CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanli Zhang,Meigui Ou,Chunlin Yang
In this paper, erbium-doped gadolinium oxide rare earth oxide nanoparticles (Gd 2 O 3 :Er 3+ ) with good light absorption capacity from the visible to the infrared region were prepared by polyol method, and then compounded with TiO 2 by hydrothermal method. SEM, TEM, XPS, UV–vis and electrochemical workstation were used to study the morphology, structure, UV–vis light absorption and photoelectrochemical (PEC) properties of Gd 2 O 3 :Er 3+ /TiO 2 . The results showed that the Gd 2 O 3 :Er 3+ spherical nanoparticles with a particle size of about 15 nm were uniformly distributed on the surface of the TiO 2 nanorod array, and the Gd 2 O 3 :Er 3+ /TiO 2 nanocomposites had good light absorption capacity in the infrared region. Furthermore, the photocurrent densities of Gd 2 O 3 /TiO 2 and Gd 2 O 3 :Er 3+ /TiO 2 were 2.08 and 2.75 times higher than those of TiO 2 , respectively, manifesting that the broadening of infrared light absorption can improve the PEC property of TiO 2 . Meanwhile, the DFT calculation results showed that the energy band of Gd 2 O 3 :Er 3+ /TiO 2 was significantly narrower than that of TiO 2 , indicating that Gd 2 O 3 :Er 3+ /TiO 2 had a redshift phenomenon of UV–vis absorption. The calculation results of state density showed that the f orbital of Gd 2 O 3 :Er 3+ intersected with the d orbital of TiO 2 , indicating that there is an electron transfer between Gd 2 O 3 :Er 3+ and TiO 2 .
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SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Yang Yi,Weiming Lin,Chengwei Wu,Kui Cheng
Surface potential is crucial in determining cell fate, but the influence of subcellular size micro-domain potential on cell fate remains explored. In this study, we present a novel bioactive surface composed of polypyrrole (PPy) on titanium dioxide (TiO 2 ) nanodots with a light-controllable micro-domain surface potential. SEM and TEM results show that TiO 2 nanodots are fully coated with a PPy layer. Photoluminescence and UV–Vis studies show that PPy-TiO 2 interactions generate a synergistic effect, reducing the band gap and enhancing electron-hole separation efficiency. Using Kelvin probe force microscopy, we observed that PPy/TiO 2 nanodots coatings exhibit a distinct micro-domain surface potential at the submicron level, dynamically modulated by external light stimulation. In vitro cell behavior evaluation showed that micro-domain surface potential coatings are biocompatible and cause no damage with limited illumination time. Our findings indicate that the light-controllable micro-domain composite nanodots coatings offer a promising approach to precisely control cellular behavior and provide a new perspective for designing stimuli-responsive charged biomaterials.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jiayue Wang,Reili Li,Jinke Wang,Yujie Gao,Meiyi Wang,Huashan Wang
As an essential material for manufacturing lithium batteries, the demand of lithium is increasing, which means novel extracting method from various lithium-containing solutions is necessary. Spiropyran molecules undergo a photoisomerization reaction under light, transitioning from a closed-ring form (colorless) to an open-ring form (colored), generating multiple coordination sites to form coordination bonds with metal ions. In this paper, a polyacrylamide/carboxymethyl chitosan composite aerogel grafted with photoresponsive spiropyragroups (Fe 3 O 4 /CNTs@PAM/CS-SP), used for extracting lithium from solutions, was prepared by dual cross-linking and vacuum freeze-drying. Batch adsorption experimental results showed that the incorporation of Fe 3 O 4 nanoparticles further enhances its adsorption capability, as it enables rapid separation of the aerogel from water using an external magnetic field and also improves the adsorption efficiency due to its magnetic properties. The aerogel exhibits good adsorption capacity in the pH range of 9–12 and shows selectivity for Li in simulated brine, achieving a maximum adsorption capacity of 176.5 mg/g at 35 °C and a Li concentration of 1 g/L. The preparation of this aerogel offers a novel and effective approach to creating environmentally friendly adsorbents, providing a new method for extracting lithium from lithium-containing solutions.
