JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Xia Qiu,Ling Wang,Yinggui Zhu
A novel electrochemiluminescence (ECL) system consisting of Eosin B (EB) and K 2 S 2 O 8 was studied and found to generate ECL following the oxidation or reduction of Eosin B and K 2 S 2 O 8 . The type of buffer solution, type of co-reactant, pH value, and K 2 S 2 O 8 concentration were optimized through experiments to make the reaction system reach the best value. In addition, we found that Cr 3+ has a great quenching effect on the EB reaction system. Through the comparison of ECL and CV under different conditions, DPV curve, UV spectrum and ECL spectrum experiments, we focused on the quenching mechanism of Cr 3+ on the system and made reasonable guesses. This method demonstrates the potential application value of ECL in the field of environmental monitoring and reveals the potential value of organic molecular ECL luminophores.
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高影响因子
Magnetochemistry
·
2023
·Vol. 9
·期 7
·181
·
IF 2.7
Xiaogang Yu,Renpeng Yang,Chengwei Wu,Bo Liu,Wei Zhang
Zn0.6Mg0.4CrxFe2−xO4(0 ≤ x ≤ 0.4) nanoparticles were synthesized using a hydrothermal technique. The obtained magnetic nanoparticles (MNPs) exhibited a spinel structure, where the lattice constant decreased with the Cr3+ion content. The doping of Cr3+ion (x = 0.1) increased the specific saturation magnetization to 46.4 emu/g but decreased to 20.0 emu/g with the further increase in the Cr3+ion content to x = 0.4. The decrement in Curie temperature was ascribed to the weakened super-exchange interaction between the metal ions located atA-sites andB-sites, which arose from the doping of the Cr3+ion. The T2-weighted images gradually darkened with the increase in Zn0.6Mg0.4Cr0.1Fe1.9O4nanoparticles concentration, suggesting that the nanoparticles can enhance the image contrast. Zn0.6Mg0.4CrxFe2−xO4(0 ≤ x ≤ 0.4) nanoparticles were able to heat the agar phantom to the hyperthermia temperature under the safe alternating magnetic field, which showed their potential in the magnetic induction hyperthermia.Keywords:magnetic nanoparticles;Curie temperature;hyperthermia
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Journal of Environmental Chemical Engineering
·
2018
·
IF 0
Zhejian Wu,Rong Chen,Qimao Gan,Jian Li,Tuqiao Zhang,Miaomiao Ye
Mesoporous Na + SiO 2 spheres with large surface areas, high porosities and tunable Na + contents have been synthesized by the Stöber method followed by the “polyvinylpyrrolidone (PVP)-protected NaOH etching” process. With the surface protection of PVP, the NaOH etching preferentially occurs inside the SiO 2 spheres results in the increase of the surface areas and porosities of the SiO 2 spheres while keeping the sphere size unchanged at the etching degree less than 50%. The surface area and pore volume of the selected Na + SiO 2 spheres with etching degree of 50% are 302.9 m 2 /g and 0.946 cm 3 /g, respectively, which are 31 times and 59 times higher than that of the SiO 2 spheres without NaOH etching. The Na + SiO 2 spheres with etching degree of 10% calcined at 400 °C shows high adsorption activity for Cr 3+ removal from different natural waters such as tap water, lake water and river water. The adsorption kinetic of Cr 3+ by the Na + SiO 2 spheres fits well with the pseudo-second-order model, and the adsorption isotherm can be fitted by the Langmuir adsorption isotherm. The maximum adsorption capacity of 10% Na + SiO 2 400 for Cr 3+ is 33.18 mg/g. Finally, it has been confirmed that the ion-exchange between Na + and Cr 3+ plays the leading role in the adsorption process while the contribution from static adsorption is relatively weak.
