RSC Advances
·
2017
·Vol. 7
·期 5
·2810-2816
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IF 3.108
Zhaogan Wang,Peng Long,Yiyu Feng,Chengqun Qin,Wei Feng
Hydroxyl functionalized carbon dots (H-CDs) were prepared by monoesterification of ethylene glycol. The H-CDs exhibit a narrow size distribution of 1–4 nm and enhanced photoluminescent (PL) intensity due to an increased amount of electron donor hydroxyl groups. According to fluorescence spectra, the H-CDs exhibit a high sensitivity to Fe3+ with a detection limit of 2.56 nM, which is superior to the detection limit of CDs (7.4 μM). The quenching fluorescence is primarily controlled by the formation of a chelate compound based on the complexation between Fe3+ and the hydroxyl on the surface of the H-CDs. Furthermore, we demonstrate that paper impregnated with H-CDs exhibits a high sensitivity to Fe3+ by fluorescence quenching. In the future, the modified CDs can be developed for high sensitivity fluorescent probes by optimizing the chemical structures and microstructures.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yangqin Gao,Yandong Li,Guoqing Yang,Songsong Li,Nan Xiao,Boran Xu,Shuang Liu,Ping Qiu,Shijie Hao,Lei Ge
Fe2TiO5 was synthesized via the solvothermal method and adopted as co-catalyst to improve the photoelectrochemical (PEC) water splitting performance of BiVO4 photoanode. After surface modification by Fe2TiO5, the BiVO4/Fe2TiO5 photoanode shows a 300 mV cathodic shift in onset potential and 3 times enhancement in photocurrent, which delivers a photocurrent density of 3.2 mA/cm2 at 1.23 V vs reverse hydrogen electrode. Systematic optical, electrochemical, and intensity-modulated photocurrent spectroscopy characterizations were performed to explore the role of Fe2TiO5 and reveal that the enhanced PEC performance is mainly caused by the surface passivation effect of Fe2TiO5.
研究领域:
材料科学
·
能源研究
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产品关联
DOI
PubMed
高影响因子
SENSORS
·
2025
·Vol. 25
·期 9
·2740
·
IF 3.5
Xuefeng Huangfu,Junyu Chen,Gaohui Ge,Jianyu Li,Jiazhen Zhang,Qinhao Lin,Hao Xu,Shu Min Wang
Due to high responsivity and wide spectral sensitivity, metal halide perovskite photodiodes have a wide range of applications in the fields of visible light and near-infrared photodetection. Specific detectivity is an important quality factor for high-performance perovskite-based photodiodes, while one of the keys to achieving high detectivity is to reduce dark current. Here, 3-fluoro phenethylammonium iodide (3F-PEAI) was used to passivate the perovskite surface and form the two-dimensional (2D) perovskite on the three-dimensional (3D) perovskite surface. The as-fabricated passivated perovskite photodiodes with 2D/3D hybrid-dimensional perovskite heterojunctions showed two orders of magnitude smaller dark current, larger open circuit voltage and faster photoresponse, when compared to the control perovskite photodiodes. Meanwhile, it maintained almost identical photocurrent, achieving a high specific detectivity up to 2.4 × 1012Jones and over the visible-near-infrared broadband photodetection. Notably, the champion photoresponsivity value of 0.45 A W−1was achieved at 760 nm. It was verified that the 2D capping layers were able to suppress trap states and accelerate photocarrier collection. This work demonstrates strategic passivation of surface iodine vacancies, offering a promising pathway for developing ultrasensitive and low-power consumption photodetectors based on metal halide perovskites.
