Nanomaterials
·
2022
·Vol. 12
·期 5
·728
·
IF 5.719
Wei Zhang,Yang Zang,Yanli Lu,Jinghui Han,Qingyun Xiong,Jinping Xiong
In this study. a novel near-infrared fluorescent-driven contrast agent (Ag-doped NaYF4:Yb3+/Er3+@NaYF4:Nd3+@NaGdF4) was synthesized using a coprecipitation-hydrothermal-solvothermal-solvothermal (CHSS) method. The results shows that hexagonal NaYF4:Yb3+/Er3+with a diameter of 300 nm was successfully synthesized by the CHSS method. The new contrast agent was characterized using scanning electron microscopy, fluorescence spectrometry, transmission electron microscopy, energy-dispersive spectrometry and ultraviolet-visible light diffuse reflectance absorption spectroscopy. Even at low concentrations (0.2 M), this proposed contrast agent can be excited by near-infrared light with a wavelength of 980 nm and emits a dazzling green light with a wavelength of 540 nm, and the comparison of the luminescence intensity proves that doping with silver increases the luminescence intensity of the upconverted nanomaterial by nearly 13 times based on the calculated quantum yield. TEM images show the successful preparation of silver nanoparticles with a diameter of 30 nm, and the energy spectrum shows the successful doping of silver nanoparticles and the successful preparation of the core-shell structure of NaYF4:Yb3+/Er3+@NaYF4:Nd3+@NaGdF4. Furthermore, the mechanism of the increased luminous intensity has been studied using simulation calculations. Finally, cytotoxicity tests were used to test material which was modified by 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[amino(polyethylene glycol)-2000] (DSPE-PEG2K), and the biocompatibility was significantly improved, meeting the standard for biological applications.Keywords:upconversion;near-infrared;intensity;in vivo imaging
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Advanced Science
·
2022
·Vol. 9
·期 7
·2103724
·
IF 17.521
Xingwen Cheng,Zhi Xie,Wei Zheng,Renfu Li,Zhonghua Deng,Datao Tu,Xiaoying Shang,Jin Xu,Zhongliang Gong,Xingjun Li,Xueyuan Chen
Fundamental understanding of the effect of doping on the optical properties of 3D double perovskites (DPs) especially the dynamics of self-trapped excitons (STEs) is of vital importance for their optoelectronic applications. Herein, a unique strategy via Cu + doping to achieve efficient STE emission in the alloyed lead-free Cs 2 (Ag/Na)InCl 6 DPs is reported. A small amount (1.0 mol%) of Cu + doping results in boosted STE emission in the crystals, with photoluminescence (PL) quantum yield increasing from 19.0% to 62.6% and excitation band shifting from 310 to 365 nm. Temperature-dependent PL and femtosecond transient absorption spectroscopies reveal that the remarkable PL enhancement originates from the increased radiative recombination rate and density of STEs, as a result of symmetry breakdown of the STE wavefunction at the octahedral Ag + site. These findings provide deep insights into the STE dynamics in Cu + -doped Cs 2 (Ag/Na)InCl 6 , thereby laying a foundation for the future design of new lead-free DPs with efficient STE emission.