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Analytical Methods
·
2012
·Vol. 4
·期 5
·1259-1264
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IF 1.547
Junwei Xin,Lijing Miao,Shougang Chen,Aiguo Wu
A sensitive and selective colorimetric assay method for the detection of Cr3+ has been developed using tripolyphosphate functionalized gold nanoparticles (P3O105−–AuNPs). Infrared (IR) spectra and energy dispersive X-ray spectroscopy (EDS) confirmed that tripolyphosphates capped on the surfaces of gold nanoparticles (AuNPs). Gold nanoparticles were prepared by reducing HAuCl4 with sodium borohydride (NaBH4) in the presence of sodium tripolyphosphate (Na5P3O10). Upon exposure to Cr3+, the color of the gold nanoparticle solution changed from red to violet, which was in response to the surface plasmon absorption of dispersed and aggregated nanoparticles. The P3O105−–AuNPs were bound by Cr3+ and showed excellent selectivity compared to other ions (Hg2+, Fe3+, Cr6+, Mn2+, Cd2+, Ni2+, Pb2+, Ba2+, Co2+, Cu2+, Ca2+, Mg2+, Zn2+, Al3+, Na+, Cl−, SO42−, PO43−, CO32−, NO3−, and all of the above interfering ions with the exception of Cr3+) and had a detection limit of 10−7 M by the naked eye in this way. Most importantly, the P3O105−–AuNPs can be stored at room temperature over half a year. In addition, the P3O105−–AuNPs were also used to detect Cr3+ in real environmental water samples, with low interference.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lanjiao Li,Ying Chen,Rongfei Wei,Siyu Guo,Xiangling Tian,Fangfang Hu,Hai Guo
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are playing an increasingly important role in the spectroscopy technology fields. Developing high-performance NIR-emitting phosphors is of immense significance for advancing NIR pc-LEDs. Herein, the approach of cationic substitution of Ca 2+ by Mg 2+ was designed in Ca 4 ZrGe 3 O 12 :Cr 3+ . Remarkably enhanced NIR emission and strikingly improved thermal stability are realized. The luminescence intensity at 423 K compared with that of room temperature ascends from 45.67 % to 72.81 %. Moreover, the representative sample was assembled to a NIR pc-LED with favorable output power and photoelectric conversion efficiency by combining a commercial 470 nm blue chip. The packaged LED demonstrates the feasibility of practical applications in night vision, biological imaging, and fruit detection. The above findings verify the potential prospect of Ca 4- x Mg x ZrGe 3 O 12 :Cr 3+ phosphor for the utilizations in NIR light sources.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jing Ren,Fengmei Zhu,Yuan Gao,Jianbei Qiu
Broadband near-infrared (NIR) light sources cover unique optical wavelengths and are valuable in the fields of bioimaging and photodynamic therapy, night vision lighting and security monitoring. NIR phosphor converted light-emitting diode (NIR pc-LED) devices have attractive features such as tunable emission peak, low cost of production, compact in sizes and high luminous efficiency. However, heat accumulation during operation due to poor thermal conductivity of the organic resin used in packaging often causes serious reduction in luminous efficiency and accelerated degradation of the device. In present work, we developed a Cr 3+ -doped transparent CaF 2 -based oxy-fluoride glass-ceramic (GC) that showed a broadband emission of 700∼1400 nm under 470 nm excitation. The emission peaked at ∼880 nm, the full-width at half maximum was about ∼297 nm, and the photoluminescence quantum yield reached ∼31.19 %. The emission was derived from the electronic transition of Cr 3+ ions from the 4 T 2 (F) to 4 A 2 (F). Through structural analysis and numerical simulation, we showed that during the heat treatment process, Cr 3+ ions were enriched into the CaF 2 crystal phase and replaced the Ca 2+ in the GC host with occupied the center position of the polyhedrons, which provided a weak crystal field and led to NIR emission. We built NIR pc-LED devices using optimized GC and commercial blue LED chips, and we demonstrated the application of this NIR pc-LED in night-vision lighting. Our approaches to prepare simple and stable inorganic NIR luminous materials sealed in bulk in a transparent CaF 2 -based oxy-fluoride GC and to construct pc-LED devices could provide new concept to the field and have practical implications to applications in related fields.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Kechen Zhang,Haojing Xu,Yuhe Shao,Zaisheng Wen,Ting Wang,Mingyue Chen,Zhen Song,Quanlin Liu