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高影响因子
Chem
·
2024
·
IF 19.1
Ying-Xue Yuan,Jia-Ni Zhang,Jun-Ru Wang,Kai Li,Shuang-Quan Zang
The construction of effective artificial chiral light-harvesting systems ( C -LHSs) is significantly important as it provides insights into the hierarchical levels of chirality evolution in natural systems. Herein, we devised pairs of chiral blue emitters, S -/ R -binaphthalene dioxygen- N -octadecamidephthalimide ( S -/ R -BPOA), which function as donors of chirality and light absorbers. S -/ R -BPOA co-assembled with enantiomers of atomically precise yellow-emitting subnanometer-scale Ag 6 clusters to fabricate C -LHSs. Within these hybrid C -LHSs, we successfully resolved enantioselective chirality/energy transfer that was dependent on the handedness of the components. This promoted the efficient circularly polarized energy transfer in chirality-compatible ensembles, resulting in a remarkable amplification of circularly polarized luminescence (CPL) in the ultrasmall silver cluster. The achieved dissymmetry factor ( g lum ) reached an impressive value of 1.54 × 10 −2 , and white-light CPL with chromaticity coordinates of (0.32, 0.33) was obtained. Furthermore, the customizable fluorescence and CPL in these C -LHSs bestow them with potential application possibilities in information storage and encryption.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jiaxing Zhu,Ciyu Ge,Borui Jiang,Xiang Zhang,Jiajun Luo,Jiang Tang
Tin-halide perovskites (THPs) offer a promising alternative to lead-halide perovskites (LHPs), addressing environmental concerns while providing excellent optoelectronic properties. However, the performance of THP light-emitting diodes (LEDs) remains inferior to their lead-halide counterparts due to challenges such as Sn 2 ⁺ oxidation, rapid crystallization, and high defect densities. Here, for the first time, a multifunctional Lewis-base reducing ligand triphenylphosphine (TPP) is reported, which simultaneously suppresses Sn 2+ oxidation and passivates defects in 2D THPs TEA 2 SnI 4 (TEA represents 2-thienylethylamine). The P atom in TPP, with its lone pair electrons on the 3p orbital, has low electronegativity and high electron density, which can effectively suppress Sn 2+ oxidation. Furthermore, σ-donation and π-conjugation effects from the three phenyl groups in the TPP molecule enable it to strongly coordinate with Sn 2+ , which passivates defects in TEA 2 SnI 4 . These properties enhance the stability and optoelectronic properties of THPs. When the optimized THP films are implemented as active layers in LEDs, they exhibit a narrow electroluminescence full-width at half-maximum of 28 nm, Commission Internationale de l'Eclairage x-coordinate exceeding 0.7, and a peak external quantum efficiency of 10.12%, sevenfold higher than the pristine devices. This work demonstrates the potential of molecular additives to enhance the device performance of tin-based perovskites.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 48
·2412099
·
IF 27.4
Hongzhi Zhang,Hong Li,Junpeng Li,Conglin Liu,Hongming Jiang,Yuxin Liu,Rui Wang,Jiyang Xie,Wanbiao Hu,Jing Zhu
Achieving single-phase full-spectrum white light (SFWL) phosphors is a central goal in the optical field because they simplify white-LEDs assembly and avoid long-term color instability. Despite many approaches are developed, current SFWL phosphors still suffer from chromaticity drift due to inconsistent thermal quenching of multiple emitting centers. Herein, an absolutely structural disorder strategy is established to develop a single-emitting center-based SFWL phosphor. Precisely controlling the flux added induces a structural translation from the absolutely ordered Y 0.75 Ta 0.25 O 1.75 :Bi 3+ to the absolutely disordered Y 0.785 Ta 0.215 O 1.715 :Bi 3+ , as directly identified by STEM-HAADF analyses. Structural disorder enables Y 0.785 Ta 0.215 O 1.715 :Bi 3+ to produce SFWL with the FWHM of 6194 cm −1 (175 nm) by employing a single activator site, a 1352 cm −1 increase compared to the cyan-emitting Y 0.75 Ta 0.25 O 1.75 :Bi 3+ despite Bi 3+ occupies two lattice positions. This single-emitting center-based SFWL, coupled with minimal thermal expansion of the unit cell and inapparent spectral overlap of excitation and emission bands, ensure zero-chromaticity shift with elevated temperature. A prototype white-LEDs using Y 0.785 Ta 0.215 O 1.715 :Bi 3+ as a single luminescent layer generates warm white light without perceptible CIE coordinates shift under various currents or after extremely long-term continuous operation. This work highlights the potential of structural disorder in designing SFWL phosphors with exceptional color stability.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 52
·2413857
·
IF 27.4
Weibin Chen,Yuzhen Wang,Gaochao Liu,Chaojie Li,Zhiguo Xia
Ultrabright broadband near-infrared (NIR) phosphor-converted laser diode (pc-LD) as a light source is increasingly essential for improving the sensitivity and spatial resolution of intelligent NIR spectroscopy technologies. However, the performance of NIR pc-LD is greatly hindered by the low external quantum efficiency (EQE) and poor thermal resistance of phosphor materials. Herein, a highly stable phosphor-in-ceramic (PiC) film deposited on high thermal conductivity substrate, in which the NIR-emitting Ca 3 MgHfGe 3 O 12 :Cr 3+ phosphor is incorporated into a glass-crystallized Ca 3 Ga 2 Ge 3 O 12 ceramic matrix, along with the formation of a new type PiC composite material with high efficiency, absorbance, and thermal conductivity, is designed and prepared. The obtained PiC exhibits an impressive EQE of 57.7%, high thermal conductivity of 17.1 W m −1 K −1 , and the PiC wheel demonstrates a broadband NIR emission exceeding 5 W when excited by a 450 nm laser. Finally, a groundbreaking electrically driven pc-LD device based on PiC achieves 1.6 W of NIR output, enabling multiple intelligent spectroscopy applications in archaeology and night vision imaging. This work paves the way for advancing broadband NIR light sources in a diverse range of photonic applications.