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Materials
·
2022
·Vol. 15
·期 3
·914
·
IF 3.748
Jintao Wang,Xinjie Wang,Lin Zhang,Luobin Zhang,Fangcheng Duan,Fengyi Wang,Weiwei Zhang,Jianqiang Wang,Zheng Zhang,Chunjin Hang,Hongtao Chen
A 3–5 μm Cu@Sn core-shell powder was prepared by chemical plating. Based on the mixture of this Cu@Sn and Ag NPs (nanoparticles), a soldering material for third-generation semiconductors was prepared. The joints prepared with this soldering material had a shear strength of over 40 MPa at 25 °C. This joint did not fail after more than 600 thermal cycles from −40 °C to 140 °C. The special feature of this joint is that the energy potential difference between nanoparticles and micron particles generated in the surface force field during reflow promoted the surface pre-melting of the particles by releasing the excess energy. By this mechanism, it was possible to reduce the porosity of the sintered layer. At the same time, due to the high surface activity energy of nano-silver, the diffusion of the Sn atoms was promoted, further enhancing the bond strength.Keywords:TLP;Cu@Sn;integrated packaging;soldering
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Membranes
·
2023
·Vol. 13
·期 5
·530
·
IF 4.2
Lixin Xie,Yaqian Liu,Shichang Xu,Wen Zhang
The surface modification of reverse osmosis (RO) membranes to improve their anti-biofouling properties is gaining increased attention. Here, we modified the polyamide brackish water reverse osmosis (BWRO) membrane via the biomimetic co-deposition of catechol (CA)/tetraethylenepentamine (TEPA) and in situ growth of Ag nanoparticles. Ag ions were reduced into Ag nanoparticles (AgNPs) without extraneous reducing agents. The hydrophilic property of the membrane was improved, and the zeta potential was also increased after the deposition of poly (catechol/polyamine) and AgNPs. Compared with the original RO membrane, the optimized PCPA3-Ag10 membrane showed a slight reduction in water flux, and the salt rejection declined, but enhanced anti-adhesion and anti-bacterial activities were observed. TheFDRtof the PCPA3-Ag10 membranes during the filtration of BSA, SA and DTAB solution were 5.63 ± 0.09%, 18.34 ± 0.33% and 34.12 ± 0.15%, respectively, much better than those of the original membrane. Moreover, the PCPA3-Ag10 membrane exhibited a 100% reduction in the number of viable bacteria (B. subtilis and E. coli) inoculated on the membrane. The stability of the AgNPs was also high enough, and these results verify the effectiveness of poly (catechol/polyamine) and the AgNP-based modification strategy for the control of fouling.Keywords:RO membrane;anti-fouling;co-deposition;poly (catechol/polyamine);silver nanoparticles
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Tao Xu,Rongyan Wang,Chenjie Gu,Tao Jiang
Surface-enhanced Raman scattering (SERS) technology enables to satisfy the increasing demand of clinical drug monitoring due to the superiority of fingerprint recognition, real-time response, and nondestructive collection. Here, a novel graphitic carbon nitride (g-C 3 N 4 )/ molybdenum disulfide (MoS 2 )/Ag composite substrate with a 3D surface structure was successfully developed for the recyclable detection of gefitinib in serum. Attributed to the uniform and dense “hotspots” on the shrubby active surfaces in conjunction with the potential synergistic chemical enhancement of g-C 3 N 4 /MoS 2 heterosystem, a remarkable SERS sensitivity with an attractive enhancement factor value of 3.3 × 10 7 was demonstrated. Meanwhile, a type-II heterojunction between g-C 3 N 4 and MoS 2 enabled more efficient diffusion of photogenerated e − -h + pairs assisted by the localized surface plasmon resonance of Ag NPs, which contributed to the reliable recyclable detection of gefitinib. The ultra-low limit of detection at 10 −5 mg/mL and high recycling rates of gefitinib beyond 90% in serum were successfully realized. The results demonstrated the as-prepared SERS substrate has tremendous potential to be untilized for in-situ drug diagnostics.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jiaxin Meng,Senqing Fan,Zenghui Mai,Yangchao Liu,Haijie Qing,Mingxia Yang,Chuang Li,Zeyi Xiao