Achieving excitation-free, long-range target surveillance under complete darkness remains a critical challenge for night-vision technology. Here, a breakthrough is reported in near-infrared (NIR) persistent luminescence (PersL) materials designed specifically for this frontier. Through strategic bandgap engineering via Sm 3 ⁺ co-doping and In 3 ⁺ solid-solution incorporation in the novel Cr 3 ⁺-doped Mg 3 Ga 1.9 In 0.1 SnO 8 spinel phosphor, the afterglow intensity and duration are dramatically enhanced. The optimized material exhibits an ultra-long NIR PersL exceeding 168 h. Crucially, PDMS films embedded with this phosphor enabled real-time, persistent target detection at an unprecedented distance of 47.5 m in complete darkness, entirely without any external excitation source. This record-setting long-range performance demonstrates the material's potential as an enabling technology for passive, long-range nighttime surveillance systems. Comprehensive spectroscopic studies elucidate the underlying PersL mechanism. This work establishes a new pathway for designing ultra-long NIR PersL materials and paves the way for advanced applications in remote night-vision technologies.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xuesong Wang,Yao Xiao,Puxian Xiong,Pan Zheng,Shengbing Xu,Wenzhao He,Haiqiang Fang,Pengzhe Wang,Jiayi Yu,Sheng Wu,Qi Qian
Mechanoluminescence (ML) materials can directly convert mechanical energy into light energy, demonstrating significant application potential in various fields. However, the limited spectral range of ML materials has hindered the application in complex environments such as biological stress detection and water quality monitoring. Here, we reported the Cr 3+ -activated high-perfromance NIR ML with continuous spectral tuning from a sharp R line (698 nm) to a broadband range (650–1000 nm) based on local crystal field engineering. Comprehensive characterizations (Raman, TEM, XPS and EPR) revealed the potential origin of ML, addressing synergistic effects of Cr 3+ -induced lattice distortion and oxygen vacancy defects. Lattice distortion breaks the central symmetry to induce the piezoelectric effect, driving carrier migration to Cr 3+ ion, in which oxygen vacancy provides a fast channel for carrier migration. Based on continuous NIR-ML spectral tunability, a novel water quality monitoring technology is demonstrated. The narrow band emission is used to detect sulfonated phthalocyanine cobalt, while broadband emission is used to detect carbon black. This work provides novel insights into the design of spectrally tunable NIR-ML materials and their application in real-time monitoring of water quality.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Ziyang Wu,Changheng Chen,Jinmeng Xiang,Jiwen Chang,Xiaoqi Zhao,Chongfeng Guo
The portable near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) with a broad spectrum have great application potential in information encryption, infrared night vision, medical imaging, chemical component detection, nondestructive testing, and many other fields, in which stable and efficient ultrawide NIR-emitting phosphors have become a new pursuit. However, the low luminescence intensity and narrowband emission of most NIR phosphors limit their potential applications. Under this drive, a NIR-emitting phosphor, Li2MgTi2.99O8:0.01Cr3+ (LMT:0.01Cr3+), with TiO6 and MgO6 octahedral sites for Cr3+, was developed. It exhibits 79.28% internal quantum efficiency (IQE) and a 155 nm full width at half maximum (fwhm) in the range of 600∼1300 nm. Based on the weakened crystal field strength through the [In3+-In3+] unit to cosubstitute the [Ti4+-Mg2+] unit, the emission peak red-shifted from 751 to 772 nm, with the fwhm widening to 205 nm in Li2Mg0.98In0.04Ti2.97O8:0.01Cr3+phosphors (LMIT:0.01Cr3+). The IQE was also further enhanced to 85.02% by substituting Mg2+ in LMIT:0.01Cr3+ with Zn2+, increasing the index of lattice distortion at the luminescence center to get Li2Mg0.92In0.04Zn0.06Ti2.97O8:0.01Cr3+ (LMIZT:0.01Cr3+). NIR pc-LED devices were fabricated by combining LMIZT:0.01Cr3+ phosphor with a blue LED chip, and their potential applications were also evaluated, showing excellent prospects in NIR penetration imaging and information encryption.
