GIANT
·
2023
·
IF 7
Yikai Wang,Rui Long,Yang Yang,Daoli Zhang,Jianbing Zhang
Patterned quantum dot color converters (QDCCs) convert blue light to green and red light at the pixel level, thus having potential applications in combination with micro-LED and OLED. Lithography is a promising method to fabricate the QDCCs, however, it is still a challenge to achieve highly luminescent and stable patterned QD-photoresist (PR) thick films. Herein, a strategy is developed to fabricate high-performance patterned QDCCs using the lithography process. Firstly, the QDs are modified by replacing their native hydrophobic ligands to achieve compatibility with PRs. Then, a new ligand, diphenylphosphine oxide (DPPO), is introduced to remedy surface defects of the modified QDs. Lastly, conventional lithography is adopted to fabricate QDCCs with a pattern size of 50 × 10 µm and a thickness of 8 µm. The passivation with DPPO is critical to the luminescent properties of the QD-PR films. The DPPO substantially increases the PLQYs of the PR-compatible QDs and the QD-PR films, achieving a supreme PLQY of 71.7% for the green QD-PR films. The present work might shed light on improving the performance of patterned QDCCs and accelerate their applications in new types of display technology.
研究领域:
材料科学
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高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Liu Mengjun,Yang Ruizhi,Guo Zhenghao,Chen Kexu,Feng Haoqiang,Lu Han,Huang Shijian,Zhang Minmin,Ye Huapeng,Shui Lingling
Lithography technology is a powerful tool for preparing complex microstructures through projecting patterns from static templates with permanent features onto samples. To simplify fabrication and alignment processes, dynamic photomask for multiple configurations preparation becomes increasingly noteworthy. Hereby, we report a dynamic photomask by assembling the electrically stimulated nematic liquid crystal (NLC) into multifarious architectures. This results in reconfigurable and switchable diffraction patterns due to the hybrid phase arising from the NLC molecular orientations. These diffraction patterns are adopted as metamask to produce multiple microstructures with height gradients in one-step exposure and hierarchical microstructures through multiple in-situ exposures using standard photolithography. The fabricated pattern has feature size about 3.2 times smaller than the electrode pattern and can be transferred onto silicon wafer. This strategy can be extended to design diverse microstructures with great flexibility and controllability, offers a promising avenue for fabricating metamaterials via complex structures with simplified lithography processes.
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 35
·10777-10782
·
IF 6.641
Fuqiang Fan,Cheng Liu,Sha Wang,Jinqiu Lv,Wenze Li,Yu Fu,Huaping Xu
An ordered pattern or a distinct texture on surfaces endows materials with specific applications, such as oil–water separation, advanced anticounterfeiting and optical devices. Conventional photolithography and surface patterning methods can form only 2D patterns, and they are also limited by the shape of a material and the required equipment. In this study, a swelling-induced 3D photopatterning (SPP) method is demonstrated to manipulate both the shape and surface pattern of a material. Under the irradiation of visible light, metathesis of diselenide bonds induces different swelling behaviors between irradiated and nonirradiated regions. Based on the differences, various programmable 3D patterns are obtained. Notably, the SPP method is not limited by the size and shape of the material; therefore, this method can be applied to thin film materials, bulk materials and cylindrical materials. In addition, this strategy has potential applications in advanced anticounterfeiting.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Energy & Environmental Materials
·
2022
·Vol. 6
·期 3
·e12375
·
IF 13.443
Zihan Xu,Wenxin Fan,Jinghua Duan,Yanzhi Xia,Zhihong Nie,Kunyan Sui