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ACS Applied Optical Materials
·
2025
·
IF 3.8
Yujiao Jiang,Ziyi Ye,Mengling Yu,Zhengxing Gong,Xinfeng Zhang
With the widespread use of personal electronic devices, excessive blue light exposure that causes retinal cell damage and skin hyperpigmentation has attracted increasing attention. However, an effective indicator for real-time in-house monitoring of blue light is still lacking. In this study, we developed a screen-attachable visual hydrogel indicator for facile in-house monitoring of blue light. The indicator is fabricated by encapsulating both a blue light-responsive photosensitizer (fluorescein) and 3,3′,5,5′-tetramethylbenzidine (TMB) within an agarose hydrogel. Upon exposure to blue light, the photosensitizer generates reactive oxygen species (ROS), which oxidize colorless TMB to blue oxTMB. The proximity of fluorescein and TMB within the hydrogel nanopores significantly facilitates the oxidation reaction. Hence, using a hydrogel as the reaction carrier not only makes the indicator screen-attachable but also greatly enhances its sensitivity. The color change of TMB is good linearly with the blue light doses in the range of 0.15–1.2 J/cm2 with a detection limit about 0.082 J/cm2, much lower than the threshold (0.75 J/cm2) for oxidative eye stress. Green and red light from the electronic products caused no interference for the monitoring of blue light. It was successfully applied for monitoring the cumulative dose of blue light emitted from the three types of electronic products (i.e., laptops, tablets, and light-emitting diode (LED) lamps) by simply attaching the indicator on the screen or on the desk. This hydrogel indicator, with the merits of screen-attach ability, facile use, and high sensitivity, is quite appealing for in-house monitoring of blue light from electronic products.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qian Wang,Mingjie Chen,Junwei Yao,Gang Zhou,Dandan Zhang,Qingshan Shi,Qianwen Mai,Xiaobao Xie
The increasing prevalence of drug-resistant bacteria and the ecological burden of synthetic antimicrobials demand sustainable biomaterials with superior antibacterial properties. Natural lignin, an amorphous polymer, presents considerable potential as a structural building block for sustainable biomaterial. Herein, inspired by antimicrobial photodynamic inactivation, kraft lignin was first reacted with formaldehyde and ethylenediamine to synthesize aminated lignin, the aminated lignin was further reacted with acetic anhydride, resulting in modified lignin. Thereafter, the modified lignin functions as a carrier, encapsulating the hydrophobic photosensitizer chlorin e6 to improve its dispersibility and aqueous solubility. Chitosan was further utilized to coat the nanoparticles, improving bacterial uptake, ultimately obtaining the desired final nanospheres (CS-ML-Ce6). Upon laser irradiation, CS-ML-Ce6 achieved >99.99 % bactericidal efficiency against methicillin-resistant Staphylococcus aureus . Additionally, it demonstrated a minimum inhibitory concentration of modified lignin of 67.71 μg/mL when exposed to light. It could result in membrane disruption and intracellular component leaking, while bacterial adsorption increased to 47.36 %. The dead/live rate of CS-ML-Ce6 against drug-resistant pathogens was almost 8-fold to modified lignin control. Concurrently, hemolysis assays with rabbit red blood cells confirmed exceptional biocompatibility, with hemolysis rates maintained below 5 % even at 6 × MIC concentrations. Considerable reactive oxygen species scavenging effectiveness at both the solution and cellular levels was also observed of CS-ML- Ce6, this dual-function approach uniquely combines light-activated bactericidal properties and dark-phase antioxidant repair. Utilizing lignin, an industrial byproduct, provides an efficient and promising antimicrobial alternative to prevent overuse of antibiotics and has significant potential for human healthcare.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Si-Zhe Sheng,Zhi-Yu Xian,Wen-Shuo Zhang,Jin-Long Wang,Xue-Fei Feng,Gang Pei,Bin Zhao,Jian-Wei Liu,Shu-Hong Yu
