Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Qian Wen Cao,Yi Fan Zheng,Xu Chun Song
The efficient visible-light-driven AgIO 3 /AgBr photocatalyst was successfully synthesized by an in-situ anion-exchange method at room temperature. The scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflection spectroscopy (DRS) were used to characterize the obtained samples. The photocatalytic activities of the as-prepared heterojunctions were estimated by decomposing the organic dye RhB under visible-light irradiation ( λ > 420 nm). Compared with pure AgBr and AgIO 3 , the AgIO 3 /AgBr compounds showed dramatically improved visible-light photocatalytic activity. Besides, the results also revealed that 20% AgIO 3 /AgBr exhibited the best photocatalytic activity, which could decompose the RhB completely in 24 min. The enhanced photocatalytic activity of the composites could be ascribed to the high separation rate of the photoinduced electron–hole pairs in the heterojunction structure. Moreover, the radical trap experiments were also carried out which confirmed that h + played the major role in RhB photodegradation . The possible mechanism of RhB degradation on the AgIO 3 /AgBr composite was also discussed according to the results of the experiments and the performance of the obtained photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2017
·Vol. 69
·期 11
·1411-1420
·
IF 1.258
Ding Ming-Yue,Meng De-Shui,Tang Yan-Hong,Liu Cheng-Bin,Luo Sheng-Lian
One-dimensional (1D) Ag/AgBr/TiO 2 nanofibres (NFs) have been successfully fabricated by the one-pot electrospinning method. In comparison with bare TiO 2 NFs and Ag/AgBr/PVP (polyvinylpyrrolidone) NFs, the 1D Ag/AgBr/TiO 2 NFs photocatalyst exhibits much higher photocatalytic activity in the degradation of a commonly used dye, methylene blue (MB), under visible light. The photocatalytic removal efficiency of MB over Ag/AgBr/TiO 2 NFs achieves almost 100 % in 20 min. The photocatalytic reaction follows the first-order kinetics and the rate constant ( k ) for the degradation of MB by Ag/AgBr/TiO 2 NFs is 5.2 times and 6.6 times that of Ag/AgBr/PVP NFs and TiO 2 NFs, respectively. The enhanced photocatalytic activity is ascribed to the stronger visible light absorption, more effective separation of photogenerated electron-hole pairs, and faster charge transfer in the long nanofibrous structure. The Ag/AgBr/TiO 2 NFs maintain a highly stable photocatalytic activity due to its good structural stability and the self-stability system of Ag/AgBr. The mechanisms for photocatalysis associated with Ag/AgBr/TiO 2 NFs are proposed. The degradation of MB in the presence of scavengers reveals that h + and • O
− 2
significantly contribute to the degradation of MB.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhuanni Yu,Mengmeng Xu,Qiang Wang,Xiaowei Sun,Jing Lan
An efficient semiconductor composite, silver/silver orthophosphate/silver bromide, was successfully synthesized by a facile one-step reduction and ion exchange process. Its crystal structure, morphology, optical property, surface element composition were characterized by X-ray diffraction, scanning electron microscopy, ultraviolet-visible diffuse reflectance spectrometer and X-ray photoelectron spectrometer. The effects of composite proportion and synthesis duration on performances of as-prepared photocatalysts were investigated, and the results showed that Br/P molar ratio of 3 and the synthesis duration of 4 h were the optimum conditions. The radical scavenging experiments indicated that the hole and superoxide radical were the main active species in this reaction system. The Ag/Ag 3 PO 4 /AgBr-3 presented excellent stability and recyclability, maintaining 92% of degradation efficiency after 5 cycles. The good photocatalysis performance could be attributed to the formation of the heterojunction between Ag and Ag 3 PO 4 /AgBr.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jinhang Yang,Jiangli Sun,Shuo Chen,Danquan Lan,Zhihong Li,Zuji Li,Jingwen Wei,Zebin Yu,Hongxiang Zhu,Shuangfei Wang,Yanping Hou
Development of efficient and stable photocatalysts is of essential for photocatalytic degradation of refractory organics in wastewaters. Herein, the novel S-scheme MoSe 2 /AgBr (MS/AB) heterojunctions were synthesized for antibiotics degradation. Various characterization results showed that the S-scheme MS/AB photocatalysts exhibited efficient carriers’ separation and strong redox potential. Tetracycline (TC) (20 mg/L) degradation efficiency of 81.4% was achieved using the 5MS/AB within 90 min at pH of 9, superior to those of the counterparts. Photogenerated carriers' transfer and photocatalytic reaction mechanism of the S-scheme MoSe 2 /AgBr heterojunction were deduced by DFT calculation, in-situ XPS and work function calculation. Moreover, possible degradation pathways of TC were proposed based on identified intermediates, and most of the intermediates showed lower toxicity than that of TC. The 5MS/AB photocatalyst also showed great stability and excellent antibacterial effect. This study advances the design of efficient photocatalysts and enriches related mechanisms.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 15