The 3D shape-changing hydrogels are highly pursued for numerous applications. However, up to now, the construction of complex 3D shape-changing hydrogels remains a challenge. The reported design strategies are mainly applied to fabricate 2D ones by introducing anisotropic microstructures into hydrogel sheets/membranes. Herein, we present a convenient photolithography strategy for constructing complex 3D shape-changing hydrogels by simultaneously modulating anisotropic microstructures and internal stress fields of gel sheets. When the precursor solution containing ultraviolet (UV) absorber is irradiated by single-side UV light, the attenuated polymerization rate can cause the generation of asymmetric internal stress field in the resulting hydrogel sheet. In the meantime, the directional diffusion of unpolymerized monomers allows for the formation of vertical gradient structure within hydrogel. Therefore, by applying different photomasks to modulate the local gradient structures and internal stress fields of the gel sheets, they can spontaneously transform into various complex 3D shape-changing hydrogels in the air. Response to the external stimuli, these 3D shape-changing hydrogels (e.g., fighter plane, birdie, and multi-storey origami lattices) can deform in a novel 3D 1 -to-3D 2 -to-3D 3 mode. This new design strategy contributes to the development of complex biomedical implants and soft robotics.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 24
·5509
·
IF 4.967
Haoying Wang,Xiaoxia Song,Junfeng Xiong,U Kei Cheang
Magnetically actuated microrobots showed increasing potential in various fields, especially in the biomedical area, such as invasive surgery, targeted cargo delivery, and treatment. However, it remains a challenge to incorporate biocompatible natural polymers that are favorable for practical biomedical applications. In this work, bilayer magnetic microrobots with an achiral planar design were fabricated using a biocompatible natural polymer and Fe3O4nanoparticles through the photolithography by applying the layer-by-layer method. The microrobots consisted of a magnetic bottom layer and a photo-crosslinked chitosan top layer. The SEM results showed that the microrobot processed the L-shaped planar structure with the average width, length, and thickness of 99.18 ± 5.11 μm, 189.56 ± 11.37 μm, and 23.56 ± 4.08 μm, respectively. Moreover, microrobots actuated using a three-dimensional (3D) Helmholtz coil system was characterized and reached up to an average maximum velocity of 325.30 μm/s and a step-out frequency of 14 Hz. Furthermore, the microrobots exhibited excellent cell biocompatibility towards L929 cells in the CCK-8 assay. Therefore, the development of bi-layered chitosan-based microrobots offers a general solution for using magnetic microrobots in biomedical applications by providing an easy-to-fabricate, highly mobile microrobotic platform with the incorporation of biocompatible natural polymers for enhanced biocompatibility.Keywords:chitosan;microrobot;photolithography;natural polymer;magnetic actuation
研究领域:
生物医学工程
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材料科学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Quan Nie,Junpeng Fan,Rui Xu,Zhiwei Yao,Yuqi Xiao,Chaoyu Xiang,Lei Qian,Ting Zhang
As one of the most promising next-generation display technologies, quantum dot light-emitting diodes (QLEDs) possess various advantages, such as high color purity, wide color gamut, high brightness, and solution processability. The preparation of quantum dot (QD) pixels is essential for commercializing QLED displays, and direct photolithography is considered an efficient method for fabricating ultra-high-resolution devices over large areas. However, the QD direct photolithography technology is still in its infancy. This study presents a novel direct photolithography technique based on a typical azide-alkyne click reaction. This method enables the cross-linking of adjacent QDs in an air environment using a 365 nm UV light source, and a low-energy dose (≈36 mJ cm −2 ). In addition, the QLEDs with crosslinked QD layers exhibit excellent performance, achieving a peak external quantum efficiency (EQE) of 20.05% and a maximum brightness over 166,000 cd m −2 at 5 V. Meanwhile, the QLEDs with pristine and photolithographic QDs exhibit comparable operational lifetime (T 95 ). It is believed that the novel direct photolithography technology based on azide-alkyne click reaction will advance the development of patterned QDs and facilitate the industrial production of ultra-high resolution QLED displays.