研究领域:
材料科学
·
光电技术
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DOI
PubMed
高影响因子
ACS Nano
·
2021
·
IF 15.881
Sisi Liu,Kao Xiong,Kang Wang,Guijie Liang,Ming-Yu Li,Haodong Tang,Xiaokun Yang,Zhen Huang,Linyuan Lian,Manlin Tan,Kai Wang,Liang Gao,Haisheng Song,Daoli Zhang,Jianbo Gao,Xinzheng Lan,Jiang Tang,Jianbing Zhang
Infrared (IR) solar cells are promising devices for significantly improving the power conversion efficiency of common solar cells by harvesting the low-energy IR photons. PbSe quantum dots (QDs) are superior IR photon absorbing materials due to their strong quantum confinement and thus strong interdot electronic coupling. However, the high chemical activity of PbSe QDs leads to etching and poor passivation in ligand exchange, resulting in a high trap-state density and a high open circuit voltage (VOC) deficit. Here we develop a hybrid ligand co-passivation strategy to simultaneously passivate the Pb and Se sites; that is, halide anions passivate the Pb sites and Cd cations passivate the Se sites. The cation and anion hybrid passivation substantially improves the quality of PbSe QD solids, giving rise to an excellent trap-state control and prolonged carrier lifetime. A high VOC and a high short circuit current density (JSC) are achieved simultaneously in the IR QD solar cells based on this hybrid ligand treatment. Finally, a IR-PCE of 1.31% under the 1100-nm-filtered solar illumination is achieved in the PbSe QD solar cells, which is the highest IR-PCE for PbSe QD IR solar cells at present. Additionally, the PbSe QD devices show a high external quantum efficiency of 80% at ∼1295 nm.
研究领域:
材料科学
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太阳能技术
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纳米技术
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Xingqun Zhu,Zhan Li,Guojing Hu,Jing Li,Bin Xiang
Here, we realize manipulation of photoluminescence (PL) intensity of GQDs through various molecular weight of surface passivator. With the increase of passivator molecular weight, only the PL intensity increases. However, the peak positions and half-peak width of spectral line remain unchanged. Our results reveal that surface passivation with larger molecular weight only weakens the chemical activity of graphene quantum dots (GQDs) and the π-π stacking interaction between GQDs, but exerts less impact on GQDs intrinsic energy gap. Therefore, the weaker π-π stacking interaction and chemical activity induce the weaker non-radiative recombination, leading to enhanced fluorescence from radiative recombination.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Chenghao Li,Bin Lu,Xinyuan Wang,Yongjun Ma,Xianyan Ren,Cailin Liu,Haijun Yang
The passivation of carbon dots (CDs) are usually implemented through coupling reactions, which requires either specific functional groups on the surface of CDs or multiple steps. In this paper, we propose a feasible method to passivate CDs via in-situ free radical polymerization , which has no dependence on functional groups and thus is suitable for CDs prepared via either bottom-up or top-down route. Taking bare CDs that cut from active carbon by top-down method as an example. When putting acrylic acid , sodium methallyl sulfonate and acrylic phosphate ester as monomers into the bare CDs solution along with ammonium persulfate, stirring at room temperature for 2h, the monomers were polymerized and formed terpolymer-passivated CDs (T-CDs) of which quantum yields (QY) increased obviously. The QY of the bare CDs and the T-CDs were 0.2% and 29.1%, respectively. More interestingly, the bare CDs were found capable of constructing a redox-initiated couple with ammonium persulfate to initiate polymerization. Another example token to further approve the feasibility and universality of “in-situ free radical polymerization” passivation method is our reported poly (N-vinylcarbazole)-passivated CDs (PVK-CDs) that prepared by bottom-up method. The PVK-CDs were synthesized via thermal treatment of a mixture composed of citric acid and N-vinylcarbazole molecules at 300 °C for 2 h. During the process the citric acid was carbonized to provide pristine CDs and N-vinylcarbazole was in-situ polymerized on the surface of the pristine CDs through thermal initiation, which enhances the fluorescence QY up to 40%.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 6
·946-951
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IF 3.474
Zhen Huang,Guangmei Zhai,Zhiming Zhang,Changwang Zhang,Yong Xia,Linyuan Lian,Xiaoming Fu,Daoli Zhang,Jianbing Zhang