·3490-3504
·
IF 4.495
Shanshan Ding,Mengshu Han,Yuxuan Dai,Shaogui Yang,Danjun Mao,Huan He,Cheng Sun
Graphical Next level silver : The novel plasmonic heterojunction photocatalysts of Ag/AgBr/Bi 4 O 5 Br 2 layered microspheres (AAB-LMs) were successfully synthesized by the in-situ deposition and visible-light photoreduction approach. They performed elevated photocatalytic activities towards the degradation of acid orange II and aniline under visible-light irradiation than Bi-O-Br and Ag/AgBr, which was mainly credited to the surface plasmon resonance (SPR) effect of Ag nanoparticles and the synthetic interaction among Ag, AgBr and Bi 4 O 5 Br 2 The novel photocatalysts of Ag/AgBr/Bi 4 O 5 Br 2 layered microspheres (AAB-LMs) were firstly constructed via the in-situ deposition and visible-light photoreduction approach. Their compositions, structures, morphologies and optical properties were characterized by various techniques. The photocatalytic efficiencies of AAB-LMs-10 were 28 and 3.4 times higher than those of Bi 4 O 5 Br 2 -LMs towards degrading acid orange II and aniline, respectively. The superior photocatalytic behavior of AAB-LMs benefited from efficient separation and transfer of photo-generated charges, which was mainly credited to the surface plasmon resonance effect of Ag nanoparticles and the synthetic interaction among Ag, AgBr and Bi 4 O 5 Br 2 . O 2 − and h + were characterized as the predominant photoactive species in this AAB-LMs-photocatalysis system. Moreover, due to the presence of radical species Br 0 , which was verified by the detection of bromoaniline and dibromoaniline during the photocatalytic degradation process of aniline, Z-scheme mechanism rather than the conventional heterojunction mode was more suitable to explain the enhanced photocatalytic performance of AAB-LMs.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 11
·4847-4854
·
IF 5.968
Desong Wang,Yandong Duan,Qingzhi Luo,Xueyan Li,Jing An,Leilei Bao,Lei Shi
A new method for the preparation of mesoporous TiO2 with a surface deposited with nanoparticles of Ag and AgBr was developed. Cetyltrimethylammonium bromide (CTAB) was used as both a template agent and bromine source in the preparation process of the mesoporous TiO2. Mesoporous TiO2 containing CTAB was synthesized by a sol–gel method, and was dipped into AgNO3 solution to form a mesoporous AgBr/TiO2 nanocomposite. The AgBr/TiO2 nanocomposite was irradiated by visible light to accelerate photolysis of AgBr, forming mesoporous Ag/AgBr/TiO2 photocatalyst. The Ag/AgBr/TiO2 photocatalyst was characterized by small angle X-ray diffraction (SAXRD), wide angle X-ray diffraction (WAXRD), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES) and N2 isothermal adsorption–desorption. Ag/AgBr/TiO2 exhibits high photocatalytic activity for the degradation of methyl orange under visible light irradiation. The photocatalytic reaction follows the first-order kinetics and the rate constant (k) for the degradation of methyl orange photocatalyzed by Ag/AgBr/TiO2 is 63.6, 36.1 and 2.7 times that of mesoporous TiO2 (M-TiO2), commercial TiO2 (P-25), and Ag/AgBr/SiO2, respectively. The recycling runs experiment shows that the photocatalytic stability of the Ag/AgBr/TiO2 photocatalyst is excellent. The visible light photocatalytic mechanism of Ag/AgBr/TiO2 is also discussed.
研究领域:
材料科学
·
光催化化学
·
纳米材料
·
环境功能材料
·
表面科学
✓ 已验证
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Yongfeng Gao,Yuanhui Feng,Lu Zhou,Lucia Petti,Zhe Wang,Jun Zhou,Shusen Xie,Jian Chen,Yanping Qing
Ultrasensitive detection of alpha-fetoprotein (AFP) is critical for the early diagnosis of liver cancer. In this work, a novel surface-enhanced Raman scattering (SERS)-based immunoassay complex has been successfully developed for the detection of AFP by using the Au-Ag alloy nanoparticals and the Ag/AgBr hybrid nanostructure. As the typical bimetal or metal/semiconductor plasmonic materials, besides the strong SERS enhancement characteristics, the Au-Ag alloy nanoparticals exhibit excellent monodispersity and the Ag/AgBr hybrid nanostructure demonstrates good stability. The experimental results show that the SERS-based immunoassay of AFP presents a low limit of detection of 1.86 fg/mL and a broad dynamic range from 2 fg/mL to 0.8 μ g/mL. Furthermore, the clinical applicability of the proposed SERS-based immunoassay has been assessed by the detection of AFP in the human serum samples of cancer patient and healthy person. The test data are consistent well with that of chemiluminescence immunoassay (CLIA) in the relative errors of − 8.82–8.06% and show better detection sensitivity. It reveals that the proposed immunoassay protocol is significant for giving insight into the design of ultrasensitive biosensor and the point-of-care testing of cancers.