研究领域:
材料科学
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显示技术
·
化学工程
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2014
·Vol. 24
·期 41
·6430-6438
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IF 10.439
Siyun Ye,Qianqian Fu,Jianping Ge
Invisible photonic prints shown by deformation are prepared by soaking the mechanochromic photonic paper with crosslinker (PEGDA) and subsequently crosslinking part of the paper through a photo lithography process. The key point of this new technique is creating patterns and background with very close photonic structures but different mechanochromic capabilities, so that the invisible photonic patterns in relaxed state can be revealed under deformation due to the nonuniform change in photonic structure. Based on the relationship between crosslinking level and the reflection changes during deformation, one can conclude that a low crosslinking level favors the hiding of invisible patterns and a high crosslinking level favors the showing of patterns. The as-prepared samples can instantly and reversibly show the patterns by deformation and hide them by relaxation for many times, and the encapsulation by PDMS rubber prolongs its life time and enhances its durability in practical usages. The current printing technique is capable of creating invisible photonic prints in both macroscale and microscale range, which makes them potentially useful for security and antifraud applications in daily life.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 7
·期 6
·2101230
·
IF 7.848
Jingwei Liu,Yuncheng Liu,Chunsan Deng,Kewang Yu,Xuhao Fan,Wenguang Zhang,Yufeng Tao,Huace Hu,Leimin Deng,Wei Xiong
Semiconductors are the cornerstones of the current information age. Next-generation integrated optoelectronics calls for ultrahigh-resolution manufacturing of sophisticated three-dimensional (3D) semiconductor products, which introduces tremendous challenges for conventional planar lithography techniques. State-of-the-art 3D printing techniques are promising but hampered by the absence of functional precursors for semiconductor formation. Here, a facile method to synthesize versatile and customizable metal-bound composite photoresins for 3D printing various nano-architected metal oxide semiconductors is reported. These photoresins can be readily synthesized using metal-organic framework (MOF) precursors and commercially available monomers, which are free of the nanoparticle-induced scattering effect. Arbitrary 3D architectures of metal oxide semiconductors (e.g., ZnO and Co 3 O 4 ) are additively manufactured with a high resolution of 170 nm, high shape fidelity, and high surface quality. A ZnO-based micro-ultraviolet photodetector is fabricated to demonstrate its potential applications in optoelectronic devices. The versatile photoresins are expected to have broad applicability for various functional materials and pave the way for the fabrication of 3D integrated functional devices.
研究领域:
材料科学
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电子工程
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化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Xinzhi Liang,Qiaolei Li,Boyang Qu,Yuxiang Qiu,Shengqi Liu,Qing Wang,Jingjing Liang,Haibing Tan,Yanfei Liu,Jinguo Li
High absorbance and high refractive index have always been obstacles to the wide application of silicon carbide ceramics in stereolithography technology. To address the problems of low curing thickness, high viscosity, and poor stability of SiC photosensitive slurry, this study developed a novel resin system with HDDA, TMPTA, DPHA, and PEG200 (volume ratio = 2:6:1:1), incorporating anti-settling agents and plasticizers to enhance the performance of the slurry. The effects of the resin system on the preparation of SiC ceramics by stereolithography were analyzed, focusing on the properties of slurry, forming precision, and mechanical properties of the green body. The optimized slurry exhibited a dynamic viscosity below 3 Pa·s, a sedimentation height (<1% in 24 hours), and a single-layer curing thickness of 85 μm. High-precision and excellent surface quality SiC mirrors were prepared by stereolithography 3D printing and sintered by reactive melt infiltration process (RMI) at 1600 ℃ in Ar 2 . The optimization strategy of SiC slurry proposed in this work provides feasibility for preparing high-precision and high-strength SiC mirrors, which is expected to promote the application of SiC ceramics in the aerospace field.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2019
·
IF 3.45
Yao Liu,Lina Zhan,Yu He,Jun Zhang,Jianjun Hu,Lijin Cheng,Qiumei Wu,Shaojun Liu
Photocurable gray-colored Si 3 N 4 ceramic slurry with high solid loading, suitable viscosity and high curing depth is critical to fabricate dense ceramic parts with complex shape and high surface precision by stereolithography technology. In the present study, Si 3 N 4 ceramic slurry with suitable viscosity, high solid loading (45 vol %) and curing depth of 50 μm was prepared successfully when surface modifier KH560 (1 wt%) and dispersant Darvan (1 wt%) were used. The slurry exhibits the shear thinning behavior. Based on the Beer-Lambert formula, D p ( the attenuation length) and E c (the critical energy dose) of Si 3 N 4 ceramic slurry with solid loading of 45 vol % were derived as 0.032 mm and 0.177 mJ/mm 2 , respectively. Si 3 N 4 ceramic green parts with complex shape and high surface precision were successfully fabricated by stereolithography technology. After optimizing the debinding and sintering process for green parts, dense Si 3 N 4 ceramics with 3.28 g/cm 3 sintering density were fabricated. The microhardness and fracture toughness of as-sintered Si 3 N 4 ceramics are ~14.63 GPa and ~5.82 MPa m 1/2 , respectively, which are comparable to those of the samples by traditional dry-pressed and pressureless sintering technology. These results show that ceramic stereolithography technology could be promising to fabricate high performance ceramics, especially for gray-colored monolithic Si 3 N 4 ceramics.