Smart windows, fabricated from stimulus-responsive chromogenic materials, can modulate the transparency of a window toward sunlight to control room temperature. The widespread implementation of this technology can improve indoor comfort and effectively reduce energy consumption. However, due to their initial optical properties, chromogenic materials in solid-state smart windows continue to absorb sunlight, causing overcooling and temperature instability. Here, stimulus-responsive chromogenic nanowires (NWs) and photothermal actuators are combined to create flexible, macro-deformed smart curtains. The difference in thermal expansion coefficient between bacterial cellulose and polyethylene in actuators allows the smart curtains to keep curled at low light intensities (off-state) and unroll under intense light (on-state). The solar modulation efficiency is further enhanced by the synergy of chromogenic (thermochromic or photochromic) NWs. When rolled up, the smart curtains allow ample sunlight to pass through ordinary windows (92.0% of solar radiation) for heating. They can achieve temperature reductions exceeding 6.0 °C, attributed to the regulation of solar radiation, with 62.3% for thermochromic smart curtains and 79.1% for photochromic smart curtains. Besides, the smart curtains can be mounted directly on the building frame without replacing existing windows. These results illustrate the feasibility of smart curtains and represent a conspicuous step toward sustainable building technologies.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lijin Cheng,Pengxiang Hao,Fei Liu,Yan Li,Yujie Zhao,Shaojun Liu
The (1-x)Mg 2 TiO 4 -xCa 0.8 Sr 0.2 TiO 3 (MT-CST) ceramic filters with intricate structures, low insertion loss and near-zero resonant frequency temperature coefficient were successfully fabricated by heated-assisted digital light processing (DLP). The excellent dielectric properties of DLP-printed ceramic filters could be attributed to the utilization of ceramic slurries with high solid loading, the improvement of forming accuracy and the control of CST content. The increasing of curing temperature could facilitate the mobility of the molecular segments and increase the activation energy of the free radicals, consequently leading to the reduction in viscosity and the improvement in curing properties of the MT-CST ceramic slurries with 57.5 vol% solid loading. The forming accuracy was regulated by fine-tuning the exposure energy densities. The excess curing width of precision model increased from 25 to 35 μm when the exposure energy densities increased from 7 to 11 mJ/cm 2 . The 0.91MT-0.09CST ceramics sintered at 1450 ℃ for 4 h exhibited excellent dielectric properties: ε γ = 17.5; Q × f = 46,800 GHz; τ f = -3.21 ppm/℃. The DLP-printed 0.91MT-0.09CST ceramic filters showed an excellent insertion loss of −1.3 dB.
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Journal of Physical Chemistry Letters
·
2023
·
IF 5.7
Fei Li,Jiao Jiao Liu,Qiulei Xu,Ruiguang Chang,Lei Wang,Zhenghui Wu,Huaibin Shen,Zuliang Du
PbS quantum dot light-emitting diodes (QLEDs) emitting around 1550 nm promise important applications in optical communications. However, due to insufficient suppression of surface traps for large-size PbS quantum dots (QDs), their performance under large driving current density was not satisfactory. In this work, octanethiol surfactant was added into a PbS QD solution and adsorbed onto the dot surface. As a result, the surface traps and the continuous oxidation of the unprotected (100) facets in PbS QDs were greatly suppressed. Therefore, the PbS QDs with octanethiol doubled their photoluminescence efficiency and showed outstanding stability. The PbS-based QLEDs with benchmark device structure showed a breakthrough high radiance of 18.3 W sr–1 m–2 with >2000 mA/cm2 driving current density. The efficient passivation of surface traps with octanethiol surfactant and the suppressed coupling between excitons and surface states under large working current were the main reasons for achieving the breakthrough high radiance.
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