ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 35
·84002-84010
·
IF 5.8
Yang Zhenhua,Yang Xintong,Zhang Yuexia,Fan Xiaopeng,Cao Yujuan,Li Zhongping,Dong Chuan
Amphiphilic blue-fluorescence carbon dots (B-CDs) were synthesized via pyrolysis method with citric acid and oleamine as precursors. B-CDs are monodispersed in ethanol, toluene, and ultrapure water with the average particle sizes of 3.33 nm, 2.05 nm, and 4.12 nm, respectively. The maximum emission wavelength of the B-CDs excitation at 370 nm is located at 459 nm. The B-CDs have good optical properties with excellent photostability. The fluorescence quantum yield (QY) of the as-prepared CDs is as high as 30.17%. The fluorescence of B-CDs is quenched because of static quenching by oxytetracycline. A high selective and sensitive fluorescence probe for detecting oxytetracycline was constructed with a linear range of 1.52–27.60 µg/mL and the detection limit of 0.33 µg/mL. The B-CDs-based fluorescence probe can be applied to analyze oxytetracycline in milk; the recoveries and relative standard are satisfactory. Furthermore, the B-CDs were exploited for imaging of SH-SY5Y cells. The results demonstrate that as-synthesized CDs can serve as a cellular imaging reagent owing to remarkable bioimaging performance. This work provides a new strategy for the detection of oxytetracycline in food.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 29
·15833-15843
·
IF 11.9
Yi Tao,Zikun Tang,Yihong Zhong,Dequan Bao,Zhenqiu Gao,Wei Zhao,Zhen Wen,Hao Zhang,Kanghong Wang,Xuhui Sun
Photoelectrochemical (PEC) water splitting is a promising approach for the conversion of solar energy to hydrogen fuel. However, the solar-to-hydrogen (STH) efficiency is still restricted by the kinetically sluggish oxidation reaction on the surface of the photoanode. Herein, a unique composite structure (ZnO@NiO–QDs) was developed as the photoanode, in which the highly dispersed ZnO (d-ZnO) particles derived from the pyrolysis of ZIF-8 serve as the scaffolds to support NiO (cocatalysts) and colloidal CdSe(CdSexS1−x)4(CdS)2 QDs (denoted as CAS, a light absorber). Due to the enhanced hole consumption accelerated by NiO cocatalysts, the optimized photoanode (d-ZnO@NiO0.03–CAS) exhibits a higher saturated current density (Jsc) of 21.7 mA cm−2 than the d-ZnO–CAS photoanode (15.6 mA cm−2) under standard one sun (AM 1.5 G, 100 mW cm−2) solar irradiation. More importantly, such an electrode can still work as an electrocatalyst under light-off conditions via a sole electrochemical (EC) process. Thus, a well-designed bifunctional electrode that integrates cocatalysts and light absorbers makes it possible to generate hydrogen efficiently under both light-on and light-off conditions, providing an efficient and low-cost paradigm to improve the hydrogen evolution performance.
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ACS Nano
·
2023
·
IF 17.1
Yingying Niu,Xin Zhou,Wei Gao,Maixia Fu,Yule Duan,Jiandong Yao,Bing Wang,Mengmeng Yang,Zhaoqiang Zheng,Jingbo Li
Driven by the rapid development of autonomous vehicles, ultrasensitive photodetectors with high signal-to-noise ratio and ultraweak light detection capability are urgently needed. Due to its intriguing attributes, the emerging van der Waals material, indium selenide (In2Se3), has attracted extensive attention as an ultrasensitive photoactive material. However, the lack of an effective photoconductive gain mechanism in individual In2Se3 inhibits its further application. Herein, we propose a heterostructure photodetector consisting of an In2Se3 photoactive channel, a hexagonal boron nitride (h-BN) passivation layer, and a CsPb(Br/I)3 quantum dot gain layer. This device manifests a signal-to-noise ratio of 2 × 106 with responsivity of 2994 A/W and detectivity of 4.3 × 1014 Jones. Especially, it enables the detection of weak light as low as 0.03 μW/cm2. These performance characteristics are ascribed to the interfacial engineering. In2Se3 and CsPb(Br/I)3 with type-II band alignment promote the separation of photocarriers, while h-BN passivates the impurities on CsPb(Br/I)3 and promises a high-quality carrier transport interface. Furthermore, this device is successfully integrated into an automatic obstacle avoidance system, demonstrating promising application prospects in autonomous vehicles.
