Zhou,Xiaogang Xue,Kexiang Zhang,Juan Xu,Changlai Yuan
The composition and defect tolerance of CuInSe2 (CISe) quantum dots (QDs) provide a scaffold to design defects via tailoring the elemental ratio or distributions for boosting photocatalytic H2 evolution (PHE). Herein, a ligand-assisted two-step aqueous method was developed to prepare defect CISe quantum dots for the first time. UV-vis, XPS, HRTEM, and HADDF investigations confirmed the typical double-absorption edges of copper vacancy defects and indium substituted at copper site defects in the structure constructed through initial synthesis tuned by Cu/In ratio and the ensued coarsening. The steady-transient PL suggested that the D–A recombination with prolonged PL lifetime dominated the emission of composition-optimized CuInSe2 with the Cu/In ratio of 1/4 (CISe-1/4). Further transient photocurrent and electrochemical impedance spectroscopy investigations demonstrated that surface defects in the structure favor the carriers' separation/transportation. The CISe-1/4 exhibited a superior PHE rate of 722 μmol g−1 h−1, about 23 times higher than that of the initially synthesized CISe-1/4 nucleus (31 μmol g−1 h−1), with a maximum apparent quantum efficiency (AQE) of 1.3%. The analysis of energy levels and the coulombic interaction energy of electron–hole (Je/h) based on Raman, extending UV-vis spectra investigations suggested that surface defects resulted in decreased Je/h of CISe-1/4, favoring the enhanced PHE of this structure. This work is expected to provide a reference for designing effective non-noble metal I–III–VI photocatalysts.
研究领域:
材料科学
·
化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2022
·
IF 18.027
Yingying Li,Peisen Zhang,Wen Tang,Kevin J. McHugh,Stephen V. Kershaw,Mingxia Jiao,Xiaodan Huang,Sergii Kalytchuk,Collin F. Perkinson,Saisai Yue,Yuanyuan Qiao,Lichong Zhu,Lihong Jing,Mingyuan Gao,Buxing Han
Improving the effectiveness of cancer therapy will require tools that enable more specific cancer targeting and improved tumor visualization. Theranostics have the potential for improving cancer care because of their ability to serve as both diagnostics and therapeutics; however, their diagnostic potential is often limited by tissue-associated light absorption and scattering. Herein, we develop CuInSe2@ZnS:Mn quantum dots (QDs) with intrinsic multifunctionality that both enable the accurate localization of small metastases and act as potent tumor ablation agents. By leveraging the growth kinetics of a ZnS shell on a biocompatible CuInSe2 core, Mn doping, and folic acid functionalization, we produce biocompatible QDs with high near-infrared (NIR)-II fluorescence efficiency up to 31.2%, high contrast on magnetic resonance imaging (MRI), and preferential distribution in 4T1 breast cancer tumors. MRI-enabled contrast of these nanoprobes is sufficient to timely identify small metastases in the lungs, which is critically important for preventing cancer spreading and recurrence. Further, exciting tumor-resident QDs with NIR light produces both fluorescence for tumor visualization through radiative recombination pathways as well as heat and radicals through nonradiative recombination pathways that kill cancer cells and initiate an anticancer immune response, which eliminates tumor and prevents tumor regrowth in 80% of mice.
研究领域:
治疗诊断学
·
癌症成像
·
纳米医学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Photonics
·
2023
·Vol. 17
·期 4
·346-353
·
IF 35
Liang Wenfei,Nie Chengming,Du Jun,Han Yaoyao,Zhao Guohui,Yang Fan,Liang Guijie,Wu Kaifeng
Near-infrared-to-visible photon upconversion holds great promise for a diverse range of applications. Current photosensitizers for triplet-fusion upconversion across this spectral window often contain either precious or toxic elements and have relatively low efficiencies. Although colloidal nanocrystals have emerged as versatile photosensitizers, the only family of nanocrystals discovered for near-infrared upconversion is the highly toxic lead chalcogenides. Here we report zinc-doped CuInSe 2 nanocrystals as a low-cost and lead-free alternate, enabling near-infrared-to-yellow upconversion with an external quantum efficiency reaching 16.7%. When directly merged with photoredox catalysis, this system enables efficient near-infrared-driven organic synthesis and polymerization, which in turn solves the issue of reabsorption loss for nanocrystal-sensitized upconversion. Moreover, the broadband light capture of these nanocrystals enables very rapid reactions under indoor sunlight. Extending the reach of ‘solar synthesis’ into the near-infrared may realize the century-long dream of conducting high-added-value chemical transformations using sunlight.
研究领域:
光子学
·
纳米技术
·
材料科学
·
化学
·
太阳能
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yiqing Chen,Feiyue Ge,Yueling Lai,Lianju Wang,Xianglong Zhao,Ruilin Wang,Shou Peng,Xue-Jun Wu,Yufeng Zhou
Conventional luminescent solar concentrators (LSCs) usually only have the ability to absorb solar energy and convert it to electricity but are not able to regulate the transmitted light. Herein, a multistate thermoresponsive smart window (SW) based on LSC has been fabricated, in which the stimuli-responsive host layer consists of polydimethylsiloxane (PDMS) and ethylene glycol solution (EGS) microdroplets stacking with LSC layer-based on near-infrared (NIR) CuInSe2–xSx/ZnS core/shell quantum dots (QDs) and PDMS matrix. As-synthesized CISSe/ZnS QDs with broad NIR absorption in LSC exhibit controllable emission spectra over 833–1088 nm and high photoluminescence (PL) quantum yield from 45 to 83%. Coupling with Si solar cells as a reference, optimized LSC-SW devices with dimensions of 5 × 5 × 0.9 cm3 exhibit higher power conversion efficiency (PCE) of 1.19–1.36% with increased temperature from 0 to 50 °C than those of sole LSC and SW devices. The corresponding visible light transmissions are regulated from 75.1 to 48.1% accordingly. The improvement of PCEs in an opaque state is mainly due to enhanced absorption of QDs originating from rescattered photons from the EGS/PDMS layer, leading to more emitted photons reaching photovoltaics. This work is expected to bring up new opportunities for applications in greenhouses, building facades, and energy-efficient smart windows.
研究领域:
材料科学
·
能源技术
·
光电子学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）