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PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 9
·1946
·
IF 3.1
Jing Bao,Yongjun Feng,Yong Pan,Juncheng Jiang
In this paper, two flower-like magnesium silicate nanomaterials were prepared. These and another two commercial magnesium silicate materials were characterized using a scanning electron microscope, the N2adsorption–desorption method, and other methods. The structure–activity relationship between the adsorption performance of these four magnesium silicate materials and their specific surface area, pore size distribution, and pore structure was compared. The results showed that the 3-FMS modified by sodium dodecyl sulfonate (SDS) had the largest specific surface area and pore size, the best adsorption performance, and the largest experimental equilibrium adsorption capacity (qe,exp) for Co2+, reaching 190.01 mg/g, and Cr3+, reaching 208.89 mg/g. The adsorption behavior of the four materials for Co2+and Cr3+both fitted the pseudo-second-order kinetic model and Langmuir adsorption model, indicating that chemical monolayer uniform adsorption was the dominant adsorption process. Among them, the theoretical adsorption capacity (qm) of 3-FMS was the highest, reaching 207.62 mg/g for Co2+and 230.85 mg/g for Cr3+. Through further research, it was found that the four materials mainly removed Co2+and Cr3+through electrostatic adsorption, surface metal ions (Mg2+), and acidic groups (-OH and -SO3H) exchanging with ions in solution. The adsorption performance of two self-made flower-like magnesium silicate materials for Co2+and Cr3+was superior to that of two commercial magnesium silicates.
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PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xinyu Fu,Huwei Li,Hongxia Yue,Zheyu Li,Jing Feng,Hongjie Zhang
Near-infrared (NIR) light-emitting diodes (LEDs) are potential devices that could become the core components in biological imaging, security monitoring, etc., which are currently constrained by suboptimal luminous efficiency due to the absence of excellent luminescent materials. Here, we report a double perovskite Cs2NaInCl6 that is suitable for Cr3+ doping and exhibits broad NIR emission. Through direct absorption and energy transfer (ET) from the self-trapped excitons (STEs) induced in the Cs2NaInCl6 matrix, Cr3+ can be excited to 4T1(P), 4T1(F), and 4T2(F) levels. Then, the broad emission with a full width at half-maximum (FWHM) of ∼150 nm, spanning 800 to 1300 nm, and a high photoluminescence quantum yield (PLQY) of up to 70% can be realized, resulting from the 4T2→4A2 transition of Cr3+. Subsequently, the introduction of Yb3+ endows Cs2NaInCl6:Cr3+,Yb3+ with a higher PLQY of 76% at the optimal doping ratio than Cs2NaInCl6:Cr3+. Ultimately, a miniaturized NIR LED device packaged based on Cs2NaInCl6:15%Cr3+,15%Yb3+ has been fabricated, which demonstrates superior performance for night vision, traceless perspective detection, and biological imaging. This work not only screens out a suitable Cs2NaInCl6 matrix for Cr3+ doping with high PLQY but also promotes its luminescence performance through Yb3+ doping for NIR LED applications.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 17
·24164-24170
·
IF 5.6
Rong-Rong He,Qiang-Qiang Zhu,Gan-Yu Cai,Ze-Tao Shen,Yue Zhai,Yu-Bin Kang,Le Wang
LED-based near-infrared (NIR) light sources are of considerable interest for advanced NIR spectroscopy technologies. However, LED "efficiency droop" presents a major challenge to achieving high-brightness NIR light. In this study, LaMgGa 11 O 19 :Cr 3+ (LMG:Cr 3+ ) ceramic was developed as a NIR color converter to achieve high-brightness laser-driven NIR light. The effects of fabrication temperature and Cr 3+ doping concentration on the luminescent properties of LMG:Cr 3+ ceramics were thoroughly investigated. Under blue light excitation, LMG:Cr 3+ ceramic exhibits a broadband NIR emission peak at 730 nm, with a high external quantum efficiency of 55.4 %. Due to its excellent heat dissipation performance and high-temperature stability, LMG:Cr 3+ ceramic can generate high-brightness NIR light, achieving an output power of 1.2 W when excited by a blue laser with power density of 7.50 W mm −2 . Finally, a laser-driven NIR light source has been successfully packaged, demonstrating the capability to meet various intelligent spectroscopy applications in biomedical imaging and non-destructive detection.
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