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ACS Nano
·
2023
·
IF 17.1
Mengfan Li,Chenming Huang,Hao Yang,Yu Wang,Xiangcong Song,Tao Cheng,Jietao Jiang,Yangfan Lu,Maochang Liu,Quan Yuan,Zhizhen Ye,Zheng Hu,Hongwen Huang
Controllable synthesis of nanoscale high-entropy alloys (HEAs) with specific morphologies and tunable compositions is crucial for exploring advanced catalysts. The present strategies either have great difficulties to tailor the morphology of nanoscale HEAs or suffer from narrow elemental distributions and insufficient generality. To overcome the limitations of these strategies, here we report a robust template-directed synthesis to programmatically fabricate nanoscale HEAs with controllable compositions and structures via independently controlling the morphology and composition of HEA. As a proof of concept, 12 kinds of nanoscale HEAs with controllable morphologies of zero-dimension (0D) nanoparticles, 1D nanowires, 2D ultrathin nanorings (UNRs), 3D nanodendrites, and vast elemental compositions combining five or more of Pd/Pt/Ag/Cu/Fe/Co/Ni/Pb/Bi/Sn/Sb/Ge are synthesized. Moreover, the as-prepared HEA-PdPtCuPbBiUNRs/C demonstrates the state-of-the-art electrocatalytic performance for the ethanol oxidation reaction, with 25.6- and 16.3-fold improvements in mass activity, relative to commercial Pd/C and Pt/C catalysts, respectively, as well as greatly enhanced durability. This work provides a myriad of nanoscale HEAs and a general synthetic strategy, which are expected to have broad impacts for the fields of catalysis, sensing, biomedicine, and even beyond.
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Small
·
2023
·Vol. 19
·期 45
·2303247
·
IF 13.3
Yuhe Bi,Sheng Cao,Peng Yu,Zhentao Du,Yunjun Wang,Jinju Zheng,Bingsuo Zou,Jialong Zhao
High color purity blue quantum dot light-emitting diodes (QLEDs) have great potential applications in the field of ultra-high-definition display. However, the realization of eco-friendly pure-blue QLEDs with a narrow emission linewidth for high color purity remains a significant challenge. Herein, a strategy for fabricating high color purity and efficient pure-blue QLEDs based on ZnSeTe/ZnSe/ZnS quantum dots (QDs) is presented. It is found that by finely controlling the internal ZnSe shell thickness of the QDs, the emission linewidth can be narrowed by reducing the exciton-longitudinal optical phonon coupling and trap states in the QDs. Additionally, the regulation of the QD shell thickness can suppress the Förster energy transfer between QDs in the QLED emission layer, which will help to reduce the emission linewidth of the device. As a result, the fabricated pure-blue (452 nm) ZnSeTe QLED with ultra-narrow electroluminescence linewidth (22 nm) exhibit high color purity with the Commission Internationale de l'Eclairage chromatic coordinates of (0.148, 0.042) and considerable external quantum efficiency (18%). This work provides a demonstration of the preparation of pure-blue eco-friendly QLEDs with both high color purity and efficiency, and it is believed that it will accelerate the application process of eco-friendly QLEDs in ultra-high-definition displays.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaofeng Lai,Song Wang,Ying Xie,Binghang Liu,Jianhui Sun,Yuxin Li,Haitao Yu,Kai Pan
CsPbBr3 perovskite nanocrystals have emerged as promising candidates for photocatalysis. However, their conversion efficiency is hampered by material instability, and the accumulation of deactivated perovskites produced after photocatalytic reactions raises significant environmental concerns. To address this issue, we developed a mechanochemical grinding approach assisted by oleylamine as an additive to restore the optical properties and photocatalytic activity of deactivated CsPbBr3, which was due to aggregation in the photocatalytic CO2 reduction reaction. Upon regeneration, the CsPbBr3 nanocrystals exhibited an average length of 34.21 nm and an average width of 20.86 nm, demonstrating optical properties comparable to those of the pristine CsPbBr3 nanocrystals. Moreover, they achieved a conversion efficiency of 88.7% compared with pristine CsPbBr3 nanocrystals in the photocatalytic CO2 reduction reaction. This method effectively enhanced the utilization of CsPbBr3, offering a novel approach for the recycling and recovery of perovskite materials and thereby minimizing material waste and environmental pollution.