研究领域:
材料科学
·
先进制造
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
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IF 2.76
Fapeng Wang,Song Li,Li Wang
The surfaces of plants represent multifunctional interfaces between the organisms and the environment. The paper reports an experimental method to improve the bamboo properties, in terms of hydrophobicity, and resistance to water absorption. The soft lithography technique was used to modify the bamboo surface, transferring over it a lotus-leaf-like topography, based on a micro/nano hierarchical structure using fresh lotus leaves as the template and polydimethylsiloxane (PDMS) for seal. Results describe a characterization based on topographical, chemical and water contact angle analysis. The super-hydrophobicity of lotus-like bamboo surfaces were analyzed by virtue of WCA and the microstructures observed by means of SEM, showing a WCA of 156.5° close to that of the lotus leaf’s 160.5°, and rough surface structures with micro-nano papillate hills on bamboo surfaces. Water droplets could easily roll down on such bamboo surfaces, exhibiting super-hydrophobic and low adhesion properties. The successful fabrication of lotus-leaf-like bamboos provided a new direction for researches on the water corrosion resistance of bamboos, which could effectively prevent the damage of moisture to bamboos.
研究领域:
材料科学
·
植物学
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高影响因子
Pharmaceutics
·
2021
·Vol. 13
·期 10
·1717
·
IF 6.321
Lei Xu,Qingliang Yang,Wei Qiang,Huijie Li,Weizhen Zhong,Siying Pan,Gensheng Yang
Three-dimensional (3D) printing technology, specifically stereolithography (SLA) technology, has recently created exciting possibilities for the design and fabrication of sophisticated dosages for oral administration, paving a practical way to precisely manufacture customized pharmaceutical dosages with both personalized properties and sustained drug release behavior. However, the sustained drug release achieved in prior studies largely relies on the presence of hydrophilic excipients in the printing formulation, which unfortunately impedes the printability and formability of the corresponding printing formulations. The current study developed and prepared mini-sized oral pellets using the SLA technique and successfully accomplished a hydrophilic excipient-independent drug release behavior. With ibuprofen as the model drug, the customized photopolymerizable printing formulation included polyethylene glycol diacrylate (PEGDA) as a monomer and diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (TPO) as a photoinitiator. The produced mini-sized pellets were thoroughly investigated for various factors, including their printability, physical properties, microscopic features, drug content, and drug-release profiles. The drug release profiles from the printed pellets that were larger size (3 mm and 6 mm) followed the Ritger–Peppas model, demonstrating that the release was influenced by both the diffusion of the dissolved drug and by the erosion of the hydrophilic excipients (PEG400). The profiles from the smaller printed pellets (1 mm and 2 mm) followed first release kinetics, not only illustrating that the release was impacted only by drug diffusion, but also indicating that there is a size boundary between the dependent and independent hydrophilic excipients. These results could create practical benefits to the pharmaceutical industry in terms of the design and development personalized dosages using the SLA printing technique with controllable drug release by manipulating size alone.Keywords:stereolithography;three-dimensional printing;3D printed oral dosage forms;mini-sized pellets;modified release
研究领域:
药学
·
生物医学工程
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PubMed
高影响因子
危险品化学品经营许可证（带存储）