InfoMat
·
2023
·
IF 22.7
Peilin Liu,Shuaicheng Lu,Jing Liu,Bing Xia,Gaoyuan Yang,Mo Ke,Xuezhi Zhao,Junrui Yang,Yuxuan Liu,Ciyu Ge,Guijie Liang,Wei Chen,Xinzheng Lan,Jianbing Zhang,Liang Gao,Jiang Tang
Lead sulfide (PbS) colloidal quantum dot (CQD) photodiodes integrated with silicon-based readout integrated circuits (ROICs) offer a promising solution for the next-generation short-wave infrared (SWIR) imaging technology. Despite their potential, large-size CQD photodiodes pose a challenge due to high dark currents resulting from surface states on non-passivated (100) facets and trap states generated by CQD fusion. In this work, we present a novel approach to address this issue by introducing double-ended ligands that supplementally passivate (100) facets of halide-capped large-size CQDs, leading to suppressed bandtail states and reduced defect concentration. Our results demonstrate that the dark current density is highly suppressed by about an order of magnitude to 9.6 nA cm −2 at −10 mV, which is among the lowest reported for PbS CQD photodiodes. Furthermore, the performance of the photodiodes is exemplary, yielding an external quantum efficiency of 50.8% (which corresponds to a responsivity of 0.532 A W −1 ) and a specific detectivity of 2.5 × 10 12 Jones at 1300 nm. By integrating CQD photodiodes with CMOS ROICs, the CQD imager provides high-resolution (640 × 512) SWIR imaging for infrared penetration and material discrimination.
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ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Zhimin Li,Xiong Lu,Guiqiao Liu,Libin Yang,Faming Gao
Core-shell ZIF-8@ZIF-67 was synthesized by growing a cobalt-based ZIF-67 on a ZIF-8 seed particle. Herein, through selective etching of the ZIF-8@ZIF-67 core and subsequent direct carbonization , core-shell hollow ZnO@CoO nitrogen-doped nanoporous carbon (HZnO@CoO-NPC) nanocomposites were prepared. HZnO@CoO–NPCs possessed a high nitrogen content, large surface area, high degree of graphitization and excellent electrical conductivity , all of which were attributed to successfully integrating the unique advantages of ZIF-8 and ZIF-67. HZnO@CoO–NPCs were used to assemble acetylcholinesterase (AChE) biosensors for organophosphorus pesticides (OPs) detection. The low detection limit of 2.74 × 10 −13 M for chlorpyrifos and 7.6 × 10 −15 M for parathion-methyl demonstrated the superior sensing performance. The results showed that the electrochemical biosensor constructed by HZnO@CoO-NPC provided a sensitive and efficient electrochemical strategy for OPs detection.
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Nanoscale
·
2023
·Vol. 15
·期 38
·15635-15642
·
IF 6.7
Mingzhu Hu,Yumeng Wang,Shengpeng Hu,Zongpeng Wang,Bi Du,Yanjun Peng,Jiawei Yang,Yunjie Shi,Dongdong Chen,Xi Chen,Ziwen Zhuang,Zhixun Wang,Xi Chen,Jiecheng Yang,Yongshuai Ge,Eyu Wang,Quan Wen,Shuang Xiao,Ming Ma,Weimin Li,Jie Zhang,De Ning,Lei Wei,Chunlei Yang,Ming Chen
Scintillators with high spatial resolution at a low radiation dose rate are desirable for X-ray medical imaging. A low radiation dose rate can be achieved using a sufficiently thick scintillator layer to absorb the incident X-ray energy completely, however, often at the expense of low spatial resolution due to the issue of optical crosstalk of scintillation light. Therefore, to achieve high sensitivity combined with high-resolution imaging, a thick scintillator with perfect light guiding properties is in high demand. Herein, a new strategy is developed to address this issue by embedding liquid scintillators into lead-containing fiber-optical plates (FOPs, n = 1.5) via the siphon effect. The liquid scintillator is composed of perovskite quantum dots (QDs)/2,5-diphenyloxazole (PPO) and the non-polar high-refractive index (n = 1.66) solvent α-bremnaphthalene. Benefiting from the pixelated and thickness-adjustable scintillators, the proposed CsPbBr3 QDs/PPO liquid scintillator-based X-ray detector achieves a detection limit of 79.1 μGy s−1 and a spatial resolution of 4.6 lp mm−1. In addition, it displays excellent tolerance against radiation (>34 h) and shows outstanding stability under ambient conditions (>160 h). This strategy could also be applied to other liquid scintillators (such as CsPbCl3 QDs and Mn:CsPbCl3 QDs). The combination of high sensitivity, high spatial resolution and stability, easy fabrication and maintenance, and a reusable substrate matrix makes these liquid scintillators a promising candidate for practical X-ray medical imaging applications.