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Solar RRL
·
2023
·Vol. 7
·期 18
·2300370
·
IF 7.9
Jianhang Qi,Jiale Liu,Kai Chen,Yongming Ma,Yanjie Cheng,Wei Wang,Zhaozhen Cui,Chaoyang Wang,Yaqiong Su,Anyi Mei,Hongwei Han
The photovoltaic, luminescence, and detector fields have witnessed the robust application prospects of solution-processed halide perovskites. Deep insights into solution can pave the way toward the precise crystallization control of halide perovskites for giving full play to the advantages of those materials. Herein, the dissolution behavior of formamidinium lead iodide (FAPbI 3 ) together with lead iodide in amide solvents with regulated coordination ability at increasing temperature and under different molar ratio between formamidinium iodide (FAI) and PbI 2 is studied. The solvent coordination ability, temperature, and FAI/PbI 2 molar ratio demonstrate equivalent influence on the dissolution, and increasing those factors tends to increase the solubility first and decrease it then for Pb compounds. It is proposed that there are interchangeable Pb solute forms including solvent-containing lead complexes and solvated lead halide fragments in solution and the interconversion of both solutes driven by the above factors brings the solubility change. The modulated dissolution affects the crystallization behaviors of FAPbI 3 when preparing single crystals, nanocrystal dispersions, and thin films, and allows for regulated crystallinity in printable mesoscopic solar cells which demonstrate a power conversion efficiency of 18.40%.
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Lubricants
·
2023
·Vol. 11
·期 7
·280
·
IF 3.5
Yiping Sun,Cheng Jiang,Qin Zhao,Xiaobo Wang,Wenjing Lou
The content of Cu2+in lubricants is an essential indicator for determining the quality of the lubricant and predicting mechanical failure. Finding an effective and sensitive method for detecting Cu2+in lubricants is of great importance in oil monitoring. In this work, AgInS2(AIS) and AgInS2-ZnS (ZAIS) nanoparticles (NPs) were synthesized by a simple one-step approach via in-situ surface modification by oleylamine. The as-synthesized AIS and ZAIS NPs exhibit good dispersion stability in various apolar media. The photoluminescence (PL) of AIS and ZAIS NPs as lubricating additives could reflect and monitor the lubrication state of steel-copper pairs due to the quenching effect of Cu2+from the friction process. With an optimum concentration of 0.5 wt% in paraffin oil, the friction coefficient of the AIS and ZAIS NPs at 100 N was decreased by 56.8 and 52.1% for steel-steel contacts, respectively. ZAIS was observed to be more effective than AIS in improving anti-wear (AW) and extreme pressure (EP) properties, with a load-bearing capacity of up to 1100 N. Characterization of the wear tracks by SEM and XPS indicates that a tribofilm composed of metal sulfides and oxides was formed during the lubricating process. This work not only reveals AIS and ZAIS NPs as a new class of promising candidates for lubricating additives but also unveils their potential for monitoring lubricant conditions and exploring lubricant service life.Keywords:AgInS2;AgInS2-ZnS;lubricant additive;friction and wear;photoluminescence
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shiwei Xue,Hengbin Mao,Junhui Li,Xinge Sun,Ziyu Gong,Bingbing Fan,Gang Shao,Hailong Wang,Hongliang Xu,Rui Zhang,Hongxia Lu
All-inorganic lead halide perovskite nanocrystals (NCs) have attracted considerable attention in field of optoelectronics due to their excellent properties such as high PLQY , tunable emission spectra in visible light region, and narrow emission peaks. However, problems existing in the research of all-inorganic lead halide perovskite materials are high lead content, low stability, and complex synthesis processes. Those problems need to be solved urgently. Therefore, dual-phase Cs‘B’Br 3 /Cs‘B’ 2 Br 5 perovskite material (Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 )Br 3 /Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 ) 2 Br 5 ) was synthesized by doping the B-site of CsPbBr 3 and CsPb 2 Br 5 using high-energy ball milling in this thesis. This dual-phase perovskite material has maximum absorption edge of 540 nm, a band gap width of 2.22 eV, the maximum emission peak at 600 nm with FWHM of 72 nm, PLQY of 24.50%, and an average fluorescence lifetime of 227.87 μs. After 21 days at room temperature, luminescent intensity of NCs increased to 156%, and still retained 109% at 120 days. After treatment at 150 °C, luminescent intensity decreased to 47%. Results show that this high-entropy dual-phase perovskite has great stability in different temperature. This proves that synthesis of high-entropy dual-phase halide perovskite by high-energy ball milling is feasible, and has great significance in solving poor stability and high lead content of all-inorganic lead halide perovskite in the future.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chenjing Zhao,Chunrong Zhu,Yue Yu,Wenhao Xue,Xiaoyun Liu,Fang Yuan,Jinfei Dai,Shuangpeng Wang,Bo Jiao,Zhaoxin Wu
