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Biodegradable Sensors: Biodegradable Microparticles for Simultaneous Detection of Counterfeit and Deteriorated Edible Products (Small 39/2017) 
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下载免费PDF全文 Ivan Rehor Sophie van Vreeswijk Tina Vermonden Wim E. Hennink Willem K. Kegel Huseyin Burak Eral 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(39)
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Biomimetics: Biomimetic Microfingerprints for Anti‐Counterfeiting Strategies (Adv. Mater. 12/2015) 下载免费PDF全文
下载免费PDF全文 Hyung Jong Bae Sangwook Bae Cheolheon Park Sangkwon Han Junhoi Kim Lily Nari Kim Kibeom Kim Suk‐Heung Song Wook Park Sunghoon Kwon 《Advanced materials (Deerfield Beach, Fla.)》2015,27(12):2123-2123
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Yi Zhang Rui Huang Hongliang Li Zhenxu Lin Dejian Hou Yanqing Guo Jie Song Chao Song Zewen Lin Wenxing Zhang Jing Wang Paul K. Chu Chao Zhu 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(35)
Materials exhibiting persistent luminescence (PersL) have great prospect in optoelectronic and biomedical applications such as optical information storage, bio‐imaging, and so on. Unfortunately, PersL materials with multimode emission properties have been rarely reported, although they are expected to be very desirable in multilevel anti‐counterfeiting and encryption applications. Herein, Cr3+‐doped zinc aluminum germanium (ZAG:Cr) nanoparticles exhibiting triple‐mode emissions are designed and demonstrated. Upon exposure to steady 254 nm UV light, the ZAG:Cr nanoparticles yield steady bluish‐white emission. After turning off the UV light, the emission disappears quickly and the mode switches to transient near‐infrared (NIR) PersL emission at predominantly 690 nm. The transient NIR PersL emission which arises from Cr3+ is induced by non‐equivalent substitution of Ge4+. After persisting for 50 min, it can be retriggered by 980 nm photons due to the continuous trap depth distribution of ZAG:Cr between 0.65 and 1.07 eV. Inspired by the triple‐mode emissions from ZAG:Cr, multifunctional luminescent inks composed of ZAG:Cr nanoparticles are prepared, and high‐security labeling and encoding encryption properties are demonstrated. The results indicate that ZAG:Cr nanoparticles have great potential in anti‐counterfeiting and encryption applications, and the strategy and concept described here provide insights into the design of advanced anti‐counterfeiting materials. 相似文献
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Ze Zhao Huan Wang Luoran Shang Yunru Yu Fanfan Fu Yuanjin Zhao Zhongze Gu 《Advanced materials (Deerfield Beach, Fla.)》2017,29(46)
As an important characteristic of many creatures, structural colors play a crucial role in the survival of organisms. Inspired by these features, an intelligent structural color material with a heterogeneous striped pattern and stimuli‐responsivity by fast self‐assembly of colloidal nanoparticles in capillaries with a certain diameter range are presented here. The width, spacing, color, and even combination of the structural color stripe patterns can be precisely tailored by adjusting the self‐assembly parameters. Attractively, with the integration of a near‐infrared (NIR) light responsive graphene hydrogel into the structural color stripe pattern, the materials are endowed with light‐controlled reversible bending behavior with self‐reporting color indication. It is demonstrated that the striped structural color materials can be used as NIR‐light‐triggered dynamic barcode labels for the anti‐counterfeiting of different products. These features of the bioinspired structural color stripe pattern materials indicate their potential values for mimicking structural color organisms, which will find important applications in constructing intelligent sensors, anti‐counterfeiting devices, and so on. 相似文献
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Yongjoon Heo Hyelim Kang Joon‐Seok Lee You‐Kwan Oh Shin‐Hyun Kim 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(28):3819-3826