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Small
·
2023
·
IF 13.3
Zifu Qi,Longfei Yuan,Weigang Ding,Zhanpeng Qin,Shirong Wang,Hongli Liu,Xianggao Li
Quasi-2D (Q-2D) perovskites with typical varied n-phase structures deserve promising candidates in pursuing high-performance perovskite light-emitting diodes (PeLEDs). Whereas their weakness in precise n -phase distribution control disables the optical property of PeLEDs since the n = 1 phase is dominated by severe nonradiative recombination. Here, an effective phase distribution tailoring strategy is developed for pure blue PeLEDs by introducing taurine (TAU) into mixed halide Q-2D perovskites. The sulfonic acid group in TAU can coordinate with Pb 2+ to suppress the formation of the n = 1 phase while promoting the growth of Q-2D perovskites into domains with the graded distribution of n = 2 and 3. The amino group in TAU forms hydrogen bonds with electronegative halide ions, suppressing the formation of halide vacancies and reducing the defect density in the Q-2D perovskite films. As a result, optimized blue Q-2D perovskite films boosted PLQY to 92%. Target blue PeLED was endowed with a peak EQE of 14.82% (average 12.6%) at 475 nm and a maximum luminance of 1937 cd m −2 , which is among the reported high-level pure blue PeLEDs. This work demonstrates a feasible approach to regulate the phase distribution of Q-2D perovskites for high-performance blue PeLEDs.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
JunQiu Zhang,YueHong Pang,XiaoFang Shen
Copper nanoclusters (CuNCs) are attractive alternatives for fluorescent sensor, due to their low toxicity, strong biocompatibility, and inexpensive manufacturing cost. Herein, fluorescent CuNCs was rapidly synthesized in 2.5 min under microwave irradiation using L-cysteine (L-Cys) as the protective and reducing agent, and an “on-off-on” fluorescent sensor for tert-butylhydroquinone (TBHQ) was developed. In the presence of Fe 3+ ions, the fluorescence of L-Cys-CuNCs was quenched (turned off), then recovered after adding TBHQ (turn on). Under the optimized conditions, the TBHQ sensor had a wide linear range (2–350 μmol·L −1 ) and low detection limit (0.077 μg·mL −1 ). Furthermore, the relative standard deviation (RSD) were from 1.44% to 8.98% and the recoveries were from 94.53% to 108.99% for the determination of edible oil samples. Besides, the results detected by fluorescence sensor is in accordance with the results obtained in the traditional HPLC method. The microwave-assisted fast synthesis of CuNCs will expected to develop the fluorescent sensors for food safety and environmental analysis.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Tingting Li,Guoqiang Guo,Haoming Xing,Siyuan Tang,Houwen Hu,Linfan Wang,Xiaoqing Qian,Da Chen
For antibiotics misuse since the global outbreak of COVID 19, a novel strategy for discriminating and detecting antibiotics is proposed based on the graphene quantum dots with multi-doped heteroatoms including F, N and P (M-GQDs), which exhibit blue emission (419.0 nm) under the excitation of 336.0 nm. Specifically, the fluorescence of M-GQDs is quenched by tetracyclines (TCs) owing to inner filter effect (IFE) and enhanced by alkane-modified fluoroquinolones (AFQs), which is attributed to restricted conformational rotation based on π-π stacking, hydrogen-bonding and electrostatic interactions. Meanwhile, the electron-accepting property of oxazine ring in oxazine-modified fluoroquinolones (OFQs) increases emission peak at 498.0 nm and decreases emission peak at 419.0 nm as the color changes from blue to cyan. Moreover, a cascade system integrated with 3D microfluidic paper‐based analytical device (3D-μPAD) is applied successfully for visually distinguishing three antibiotics, which shows great potential and versatility of M-GQDs for food safety monitoring.