研究领域:
分析化学
·
生物医学工程
·
纳米技术
·
癌症研究
·
临床诊断
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Ziyi Liu,Xin Wang,Wei Lei
Lead halide perovskite single crystals (LHPSCs), leveraging their high atomic number, excellent carrier transport properties, and tunable bandgap, demonstrate unique potential in gamma spectroscopy detection. Among kinds of LHPSCs, MAPbBr3 (MA=CH3NH3) is the easiest to grow from solution with centimeter-scale size. Existing devices suffer from large noise at high bias or low collection efficiency at low bias. Our work aims to address this trade-off, designing a gamma spectroscopy detector that achieves high charges collection efficiency and low noise under high bias. This study proposes a structure of p-MAPbBr₃/i-MAPbBr₃/n-MAPbBr₃ PIN photodiode via heterovalent metal cooperation and epitaxial growth. By constructing such a homojunction PIN structure, defects near the interface were significantly suppressed Under zero bias, the widths of the depletion layers for N-I and I-P reach 1.04 μm and 0.94 μm, respectively, demonstrating the effective growth of a PIN junction. Consequently, the noise is only 4.2×103 electrons at 2400 V cm⁻¹, the mobility-lifetime product is 3.44×10-3 cm2V-1, thus significantly improving the carrier collection efficiency of over 80%. Experimental results reveal outstanding performance in detecting 662 keV gamma-ray photons, achieving an exceptional energy resolution of 3.5% under an electrical field of 2400 V cm-1. This work provides useful information for the fabrication of perovskite-based gamma-ray detectors.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Shu-Yue Xie,Ming-Hui Liu,Ning Wang,Xi-Meng Zhang,Shen-Hao Wang,Yan Yang,Jun Li,Bo Zhang
Constructions of new haloargentate hybrids with semiconductor natures and photoelectric performances remain very fascinating yet challenging. In this paper, using in situ-generated [Co(2,2-bipy)3]2+ and [Ni(2,2-bipy)3]2+ metal-complex cations as the structure-directing agents, we successfully fabricated two new numbers of haloargentate family, namely [NH4][Co(2,2-bipy)3]2Ag6I11 (1) and [NH4][Ni(2,2-bipy)3]2Ag6Br11 (2). Two compounds are structurally isomorphic and contain the two-dimensional [Ag6X11]n5n− (X = I, Br) anionic layers that are perforated with large hexagonal windows. Optical properties show that compounds 1 and 2 exhibit the optical band gaps of 1.75 and 2.84 eV, respectively, demonstrating the visible-light responsive semiconductor behaviors. Under the alternating light irradiation, two as-synthesized materials possess the good photoelectric conversion abilities, with the observed photocurrent densities (0.20 and 0.22 μA cm⁻² for 1 and 2) comparable with many excellent metal halide competitors. Further density functional theory calcualtions disclose that the photosensitive metal complexes serve as the key factor in the charge transfer and carrier transport that may ultimately result in the satisfying photoelectric performances. Additionally, Hirshfeld surface analyses, thermogravimetric studies, and X-ray photoelectron spectroscopy characterizations of title compounds were also conducted in this work.