A hierarchically porous flow-through catalytic nanofiber membrane immobilized with Ag nanoparticles (Ag/HP-FCNM) has been developed by combining electrospinning and sacrificial template. The characterization results of Ag/HP-FCNM imply that mesopores with an average size of 50 nm are successfully fabricated on Polyacrylonitrile (PAN) nanofibers, and 6 nm of Ag nanoparticles are immobilized in the mesopores, effectively preventing the aggregation of Ag nanoparticles and increasing the surface area. The HP-FCNM with Ag nanoparticles content of 35.02% has a permeance of 18680 L·m −2 ·h −1 ·bar −1 can enhance the contact between catalyst and reactant. During the process of p -Nitrophenol ( p -NP) reduction by Ag/HP-FCNM under the flow-through mode, the apparent reaction rate constant ( K app ) of 272.45 min −1 , treatment capability of 200.34 mmol·m −2 ·h −1 and specific treatment capability of 14.27 mmol·g −1 ·h −1 can be achieved. Furthermore, good applicability of the Ag/HP-FCNM is also demonstrated with excellent conversions (both above 99%) when treating o -Nitrophenol ( o -NP) and Rhodamine B (RhB) at a concentration of 0.25 mM and a membrane flux of 192 L·m −2· h −1 . Good stability can be still performed after 160 min of continuous use, which implies the prospect of the Ag/HP-FCNM.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2023
·Vol. 25
·期 19
·13474-13486
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IF 3.3
Xin Guan,Xiao-li Wang,Xue-wen Zhu,Hui Yu,Ming Yang,Xiang-ting Dong,Ying Yang,Long Xia
β-Bi2O3 demonstrates excellent photocatalytic activity under visible light, but it has a very high photogenerated e−–h+ recombination rate and quite low quantum efficiency. AgBr also shows excellent catalytic activity but Ag+ is easily reduced to Ag under light radiation, which limits its application in the photocatalysis field, and there are few reports about the application of AgBr in photocatalysis. In this study, the spherical flower-like porous β-Bi2O3 matrix was first obtained, and then the spherical-like AgBr was embedded between the petals of the flower-like structure to avoid direct light radiation. The only light through the pores on the β-Bi2O3 petals could be transmitted onto the surfaces of AgBr particles to form a nanometer point light source, which photo-reduced Ag+ on the surface of the AgBr nanospheres to construct the Ag-modified AgBr/β-Bi2O3 embedded composite and a typical Z-scheme heterojunction was constructed. Under this bifunctional photocatalyst and visible light, the RhB degradation rate reached 99.85% in 30 min, and the photolysis water hydrogen production rate reached 6.288 mmol g−1 h−1. This work is as an effective method for not only the preparation of the embedded structure, quantum dot modification and flower-like morphology but also for the construction of Z-scheme heterostructures.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 7
·1481-1492
·
IF 1.8
Jia-Rong Xue,Rong-Chao Xue,Pei-Yao Chen,Yong Wang,Li-Ping Yu
In this study, a hydrostable Z-scheme Ag/CsPbBr 3 /Bi 2 WO 6 photocatalyst was designed and fabricated for the degradation of Rhodamine B (RhB). The structural instability of CsPbX 3 perovskites in water is one of the main obstacles that restrict their practical application in photocatalytic wastewater treatment. The photocatalyst was prepared in three steps: passivation of CsPbBr 3 nanocrystals (NCs) with 3-mercaptopropionic acid (MPA), construction of a heterojunction between MPA-passivated CsPbBr 3 NCs and Bi 2 WO 6 ultrathin nanosheets, and doping Ag nanoparticles as charge mediators in the heterojunction. The as-obtained 5%Ag/20%CsPbBr 3 /Bi 2 WO 6 exhibits good stability and excellent photocatalytic activity. The degradation rate is 93.9% in 120 min, which is 4.41 times than that of Bi 2 WO 6 .
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Crystals
·
2021
·Vol. 11
·期 12
·1573
·
IF 2.589
Xiaoqing Si,Xiaoyang Wang,Chun Li,Tong Lin,Junlei Qi,Jian Cao
Reactive air brazing has been widely used in fabricating solid oxide fuel/electrolysis cell (SOFC/SOEC) stacks. However, the conventional Ag–CuO braze can lead to (I) over oxidation at the steel interconnect interface caused by its adverse reactions with the CuO and (II) many voids caused by the hydrogen-induced decomposition of CuO. The present work demonstrates that the Ag particle interlayer can be used to join yttria-stabilized zirconia (YSZ) electrolytes to AISI 441 interconnect in air instead of Ag–CuO braze. Reliable joining between YSZ and AISI 441 can be realized at 920 °C. A dense and thin oxide layer (~2 μm) is formed at the AISI 441 interface. Additionally, an interatomic joining at the YSZ/Ag interface was observed by TEM. Obtained joints displayed a shear strength of ~86.1 MPa, 161% higher than that of the joints brazed by Ag–CuO braze (~33 MPa). After aging in reducing and oxidizing atmospheres (800 °C/300 h), joints remained tight and dense, indicating a better aging performance. This technique eliminates the CuO-induced issues, which may extend lifetimes for SOFC/SOEC stacks and other ceramic/metal joining applications.Keywords:solid oxide fuel/electrolysis cells;sintering;YSZ;Ag particle interlayer;aging
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Chunwen Chang,Qun Wang,Qiang Xue,Fei Liu,Lili Hou,Shengyan Pu