Colloidal photonic crystals possess inimitable optical properties of iridescent structural colors and unique spectral shape, which render them useful for security materials. This work reports a novel method to encrypt graphical and spectral codes in polymeric inverse opals to provide advanced security. To accomplish this, this study prepares lithographically featured micropatterns on the top surface of hydrophobic inverse opals, which serve as shadow masks against the surface modification of air cavities to achieve hydrophilicity. The resultant inverse opals allow rapid infiltration of aqueous solution into the hydrophilic cavities while retaining air in the hydrophobic cavities. Therefore, the structural color of inverse opals is regioselectively red‐shifted, disclosing the encrypted graphical codes. The decoded inverse opals also deliver unique reflectance spectral codes originated from two distinct regions. The combinatorial code composed of graphical and optical codes is revealed only when the aqueous solution agreed in advance is used for decoding. In addition, the encrypted inverse opals are chemically stable, providing invariant codes with high reproducibility. In addition, high mechanical stability enables the transfer of the films onto any surfaces. This novel encryption technology will provide a new opportunity in a wide range of security applications. 相似文献
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Kai Jiang Sizhe Hu Yuci Wang Zhongjun Li Hengwei Lin 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(31)
Single‐component multicolor luminescence, particularly phosphorescence materials are highly attractive both in numerous applications and in‐depth understanding the light‐emission processes, but formidable challenges still exist for preparing such materials. Herein, a very facile approach is reported to synthesize carbon dots (CDs) (named MP‐CDs) that exhibit multicolor fluorescence (FL), and more remarkably, multicolor long‐lived room temperature phosphorescence (RTP) under ambient conditions. The FL and RTP colors of the CDs powder are observed to change from blue to green and cyan to yellow, respectively, with the excitation wavelength shifting from 254 to 420 nm. Further studies demonstrate that the multicolor emissions can be attributed to the existence of multiple emitting centers in the CDs and the relatively higher reaction temperature plays a critical role for achieving RTP. Given the unique optical properties, a preliminary application of MP‐CDs in advanced anti‐counterfeiting is presented. This study not only proposes a strategy to prepare photo‐stimulated multicolor RTP materials, but also reveals great potentials of CDs in exploiting novel optical materials with unique properties. 相似文献
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Guosheng Tang Long Chen Zixuan Wang Shuting Gao Qingli Qu Ranhua Xiong Kevin Braeckmans Stefaan C. De Smedt Yu Shrike Zhang Chaobo Huang 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(24)
Barcodes have attracted widespread attention, especially for the multiplexed bioassays and anti‐counterfeiting used toward medical and biomedical applications. An enabling gas‐shearing approach is presented for generating 10‐faced microspherical barcodes with precise control over the properties of each compartment. As such, the color of each compartment could be programmatically adjusted in the 10‐faced memomicrospheres by using pregel solutions containing different combinations of fluorescent nanoparticles. During the process, three primary colors (red, green, and blue) are adopted to obtain up to seven merged fluorescent colors for constituting a large amount of coding as well as a magnetic compartment, capable of effective and robust high‐throughput information‐storage. More importantly, by using the biocompatible sodium alginate to construct the multicolor microspherical barcodes, the proposed technology is likely to advance the fields of food and pharmaceutics anti‐counterfeiting. These remarkable properties point to the potential value of gas‐shearing in engineering microspherical barcodes for biomedical applications in the future. 相似文献
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Hai Huang Jiangkun Chen Yutong Liu Jidong Lin Shaoxiong Wang Feng Huang Daqin Chen 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(19)