研究领域:
材料化学
·
无机化学
·
光电材料
·
晶体工程
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
He Liu,Gaozhao Chen,Xiong Shen,Wentao Hao,Qiuyun Ouyang
To solve the toxicity and stability issues of traditional lead halide perovskites, Cs2AgBiBr6@TiO2 nanocomposites were synthesized via a thermal injection method. Cs2AgBiBr6 quantum dots (QDs) and Cs2AgBiBr6@TiO2 nanocomposites were dispersed in methyl methacrylate (MMA) to prepare (Cs2AgBiBr6)6/PMMA and (Cs2AgBiBr6@TiO2)6/PMMA organic glasses (OGs). The nonlinear absorption (NLA) properties of the materials were investigated using the open-aperture Z-scan technique, revealing that after compositing with TiO2, the reverse saturable absorption (RSA) coefficient of the (Cs2AgBiBr6@TiO2)6/PMMA OG increased from 194 cm GW−1 to 294 cm GW−1 at an energy of 10 µJ. This is attributed to the incorporation of TiO2, which facilitates interfacial charge separation and accelerates electron transfer, thereby significantly enhancing the RSA of Cs2AgBiBr6@TiO2. Under identical testing conditions, the optical limiting thresholds of the (Cs2AgBiBr6)6/PMMA and the (Cs2AgBiBr6@TiO2)6/PMMA OGs were measured to be 5.33 J cm−2 and 3.87 J cm−2, respectively. Compared to the (Cs2AgBiBr6)6/PMMA OG, the (Cs2AgBiBr6@TiO2)6/PMMA OG demonstrates superior optical limiting performance. Electrochemical impedance spectroscopy (EIS) measurements demonstrated that Cs2AgBiBr6@TiO2 exhibits lower impedance (Rct) and favorable photocurrent response (0.61 µA cm−2), confirming its efficient charge separation/transport capability, which further promotes the RSA effect of Cs2AgBiBr6@TiO2. These results indicate that Cs2AgBiBr6@TiO2 holds promising potential for applications in optical limiting devices.
研究领域:
材料科学
·
光子学
·
纳米技术
·
电化学
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Runyun He,Tianwen Liu,Liqiang Zhang,Tuoyu Liu,Dan Tang,Wenxia Zhang,Jundong Tao,Tingting Shi,Yijing Song,Haifeng Cheng,Yao Zhang,Dongqing Liu
Variable emissivity devices enable dynamic infrared emissivity modulation for thermal camouflage, energy-efficient architecture, spacecraft thermal control, and wearable thermoregulators. While reversible metal electrodeposition allows remarkable spectral modulation via controlled metal deposition/dissolution, electrode degradation-induced cycling instability hinders practical application. Ultra-thin Ir-based electrode strategy is developed to enhance durability of reversible copper electrodeposition variable-emissivity device. The Ir-electrode-enabled devices exhibit merely 11% degradation in radiative temperature variation after 8000 cycles and 23% attenuation in emissivity modulation after 6000 cycles, substantially outperforming Pt-based counterparts (54% attenuation after 5000 cycles). This stability stems from Ir's inherent chemical inertness, superior conductivity, and mechanical robustness, which collectively suppress stress-induced cracking, electrolyte corrosion, and electrochemical oxidation. Ir-Au grid composite electrode ensures homogeneous deposition/dissolution, maintaining performance in large-area rigid and flexible devices (>3000 cycles on 10 × 10 cm 2 rigid Si, >1000 cycles on 8 × 8 cm 2 flexible polyamide). Integration of Cr 2 O 3 optical interference layer with Ir electrode on BaF 2 enables dual-band modulation (visible coloration and 3–14 µm infrared wavelength, emissivity modulation range Δε = 0.56) with stability exceeding 10 000 cycles. The Ir-based electrode engineering exhibits enhanced stability, scalable manufacturability, compliant substrate integration, and color-compatible operation, providing pivotal implications for thermal regulation systems, IR stealth applications, and advanced display technology.
研究领域:
材料科学
·
电化学
·
光学器件
·
热管理
·
智能涂层
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2026
·
IF 4.5
Danruoyu Wang,Zhizhuo Zhang,Yashi Chen,Shun Wang,Fengzhen Lv,Yong Yang,Huimin Tang,Fuchi Liu
Imprinting vision as memory is essential for brain-inspired computing, requiring devices that integrate memory and processing. However, this technique development is hindered by limited memory states and segregated functionalities. In this work, a lead-free Sn-doped Cs 2 AgBiBr 6 (Cs 2 Ag 0.85 Sn 0.15 BiBr 6 ) optoelectronic memristor is proposed to integrate high-density memory and visual perception capabilities. For the first time, the nine-state memory driven by a 450 nm light at different intensities was achieved in the Cs 2 AgBiBr 6 -based device. These states remained stable for over 2000 s and through 620 cycles, demonstrating robust high-density memory capability and guaranteeing the accuracy of visual simulation. Random letter recognition and color image processing were performed by logic operations (AND, XOR) on the optically modulated resistance states. Key synaptic functions were also emulated, enabling a “learning-forgetting-relearning” process. Fundamentally, the optimal 15 % Sn doping at the Ag site narrowed the bandgap of films and increased the bromine vacancy concentration, enhancing the optically controlled memristive effect. The Schottky-like barrier at the Au/Cs 2 Ag 0.85 Sn 0.15 BiBr 6 interface was modulated by photo-induced carriers, which further influenced the multilevel memristive behavior. Our study offers a promising strategy for enabling synergistic sensing-memory-computing in a standalone device for human-machine interaction systems with visual data storage, buffering, and processing capabilities.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）