Chloramphenicol (CAP) is a typical broad-spectrum antibiotic, which is still frequently detected in various water environments. In this work, a novel electrochemical sensor was developed to detect CAP in water environment by loading TiO 2 modified with sodium carboxymethyl cellulose (CMC) and silver nanoparticles (AgNPs) onto the laser-induced graphene (LIG). The Ag/CMC@TiO 2 /LIG electrode was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and contact angle (CA) analysis. The mechanism of the enhancement of electrochemical signal is that the dispersion of CMC promotes the synergistic catalysis of AgNPs and TiO 2 NPs. The electrochemical properties of the Ag/CMC@TiO 2 /LIG electrode were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The Ag/CMC@TiO 2 / LIG electrode shows a low CAP detection limit of 0.007 μM and a linear response in the range of 0.01 to 100 μM. The sensor has been successfully applied to the detection of CAP in tap water and lake water with recoveries of 93.60% to 105.70% and relative standard deviations of less than 2.08%. These results provide new insights on using carbon based electrochemical sensor for rapid detection of CAP in water environment.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yanting Liu,Yanzhu Wang,Lili Meng,Qi Pang,Hua Yao,Qian Chen,Sidi Ye,Yanting Li,Minyi Zheng
Herein, we successfully obtained Ho 3+ and Ag + -codoped Cs 2 NaBiCl 6 halide double perovskites (DPs) via a hydrothermal method , which exhibit orange-red broadband self-trapped excitons (STE) emission and visible (Vis) and near-infrared (NIR) narrow band emission attributed to Ho 3+ f-f transition, under 360 nm excitation. Compared to the single Ho 3+ -doped sample, the Vis PL intensity of the codoped sample was increased by nearly 13.8 times, and an enhanced photoluminescence quantum yield (PLQY) of 87.45 % was achieved. The PL enhancement is attributed to the partial substituting of Na + with Ag + , leading to an efficient STE emission, and the more energy transition from STE to Ho 3+ . Moreover, the synthesized phosphor exhibits good stability in thermal and atmospheric environments. White light-emitting diode (WLED) is fabricated by employing Cs 2 Na 0·997 Ag 0·003 Bi 0.935 Ho 0.065 Cl 6 on near-ultraviolet (n-UV) LED chips, achieving a color rendering index (CRI) of 95.0 and correlated color temperature (CCT) of 3814 K. Anti-counterfeit patterns and the application for night vision monitoring were also discussed. This study inspires the designing of high-quality phosphors of rare earth-doped DPs and expands the multi-domain luminescence applications of halide DPs.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2026
·
IF 5.1
Lulu Wang,Hui Wang,Mingyang Wang,Bokun Chang,Haojie Gao,Shihui Yu
Ultra-stable, transparent, skin-conformable SnO₂@Ag NWs temperature sensors. • Sensors show a working range (30–130°C) and high sensitivity (TCR=0.31%°C⁻¹). • Excellent stability under chemical corrosion, 300 thermal cycles, and 3000 bends. • Sensors exhibit rapid response (1.5 s) and recovery (1.2 s). • Applied for monitoring human skin temperature and respiratory status. Skin-conformable temperature sensors with high stability and sensitivity are essential for electronic skin and real-time health monitoring. However, achieving high stability while preserving sensitivity and a broad linear working range remains a challenge. Herein, we report a novel, highly stable resistive temperature sensor based on an all-solution-processed SnO₂@Ag core-shell nanowire composite, embedded in an ultrathin polyvinylidene fluoride (PVDF) substrate (~5.1 μm) via laser direct writing. The conformal SnO₂ shell (~2 nm) protects Ag NWs from degradation without compromising conductivity and transparency. The resulting sensor exhibits high optical transparency (89.5% at 550 nm), a linear temperature sensing range of 30–130 °C, a temperature coefficient of resistance (TCR) of 0.31% °C⁻¹ , and a temperature resolution of 0.5 °C. Notably, the sensor demonstrates stable resistance after 300 thermal cycles (30–80 °C) and 3000 bending cycles, with a maximum hysteresis error of 1.73% over the full range, highlighting its mechanical and thermal robustness. Furthermore, the core-shell structure imparts robust resistance to moisture, oxidants, and salt solutions, ensuring reliable operation in harsh environments. As a proof-of-concept, the sensor enables precise, skin-conformal measurement of human body temperature, and offers a rapid response/recovery time of 1.5 s/1.2 s for respiratory pattern monitoring, showing its significant potential for electronic skin applications. Download: Download high-res image (153KB) Download: Download full-size image
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