Lead halide perovskite quantum dots (QDs) have attracted great interest for application in light-emitting diodes (LEDs) due to their high photoluminescence quantum yield (PLQY), solution processability, and high color purity, showing great potential for next-generation full-color display and lighting technologies. Conventional long-chain insulating oleic acid (OA)/oleamine (OAm) ligands exhibit dynamic binding to the surface of QDs, resulting in a plethora of extra surface defects and inferior optoelectronic properties. Herein, a sole multifunctional ligand with optimized carbon chain length, that is, 2-thiophenepropylamine bromide (ThPABr), was creatively designed and introduced into CsPbBr3 QDs, which not only replaces OAm and provides a bromine source but also coordinates with the uncoordinated surface Pb2+ of QDs through the thiophene, passivating surface defects and increasing the PLQY of the film to 83%. More importantly, the interaction between the electron donor–thiophene ring and QDs can enhance electron injection and improve carrier balance. The resulting green LED exhibited significant performance improvement, showing ultrahigh spectral stability under high operating voltage, achieving a maximum external quantum efficiency of 10.5%, and extending the operating lifetime to 5-fold that of the reference. Designing a single multifunctional ligand presents a promising and convenient strategy for selecting surface ligands that can enhance the performance of LEDs or other optoelectronic devices.
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Biosensors-Basel
·
2023
·Vol. 13
·期 8
·770
·
IF 5.4
Lei Deng,Feng Huang,Aomei Zhang,Tingting Wang,Minghui Yang,Xiaoqing Li,Xiang Chen
Halide lead perovskite has attracted increased attention due to its excellent optical properties. However, the poor stability of the halide lead perovskite nanocrystals has been a major obstacle to their application in biosensing. Here, we proposed a method to synthesize CsPbBr3/BSA NCs perovskite using bovine serum albumin (BSA) as a zwitterion ligand. Then, a fluorescent sensor for alkaline phosphatase determination based on CsPbBr3/BSA NCs was successfully built via the interaction of L-ascorbic acid (AA) with BSA on the perovskite surface. Under optimal conditions, the sensor showed a linear concentration range from 50 to 500 μM with a detection limit of 28 μM (signal-to-noise ratio of 3) for AA, and demonstrated a linear concentration range from 40 to 500 U/L with a detection limit of 15.5 U/L (signal-to-noise ratio of 3) for alkaline phosphatase (ALP). In addition, the proposed fluorescent biosensor exhibited good selectivity and recovery in the determination of ALP in human serum. This strategy offers an innovative way for enhancing the water stability of lead halide perovskite and promoting their application in biosensing areas.Keywords:perovskite;fluorescence sensing;alkaline phosphatase;L-ascorbic acid
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ORGANIC ELECTRONICS
·
2023
·
IF 3.2
Shengfeng Tang,Yu Zhao,Jiachen Kang,Wenzhe Huang,Gufeng He
Surface vacancies are commonly formed during the synthesis and purification of perovskite nanocrystals (NCs), which usually lower the photoluminescence quantum yield (PLQY) and stability. In this study, we demonstrate a facile post-synthetic treatment with SnBr 2 to passivate the existing Pb 2+ and Br − vacancies on the surface of CsPbBr 3 NCs. The PLQY of passivated NCs in the solution increases from 73% to 94%, and the average fluorescence lifetime of CsPbBr 3 NC film is prolonged from 7.77 to 9.78 ns, indicating a higher degree of radiative recombination of electron-hole pairs. The CsPbBr 3 NCs treated by SnBr 2 present higher stability with 82% of the original PLQY after two weeks of storage in ambient atmosphere, while the PLQY of untreated NCs drastically drops to 58%. Furthermore, the maximum current efficiency of the light-emitting diode based on the modified CsPbBr 3 NCs is enhanced by a factor of 2.5. It is believed that the proposed post-synthetic treatment method is promising in enhancing the PLQY and stability of perovskite NCs, as well as promoting the efficiency of the electroluminescent device.
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