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Foods
·
2023
·Vol. 12
·期 13
·2487
·
IF 5.2
Ziqiang Li,Shuang Liang,Li Zhou,Fengjian Luo,Zhengyun Lou,Zongmao Chen,Xinzhong Zhang,Mei Yang
Glyphosate has excellent herbicidal activity, and its extensive use may induce residue in the environment and enter into humans living through the food chain, causing negative impact. Here, water-soluble 1.55 nm size nitrogen-doped carbon quantum dots (NCDs) with strong blue fluorescence were synthesized using sodium citrate and adenine. The maximum excitation and emission wavelengths of NCDs were 380 nm and 440 nm, respectively. The above synthesized NCDs were first used for the construction of a fluorescence sensor for glyphosate detection. It was found that Cu2+could quench the fluorescence of NCDs effectively through the photoinduced electron transfer (PET) process, which was confirmed using fluorescence lifetime measurements. Additionally, the fluorescence was restored with the addition of glyphosate. Hence, a sensitive turn-on fluorescence sensor based on NCDs/Cu2+for glyphosate analysis was developed. The LODs of glyphosate for water and rice samples were recorded as 0.021 μg/mL and 0.049 μg/mL, respectively. The sensor was applied successfully for ultrasensitive and selective detection of glyphosate in environmental water and rice samples with satisfied recoveries from 82.1% to 113.0% using a simple sample pretreatment technique. The proposed strategy can provide a significant potential for monitoring glyphosate residue in water and agricultural product samples.Keywords:carbon quantum dots;fluorescence;glyphosate detection;water;rice
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RSC Advances
·
2023
·Vol. 13
·期 28
·19039-19045
·
IF 3.9
Jie Zhang,Kai-Qi Sun,Zhong-Hui Zhang,Ri-Cheng Wang,Zi-Han Lin,Xiao-Wu Lei,Yu-Yin Wang,Ping Ju,Yuan-Chun He
Organic–inorganic hybrid low-dimensional lead halides have garnered significant interest in the realm of solid-state optical materials due to their unique properties and potential applications. In this study, we report the synthesis, characterization and application of Mn2+-doped one-dimensional (1D) [AEP]PbCl5·H2O hybrid lead halide perovskites with tunable photoluminescence properties. The Mn2+ doping leads to a redshift of the dominant emission wavelength from 463 nm to 630 nm, with the optimal doping concentration resulting in an enhanced photoluminescence quantum yield (PLQY) from less than 1% to 8.96%. The structural and optical stability of these doped perovskites have been thoroughly investigated revealing excellent performance under humid and high-temperature conditions. Perovskite–PVP composite films exhibit high crystallization and bright orange-red emission under UV excitation. Furthermore, we demonstrate the successful fabrication of a white LED device using the Mn2+-doped perovskite in combination with commercial green and blue phosphors. The fabricated LED exhibits a high color rendering index (CRI) of 87.2 and stable electroluminescence performance under various operating currents and extended operation times. Our findings highlight the potential of Mn2+-doped 1D hybrid lead halide perovskites as efficient and stable phosphors for high-performance white light emitting diodes and other optoelectronic applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Imtiaz Ahmad,Mohammed Abohashrh,Abdur Rahim,Sadia Ahmad,Tahir Muhmood,Hongli Wen
The substantial optical features of perovskite quantum dots (PQD) lead to rapid growth in the investigation of their surface and lattice doping for optoelectronic and biochemical sensor advancements. Herein, we have used the surface ligand crafting model of PQD by ammonia and its optimum response to recognise ammonia in the sensing cellulose paper. The PQD with acetyl amine and octanoic acid capped were synthesized and entrapped in zeolites imidazole framework to delay the instant quenching and envisaged response to ammonia with high sensitivity. The hybrid perovskite quantum dots and Zeolite imidazolate framework-8 (PQD@ZIF-8) materials were further immersed in cellulose paper for solid-state sensor fabrication for the detection of ammonia by naked-eye and a Xiaomi Note-5 mobile camera. The ammonia was measured with high sensitivity at ambient conditions, with a detection limit of 16 ppm and a linear detection range of 1 to 500 ppm. This research provides a new platform for designing sensor selectivity and sensitivity, which could be used to further develop fluorescent nanomaterials-based sensors for small molecule detection.