A low cost and large scale synthetic approach was developed for colloidal PbS quantum dots (QDs). The heat up strategy was adapted for large scale production, thioacetamide in oleylamine (OLA) was used as the sulphur precursor for low cost and safe synthesis, and PbCl2 in OLA was used as the lead precursor for a well passivated surface. Due to the balance between the diffusion coefficient and monomer oversaturation generated by the dissolution of small particles, an optimum growth temperature exists in the new synthesis. The synthesis was easily scaled up to produce 18 g of PbS QDs from one reaction batch, with a high chemical yield of ∼80% and the as synthesized QDs exhibit a high photoluminescence quantum yield of >40% and excellent air-stability of at least 60 days, due to the Cl− and oleate co-passivation.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 29
·1801405
·
IF 9.598
Lie Wu,Jiahong Wang,Jiang Lu,Danni Liu,Na Yang,Hao Huang,Paul K. Chu,Xue-Feng Yu
Black phosphorus (BP) possesses unique physical properties and, owing to its intrinsic instability, the proper surface and chemical coordination is the key point in many applications. Herein, a facile and efficient surface lanthanide-coordination strategy based on lanthanide (Ln) sulfonate complexes is designed to passivate and functionalize different BP-based nanostructures including quantum dots, nanosheets, and microflakes. By means of Ln–P coordination, the lone-pair electrons of phosphorus are occupied, thus preventing oxidation of BP, and the LnL 3 @BP exhibits excellent stability in both air and water. Furthermore, accompanied by the original photothermal performance of BP nanostructures, the Gd-coordinated BP has high R 1 relativities in magnetic resonance (MR) imaging, and other Ln (Tb, Eu, and Nd) coordinated BP structures exhibit fluorescence spanning the visible to near-infrared regions. Not only is LnL 3 surface passivation an efficient method to enhance the stability of BP, but also the MR or fluorescence derived from lanthanide ions extends the application of BP to optoelectronics and biomedical engineering.
研究领域:
材料科学
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生物医学工程
·
光学
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Linjie Wang,Xuechao Xu,Peng Liu,Mengzhu Wang,Xiangheng Niu,Jianming Pan
Abnormal levels of halide ions in drinking water have enormous threats to human health, and thus designing reliable and sensitive methods to quantify and distinguish these ions becomes extremely crucial. Herein, we develop a single-nanozyme colorimetric array based on target-induced differential surface passivation for the quantification and discrimination of Cl − , Br − and I − ions. Silver citrate (Ag 3 Cit) is designed as an oxidase mimic to efficiently catalyze the 3,3′,5,5′-tetramethylbenzidine (TMB) chromogenic reaction. When halide ions (Cl − , Br − and I − ) are present, due to their different precipitation interactions with the Ag(Ⅰ) entity in Ag 3 Cit, they can passivate the active surface of the nanozyme to various degrees, resulting in the inhibited TMB chromogenic reaction differentially. According to this principle, simple and efficient quantitative detection of Cl − , Br − and I − ions was achieved, with all the detection limits down to the nM level. By employing Ag 3 Cit as a single sensing element, a nanozyme catalysis-based colorimetric array was further established, and both individual and mixed ions were successfully distinguished by integrating the array with principal component analysis . Accurate identification of unknown samples was also verified via a double-blind protocol, indicating potential applications of the array in practice.
研究领域:
分析化学
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环境科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 6
·4161-4171
·
IF 3.553
Wang Pan,Wu Zhihai,Wu Manyu,Wei Jiao,Sun Yanni,Zhao Zhenfu
The low-cost, solution-processed and stable perovskite quantum dots (QDs) light-emitting diodes (QLEDs) have great potential applications for the new-generation displays technology and white-LEDs. The stability of perovskite QDs has been improved via polymers or inorganic encapsulation strategies, but at the cost of their semiconducting properties, so it is not suitable for active light-emitting devices. In this paper, the Zn-doped CsPbBr 3 /ZnS QDs heterojunction were fabricated via a simple solution-phase method, which demonstrated simultaneously enhanced the optical properties and stability of perovskite QDs films without damaging their semiconducting properties. The photoluminescence quantum yields and stability of the Zn-doped CsPbBr 3 /ZnS heterojunction QDs films have been significantly improved because of good surface passivation on the surface defects of perovskite QDs with ZnS nanoclusters and Zn 2+ doping. Finally, solution-processed n-ZnO nanoparticles (NPs) and p-NiO NPs as carrier transport layers are used to fabricate all-inorganic Zn-doped CsPbBr 3 /ZnS QLEDs. The QLEDs show high-efficiency green light emission with a maximum luminance of 8600 cd/m 2 and external quantum efficiency of 4.8%. Moreover, the researched green perovskite QLEDs also show good working stability after a long test time in the outside environment. This study may provide an effective way for the preparation high-performance perovskite QLEDs with good environmental stability, making practical applications possible.
