CHEMICAL ENGINEERING SCIENCE
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2023
·
IF 4.7
Guoqiang Guo,Qi Zheng,Tingting Li,Ting Zhang,Siyuan Tang,Lintao Li,Sineng Gao,Yan Tang,Da Chen
For facile and rapid detection of 4-nitrophenol (4-NP), we synthesize nitrogen-doped carbon dots (N-CDs) through microwave radiation treatment using melamine and o-phenylenediamine as precursors. We employed N-CDs as an ingenious ratiometric fluorescence sensor via a novel bimodal excitation behavior. As the concentration of N-CDs increases, the broad excitation peak splits into two excitation peaks. The blue-shift phenomenon appears at the short-wavelength excitation peak, while the long-wavelength excitation peak presents the red-shift. Consequently, 4-NP can be sensitively detected by N-CDs owing to the localization of inner filter effect (L-IFE) with the detection limit of 83 nM ranging from 0.083 to 80 µM. Moreover, a self-calibrating on-site sensing platform constructed by 3D printing technique realizes the visual 4-NP detection in actual samples based on bimodal excitation behavior and RGB analysis. Our work not only presents a novel perspective for visual 4-NP sensing, but also renders the integration of 3D printing technology and the CDs industry.
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Small
·
2023
·
IF 13.3
Cong Xie,Xiao Zhang,Hsueh Shih Chen,Ping Yang
The low photoluminescence (PL) efficiency and unstable features of small blue-emitting CsPbX 3 nanocrystals (NCs) greatly limit their applications in optoelectronics field. Herein, the synergistic and post-treatment kinetics are studied to create highly bright and anomalous stable violet (peak position of ≈408 nm) and blue (peak position of ∼ 466 nm) emitting perovskite NCs. Ligand and ion exchange mechanism are systematic studied by the evolution of absorption, PL, and fluorescence lifetime to evaluate ligand bonding, defect engineering, and non-radiative recombination. Didodecyl dimethyl mmonium chloride (DDAC) and CuX 2 post-synergistic treatment created DDAC-CsPbCl 3 -CuCl 2 and DDAC-CsPbCl 3 -CuBr 2 NCs that remained the phase composition, morphology, and size of CsPbCl 3 NCs. The PL efficiencies are drastically increased to 42 and 85% for violet- and blue-emitting NCs, respectively. The stability test indicated that the NCs enable against various harsh conditions (e.g., ultraviolet light irradiation and heat-treatment). The NCs retained their initial PL efficiency after 2 months under ambient conditions and UV light irradiation. These NCs also exhibited high stability after heat-treatment at 120 °C. The emitting NCs embedded in flexible films still revealed bright PL and high stability, suggesting current results provide a new avenue for the application in the field of optoelectronics.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Dejian Chen,Kunyuan Xu,Mingwei Yang,Jie Hu,Renfu Li,Decai Huang,Sisi Liang,Kun He,Linfeng Yuan,Shujian Wang,Cong Zhou,Jiaxuan Zhang,Haomiao Zhu
The extremely poor stability of perovskite nanocrystals (NCs) in polar solvent is a critical unsolved problem and seriously hinder their practical application scenarios. Herein, a surface chemistry engineering strategy is proposed for synthesizing robust CsPbX 3 (X = Cl, Br, I) NCs in non-toxic ethanol-based solvent by building an extensive inter-ligand H-bond network on perovskite lattice. The obtained unsealed CsPbX 3 NCs show unprecedented year-long stability in ethanol. Notably, a water (∼6–50%, v/v) post-treatment can obviously decrease surface defects of NCs, thus yielding a significant enhancement in their emission efficiency (increased from 9.6% to 83.4% for CsPbBr 3 NCs in ethanol). We further translated the obtained CsPbBr 3 NCs to fluorescent sensor and visible-light-driven photocatalysts, achieving ultra-high sensitivity (limit of detection is 11 nM) and high photocatalytic efficiency (>99% removal within 10 min). Overall, the low-cost, easy-to-process, highly efficient and ethanol/water tolerant perovskites NCs indicate their promising application prospect in multifunctional photoelectric devices.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 12
·7503-7513
·
IF 3.9
Mengmeng Zhu,Yunpeng Liu,Haojie Ding,Shulan Zhang,Mujing Qu,Tongtong Xuan,Huili Li