The development of luminescent materials with concurrent multimodal emissions is a great challenge to improve security and data storage density. Lanthanide‐doped nanocrystals are particularly appropriate for such applications for their abundant intermediate energy states and distinguishable spectroscopic profiles. However, traditional lanthanide luminescent nanoparticles have a limited capacity for information storage or complexity to shield against counterfeiting. Herein, it is demonstrated that the combination of upconverting and downshifting emissions in a particulate designed lanthanide‐doped core@multishell nanoarchitecture allows the generation of multicolor dual‐modal luminescence over a wide spectral range for complex information storage. Precise control of lanthanide dopants distribution in the core and distinct shells enables simultaneous excitation of 980/808 nm focusing/defocusing laser and 254 nm light and produces complex upconverting emissions from Er, Tm, Eu, and Tb via multiphoton energy transfer processes and downshifting emissions from Eu and Tb via efficient energy transfer from Ce to Eu/Tb in Gd‐assisted lattices. It is experimentally proven that multiple visualized anti‐counterfeit and information encryption with facile decryption and authentication using screen‐printing inks containing the present core@multishell nanocrystals are practically applicable by selecting different excitation modes. 相似文献
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Liping Tong Wei Qi Mengfan Wang Renliang Huang Rongxin Su Zhimin He 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(25):3433-3443
It is broadly observed that graphene oxide (GO) films appear transparent with a thickness of about several nanometers, whereas they appear dark brown or almost black with thickness of more than 1 μm. The basic color mechanism of GO film on a sub‐micrometer scale, however, is not well understood. This study reports on GO pseudo‐1D photonic crystals (p1D‐PhCs) exhibiting tunable structural colors in the visible wavelength range owing to its 1D Bragg nanostructures. Striking structural colors of GO p1D‐PhCs could be tuned by simply changing either the volume or concentration of the aqueous GO dispersion during vacuum filtration. Moreover, the quantitative relationship between thickness and reflection wavelength of GO p1D‐PhCs has been revealed, thereby providing a theoretical basis to rationally design structural colors of GO p1D‐PhCs. The spectral response of GO p1D‐PhCs to humidity is also obtained clearly showing the wavelength shift of GO p1D‐PhCs at differently relative humidity values and thus encouraging the integration of structural color printing and the humidity‐responsive property of GO p1D‐PhCs to develop a visible and fast‐responsive anti‐counterfeiting label. The results pave the way for a variety of potential applications of GO in optics, structural color printing, sensing, and anti‐counterfeiting. 相似文献
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Perovskite Solar Cells: Moth‐Eye TiO2 Layer for Improving Light Harvesting Efficiency in Perovskite Solar Cells (Small 18/2016) 下载免费PDF全文
下载免费PDF全文 Seong Min Kang Segeun Jang Jong‐Kwon Lee Jungjin Yoon Dong‐Eun Yoo Jin‐Wook Lee Mansoo Choi Nam‐Gyu Park 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(18):2530-2530
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Stencil lithography (SL), which uses a perforated membrane as a reusable shadow mask to locally add material patterns on substrates provides a simple but versatile approach for the fabrication of functional devices on a large variety of substrate materials by physical vapor deposition (PVD). Mechanical stress induced by the accumulation of condensed material on the thin stencil membrane during the PVD step leads to stencil bending and breaking, therefore, suspended stencil membranes with arbitrary openings are, in practice, not possible. Here, a new approach to remedy this limitation is reported by introducing auxiliary bridges in stencils. These bridges prevent the suspended membrane from bending out of plane, thereby enabling aperture openings to have almost arbitrary geometry. These bridges are sufficiently narrow so that they do not entirely block the material deposition by PVD and thus create a continuous material pattern by taking advantage of the blurring effect. The successful metal deposition through the designed nanobridge stencil on a wide range of substrate materials underlines the usability and the versatility of the proposed stencil design. The work presented here provides a versatile fabrication method to produce arbitrarily shaped metal patterns that were previously impossible due to the topological constraints of nanostencils. 相似文献
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Mianqi Xue Xiaojing Cai Ghenfu Chen 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(5):548-552
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红外热释电探测器的微图形化研究 总被引：4，自引：0，他引：4
红外热释电探测器的关键是敏感元的研制，而敏感元主要是由具有一定图形的铁电薄膜和上下电极构成。采用半导体光刻工艺，利用化学腐蚀法成功地对PZT铁电薄膜进行了刻蚀，同时采用剥离技术对相应的电极实现了图形化。 相似文献