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Nature Chemistry
·
2023
·Vol. 15
·期 11
·1581-1590
·
IF 21.8
Chen Gaoyu,Liu Xiaoyu,An Jiakun,Wang Shibin,Zhao Xiaokun,Gu Zhongzheng,Yuan Caojin,Xu Xiangxing,Bao Jianchun,Hu Han-Shi,Li Jun,Wang Xun
Although their zero- to two-dimensional counterparts are well known, three-dimensional chiral hybrid organic–inorganic perovskite single crystals have remained difficult because they contain no chiral components and their crystal phases belong to centrosymmetric achiral point groups. Here we report a general approach to grow single-crystalline 3D lead halide perovskites with chiroptical activity. Taking MAPbBr 3 (MA, methylammonium) perovskite as a representative example, whereas achiral MAPbBr 3 crystallized from precursors in solution by inverse temperature crystallization method, the addition of micro- or nanoparticles as nucleating agents promoted the formation of chiral crystals under a near equilibrium state. Experimental characterization supported by calculations showed that the chirality of the 3D APbX 3 (where A is an ammonium ion and X is Cl, Br or mixed Cl–Br or Br–I) perovskites arises from chiral patterns of the A-site cations and their interaction with the [PbX 6 ] 4− octahedra in the perovskite structure. The chiral structure obeys the lowest-energy principle and thereby thermodynamically stable. The chiral 3D hybrid organic–inorganic perovskites served in a circularly polarized light photodetector prototype successfully.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 21
·1-10
·
IF 2.8
Yu Hongquan,Gao Xiao,Huang Chenchen,Liu Shimin,Chen Baojiu,Xu Sai,Zhang Yong,Zhao Hong
CsPbCl 3 and Mn:CsPbCl 3 nanocubes/nanorods were prepared by a hot injection technique. The crystal structure, size and morphology of the CsPbCl 3 and Mn:CsPbCl 3 samples were measured by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The edgelengths of the nanocubes and the length and width of the nanorods of CsPbCl 3 are between tens and hundreds of nanometers. The size and morphology of Mn:CsPbCl 3 are similar to those of CsPbCl 3 . The introduction of Mn 2+ ions led to little change in the CsPbCl 3 host structure. Their electrochemical properties for LIB application were tested by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. The introduction of a small amount of Mn 2+ ions can improve the structural stability of CsPbCl 3 during charge–discharge cycles because the Mn 2+ part replaces the Pb 2+ ions of CsPbCl 3 . Thus, Mn:CsPbCl 3 shows high discharge specific capacities, excellent cyclic performance, and lower electrochemical impedance values than CsPbCl 3 in LIB applications.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Dan Tang,Qin Wang,Shaojing Zhao,Jianing Yi,Minhuan Lan,Jie Zeng,Lei Huang
Herein, carbon dots (CDs) with bright yellow fluorescence were synthesized by using kaempferol as a carbon source, through a hydrothermal method in NaOH solution. The as-prepared CDs were highly soluble and spherical with uniform size and mean particle diameter of 3.2 nm. The CDs have unique high selectivity, sensitivity and anti-interference ability to mercury (Hg 2+ ). Under different pH conditions, Hg 2+ ions can still quench the fluorescence of CDs effectively and stably. On the other hand, cysteine can re-ignite the fluorescence of CDs as a result of strong chelation interaction that exists between -SH and Hg 2+ . There are good linear relationships between the concentration of Hg 2+ and (F 0 -F)/F 0 , the concentration of cysteine and (F-F 0 )/F 0 , and the detection limits are 1.6 μM and 0.8 μM, respectively. In addition, CDs can effectively detect Hg 2+ in tap water and lake water and detect cysteine in serum.
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