All-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have great application prospects in many fields due to their excellent photoelectric properties. However, CsPbX 3 NCs are extremely sensitive to water, heat, light, and oxygen, which leads to dramatic photoluminescence quenching and seriously restricts their future commercial applications. Herein, a novel, simple one-step solution strategy for synthesizing high-quality CsPbBr 3 NCs was reported. By the combination of the hot-injection process with the mesoporous template confinement effect of the KIT-6 matrix, the space-confined growth of NCs was precisely achieved. The CsPbBr 3 NCs encapsulated by KIT-6 (CsPbBr 3 @KIT-6 composite) exhibited a uniform size, a high photoluminescence quantum yield (PLQY) of up to 82%, and a narrow full width at half-maximum (FWHM) of 24 nm. Most importantly, CsPbBr 3 @KIT-6 powder composites had dramatically enhanced light, thermal and water stability in comparison with colloidal CsPbBr 3 NCs due to the dual protection of organic ligands and matrix templates. Ultimately, a white light-emitting diode (LED) device was successfully fabricated by encapsulating a mixture of green-emitting CsPbBr 3 @KIT-6 composite and red-emitting K 2 SiF 6 :Mn 4+ phosphor onto a blue-emitting InGaN LED chip. A color coordinate of (0.327, 0.337) and a wide color gamut of 128% NTSC well demonstrate their potential applications in lighting and display.
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CHEMICAL PHYSICS LETTERS
·
2023
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IF 2.8
Bo Zhang,Shuo Ding,Xuanyu Zhang,Lei Qian,Chaoyu Xiang
Due to the deep energy levels, the external quantum efficiency (EQE) of the blue perovskite light-emitting diode (PeLED) is far lower than its green, red, and near-infrared counterparts, which has exceeded 20%. The mismatched energy levels between perovskites and the hole transporting layer (HTL) still hinder the hole injection and consequent improvement of blue PeLED device performance. Here, a two-dimensional material, WS 2 (Tungsten disulfide), was introduced to match the energy levels between perovskites and HTL and enhanced the hole injection. The WS 2 HTL-based perovskite FAPbBr 3-x Cl x blue LED achieved a luminance of 990 cd/m 2 with an EQE of 3.24%, which surpasses the performance of previously reported for the formamidinium (FA) based system, indicating the potential of WS 2 for PeLEDs.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Yi Zhang,Qingbo Deng,Chang Tang,Minglu Zhang,Zilong Huang,Zhifeng Cai
Development of excellent sensors to determine trace concentrations of rifampicin is of intense importance for medicine analysis and human health. Herein, a facile and green fluorescent probe was established for the determination of rifampicin by using folic acid protected copper nanoclusters (FA-Cu NCs). Many characterization methods were applied for the analysis of the as-prepared FA-Cu NCs including UV–visible absorption spectra, fluorescence spectra, Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), fluorescence lifetime and X-ray photoelectron spectroscopy (XPS). The TEM image suggested that the as-prepared FA-Cu NCs were highly dispersed. The as-synthesized FA-Cu NCs emerged blue fluorescence under UV light and demonstrated maximum emission wavelength at 446 nm under the maximum excitation wavelength of 358 nm. After the addition of rifampicin, the FL intensities of FA-Cu NCs were uncommonly quenched. The related experimental data intimated that the quenching mechanisms were assumed to the inner filter effect (IFE) and static quenching. The as-proposed probe platform displayed an obvious linear relationship with rifampicin concentrations varying from 0.5 to 100 µM, and the corresponding detection limit (LOD) was 0.073 µM (S/N = 3). Finally, the as-established detection platform was successfully employed to analyze trace concentrations of rifampicin in real samples.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Tianjiao Xia,Yao Xie,Sai Bai,Xuetao Guo,Lingyan Zhu,Chi Zhang