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
APPLIED OPTICS
·
2025
·Vol. 64
·期 12
·3250-3254
·
IF 1.7
Bin Tan,Bin Tan,Zhijie Zhang,Zhijie Zhang,Zhenhua Wang,Zhenhua Wang,Wei Xiong,Jingzhou Li,Leimin Deng,Xin Zhan
Quantum dots (QDs) preserve short photoluminescence (PL) lifetime and are widely developed for optical wireless communication (OWC). However, QDs often suffer from surface defects that limit their performance. In this work, we investigate the impact of post-treatment with didodecyldimethylammonium bromide (DDAB) and ${{\rm PbBr}_2}$ on the OWC performance of ${{\rm CsPbBr}_3}$ QDs. The treatment significantly improves the PL properties, leading to an increased quantum yield of 98% and a prolonged PL lifetime of 1.24 times compared to untreated QDs. As a consequence, the ${-}{3}\;{\rm dB}$ bandwidth and maximum data transmission rates under on–off-keying (OOK) modulation are also enhanced, reaching 0.79 and 1.15 times those of pristine QDs, respectively. This improvement highlights the importance of surface passivation for optimizing ${{\rm CsPbBr}_3}$ QDs in OWC applications.
研究领域:
材料科学
·
光学工程
·
通信技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Fan Su,Zhiyue Liu,Jieyi Yuan,Li Hou,Tongyi Liang,Yifei Wang,Qinfang Zhang,Yong Dai,Shuhong Cao,Jingwen Chen
Mn 4+ -activated fluoride phosphors are promising luminescent materials for use in phosphor-converted white-light-emitting diodes (wLEDs). However, poor water resistance in high humidity environment, one of critical drawbacks of this type of phosphors, has limited their practical applications. To address this issue, we developed a new facile strategy to passivate the surface of phosphors by in situ constructing a dual Mn 4+ -rare protective layer using well-known aminocarboxyl complexants with mild reducibility and strong complexation property. Ethylenediamine tetraacetic acid (EDTA) was taken as a representative for the research in detail, and a typical Mn 4+ -doped fluorosilicate phosphor K 2 SiF 6 :Mn 4+ (KSFM) was selected to demonstrate the reliability of the proposed strategy. The surface passivation was achieved by simply dispersing KSFM in a saturated EDTA aqueous solution (KSFM-sEDTA) or a hydrofluoric acid solution containing a certain amount of EDTA (KSFM-EDTA), and then stirring for a short time at room temperature. The analysis results indicate that the dual Mn 4+ -rare surface layer is composed of a K 2 SiF 6 matrix shell and an organic coating of residual EDTA and/or its related compounds, and the layer constructed by Method 2 is more significant than that by Method 1. Both the luminescence performance and the water resistance of the passivated KSFM were greatly enhanced while the luminescence characteristics remained unchanged. When the water-eroded KSFM was re-treated with EDTA, the luminescence was dramatically restored due to removal of the manganese hydrolysates and repair of the crystal surface defects. The wLEDs assembled with KSFM-EDTA and KSFM-sEDTA phosphor exhibited intense white light with high luminous efficiency (LE, 170.61 lm/W and 162.51 lm/W), high color rendering index (CRI, 88.3 and 85.9), and low correlated color temperature (CCT, 3680 K and 3805 K), respectively. More importantly, the fabricated wLEDs retained high LE (90.6% and 88.6%) and no remarkable changes of CRI and CCT values after being aged at high temperature and humidity (85 °C, 85%) for 550 h, which are more superior to the wLED assembled with the pristine KSFM.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）