Transport of graphene-based nanomaterials in porous media is closely related to background cations. This study examines the impacts of ionic specificity on the mobility of graphene oxide (GO) and reduced GO (RGOs) in saturated quartz sand. The transport of GO/RGOs as affected by monovalent cation Na + followed extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, whereas in solutions containing multivalent cations Zn 2+ and Al 3+ , cation bridging effect played a dominant role in the transport inhibition. Moreover, the adverse effects of the divalent cations on GO/RGOs migration obeyed the Hofmeister series, i.e. following the order of Pb 2+ > Cd 2+ > Zn 2+ . Batch adsorption experiments and DFT calculations further confirmed that cations of higher valences, and of the same valence but with larger ionic radii (smaller hydrated radii) interacted more strongly with GO/RGOs and sand grains via forming inner-sphere complexes. Thus, more favorable retention was observed through cation bridging between particles and collectors, and also via enhanced straining caused by particles aggregation. Furthermore, the sulfide-reduced GO (SR-GO) that contained more surface O-functional groups was impacted more remarkably by strong complexing cations than the pristine GO (P-GO), while the mobility of poorly functionalized irradiation-reduced GO (IR-GO) was less affected by cation bridging effect.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xianju Zhou,Shouchun Zhao,Jie Zhang,Guotao Xiang,Sha Jiang,Li Li,Yongjie Wang,Yanhong Li,Chuan Jing,Lu Yao,Hongmei Yang,Zhen Wang
As a new generation of luminous material , perovskite quantum dots (PQDs) possess many excellent properties. However, PQDs suffer from dramatic decrease of optical performance when affected by high temperature. In this paper, methamidine acetate (FA + ) and manganese divalent cation (Mn 2+ ) codoped CsPbCl 3 quantum dots (QDs) were synthesized. The introduced FA + and Mn 2+ were designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. By comparison with CsPbCl 3 :Mn 2+ QDs, the results show that the CsPbCl 3 :FA + ,Mn 2+ QDs improve the blue exciton luminescence by 15% and the red Mn 2+ ions luminescence by 37%. Furthermore, CsPbCl 3 :FA + ,Mn 2+ QDs demonstrate super thermal stability by maintaining 97% of Mn 2+ emission when the temperature is raised to 70 °C even after 6 thermal cycles. Simultaneously, the UV light and water stability of CsPbCl 3 :FA + ,Mn 2+ QDs have also been obviously enhanced. The powder of the coped PQDs have been fabricated into a white LED which exhibits Color Rendering Index (CRI) of 88.2 and Correlated Color Temperature (CCT) of 5745 K. It shows that CsPbCl 3 :FA + ,Mn 2+ QDs not only reduce the Pb 2+ ions toxicity problem but also boost the thermal stability and thermal cyclability, which may open up more possibilities for the applications in optoelectronic devices.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaobo Hu,Yanqiao Xu,Jiancheng Wang,Jiaxin Ma,Lianjun Wang,Wan Jiang
CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are emerging as promising candidates for fluorescence sensors due to their superior optoelectronic properties. However, the poor stability restricts their practical applications in aqueous fluorescent detection. Herein, we report in-situ encapsulation of CsPbX 3 NCs into uniform PVDF-HFP/PS polymer nanofibers with fine diameter of only 49.9 ± 2.2 nm by one-step electrospinning process. The as-fabricated CsPbX 3 @PVDF-HFP/PS nanofibers exhibit high photoluminescence quantum yield (PLQY) of 90%, tunable emission wavelength covering the whole visible range of 451.5–650.8 nm. Most importantly, the water stability of nanofiber membranes can be significantly improved by introducing the 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDTMS) as hydrophobic additives, in which their PL intensity can retain 88% initial value after water immersion for up to 100 days. The universality of this fabrication strategy for the stable nanofibers is demonstrated by utilizing different types of polymers and perfluorosilanes (PFSs). Taking advantage of excellent optical properties, fine diameter and high hydrophobicity of PFDTMS-modified CsPbBr 3 @PVDF-HFP/PS nanofibers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) in aqueous solution with maximum fluorescence resonance energy transfer (FRET) efficiency up to 80.9% and 69.7% are realized, respectively. Notably, these electrospun nanofiber membranes possess outstanding durability and recyclability, indicating their great potential in multifunctional photoelectric applications.
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Journal of Materiomics
·
2022
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IF 8.589
Gajula Prasad,Xiongwei Lin,Junwei Liang,Yingbang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
Intra porous fibrous membranes have enhanced metal ionic adsorption and oil separation abilities than those of intra nonporous fibrous membrane. In this paper, we prepared highly intra porous fibrous poly (vinylidene fluoride) (PVDF) membranes using an innovated water-mediated electrospinning approach. FTIR-ATR and XRD techniques confirmed the conversion of non-polar α - phase to polar β-phase in electrospun membranes. The porous fibrous membrane M–16 had adsorbed oil almost 120% and metal adsorption around 15%, 12%, 5%, 13% respectively for Pb 2+ , Cd 2+ , Cu 2+ and Zn 2+ , which are larger than the counterpart of nonporous M–18. The nonporous fibrous membranes have better peak to peak output voltage ( V p - V p ) 2 to 3 times than the porous fibrous membranes (M–16). The results show apparent potential applications in wastewater/oil spill treatment as well as piezoelectric sensors.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yanping Liu,Yan Zhan,Beata Szreniawa,Katarzyna Matras-Postolek,Ping Yang
Perovskite nanomaterials with highly stable and bright emission were requested for white light emitting diodes (LEDs). In this paper, superior thin CsPbBr 3 nanoplates (NPLs) with an average thickness of 1.9 nm were synthesized via solvothermal reactions. A bright blue-emitting peak at 455 nm with a photoluminescence (PL) quantum yield of 89 % was observed. The high PL efficiency was kept after storing for 90 days at ambient condition. This supplied an efficient approach to solve the problem of low PL efficiency and poor stability of blue-emitting perovskite nanocrystals . The thickness of CsPbBr 3 NPLs was adjusted by changing preparation conditions. The PL peak wavelength of CsPbBr 3 NPLs was adjusted in a region of 455–465 nm. Through dynamic anion exchange promoted cation exchange reactions, Mn ions were introduced in the lattice of CsPbBr 3 NPLs to generate bright orange emitting to create dual-luminescent CsPbBr 3 :Mn NPLs. A white emitting sample with a color coordinate of (0.304, 0.325) was finally fabricated using bright CsPbBr 3 :Mn NPLs and green-emitting CsPbBr 3 nanocrystals. This work broadened the application of perovskite for display and lighting.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiejun Ren,Xiaopeng Zhou,Yuhua Wang
Metal halide perovskite quantum dots (PQDs) are considered as promising candidate for the next generation optoelectronic applications. However, their development is severely restricted by their poor stability. Here, we demonstrate the in situ growth of PQDs in the ordered channels of functionalized covalent-organic frameworks (COFs). The strong S-Pb chemical binding firmly anchors the PQDs in COF matrix, which prevent the aggregation of PQDs and eliminate the nonradiative trap centers of PQDs, leading to the high photoluminescence quantum yield (81.5 %) and remarkable stability. Femtosecond transient absorption spectroscopy reveal the elimination of nonradiative trap centers in PQD@COFs. Theoretical simulation results demonstrate the strong waveguide effect in PQD@COFs, which reduces the reabsorption loss. Further, the obtained white light-emitting diode exhibits ultrahigh luminous efficiency of 89.6 lm/W and excellent operating stability, which paves the way for the commercial application of PQDs.
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