In Situ Chemical Patterning Technique

Guan, Yuduo; Ai, Bin; Wang, Zengyao; Chen, Chong; Zhang, Wei; Wang, Yu; Zhang, Gang

doi:10.1002/adfm.202107945

Cited by 16 publications

(12 citation statements)

References 51 publications

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“…This commercial inkjet printer's theoretical printing speed is up to 15 pages per minute (four orders of magnitude improvement versus a precise inkjet printer. The results can lead to large‐format fluorescent patterns for anti‐counterfeiting faster than other patterning technologies, e.g., screen printing, [ 51 ] lithography, [ 52 ] and precise printing [ 11 ] ).…”

Section: Resultsmentioning

confidence: 99%

Flash Nanoprecipitation Offers Large‐Format Full‐Color and Dual‐Mode Fluorescence Patterns for Codes‐in‐Code Encryption and Anti‐Counterfeiting

Gao

Wang

Zhang

et al. 2022

Advanced Photonics Research

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Fluorescent materials have drawn considerable attention and application in encryption and anti-counterfeiting, including currency, passports, identity cards, and other secure documents. They have high concealment and tunable optical properties. [1][2][3] However, most fluorescent materials can only be patterned by screen printing because of their high viscosity-this leads to several shortcomings, including immutable patterns and lack of response. [4][5][6] Plus, the information encrypted by single-mode anti-counterfeiting technology is more easily accessible, reducing security and limiting anti-counterfeiting applications. [7,8] Ultra-micro fluorescent patterns can encrypt larger amounts of information per surface area, thus preventing forgery. [9] Liu et al. integrated ultra-micro fluorescent patterns with deep learning for high-level anti-counterfeiting. These patterns are physically unclonable. [10] The group also printed a quick response (QR) code anchor with various ultra-micro fonts to distinguish authenticity without affecting information decryption. [11] However, these ultra-micro fluorescent patterns' encoding and decoding processes require a microscope to observe and identify feature areas, thus severely hindering practical applications. [12] Natural color contrast has inspired encryption and can lead to a facile approach to encryption and anti-counterfeiting. [13,14] Chang et al. used conjugated polymer dots to fabricate diverse full-color fluorescent patterns for storing more encrypted information. [15] However, these full-color fluorescent patterns could be observed directly under a single wavelength UV light; the encrypted information may leak. [16,17] External stimuli are emerging as an attractive condition for developing reconfigurable and programmable nanomaterials. [18] Stimulus-responsive Researchers have constructed innovative stimulus-responsive patterns for high-security anti-counterfeiting based on the material's properties, e.g., photochromic, [19][20][21][22][23] thermochromic, [24][25][26] hydrochromic, [27,28] ionchromic [29,30] and mechanochromic [31] materials. These stimuli-responsive fluorescent patterns exhibit high security because they can only be seen under specific external stimuli. [32,33] However, considerable issues remain to be addressed, including low response speeds and poor durability. [34]

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Section: Resultsmentioning

confidence: 99%

Flash Nanoprecipitation Offers Large‐Format Full‐Color and Dual‐Mode Fluorescence Patterns for Codes‐in‐Code Encryption and Anti‐Counterfeiting

Gao

Wang

Zhang

et al. 2022

Advanced Photonics Research

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“…The graphic pattern is usually formed during the synthesis or through the arrangement of the prepared nanoparticles by the methods of electrodeposition, [66] lithography, [21,67] the superhydrophobic/superhydrophilic transformation, [63] and so on. The arrangement of the pattern after synthesis can be obtained by the inkjet print [68] and so on.…”

Section: D and 3d Pattern Labelsmentioning

confidence: 99%

“…Guan et al prepared Ag NPs-assembly arrays with controllable morphology from nanoring to nanodisk by in situ chemical patterning technology (shown in Figure 4A). [67] Combining with conventional photolithography, letters and patterns in the range of macroscopic to sub-microscale for SERS images code were accurately obtained (Figure 4B) on PDMS and curved glass, respectively. The letters "a" and "P" were generated from the SERS imaging on the characteristic vibration of R6G and MB at 1361 and 1624 cm −1 , respectively (Figure 4C).…”

Section: D and 3d Pattern Labelsmentioning

confidence: 99%

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SERS Labels for Optical Anticounterfeiting: Structure, Fabrication, and Performance

Sun

Lou

Liu

et al. 2023

Advanced Optical Materials

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Counterfeiting is a global longstanding problem that causes significant negative impact on a wide range of products from banknotes, valuable documents, medicine, luxury to common consumer goods, endangering the economy, safety, and human health, etc. [1][2][3][4] A variety of anticounterfeiting techniques have been developed, such as those based on hologram, watermarks, radio-frequency identification, structural color, graphic code, molecular tag, physical unclonable, fluorescence, surface-enhanced Raman scattering (SERS), and so on. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The actual benefits and practicality of the anticounterfeiting techniques are strongly affected by comprehensive factors including the safety index, capacity, stability, readability, manufacturing, and cost, etc. Each anticounterfeiting technique has its own advantages and limitations, as shown in Figure S1 in the Supporting Information, and to fit all the required factors mentioned above remains a great challenge. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Considering the most important parameter-encoding capacity, the two molecular tag [15,16,19] and SERS [5,6,[19][20][21] anticounterfeiting techniques related to molecular information and the physical unclonable technique related to the spatial random distribution of the particles, which are difficult to forge and have a higher tolerance to errors, show great advantages. Compared with fluorescence labels, SERS labels can be verified by SERS spectra with narrower fingerprint bands under the excitation at different wavelengths; [22][23][24] moreover, SERS labels exhibit superior photostability due to the extremely short lifetimes of Raman scattering which can inhibit photo-bleaching, energy transfer, or quenching of the probe molecules in the excited states. [6,[22][23][24][25] In general, among the various anticounterfeiting techniques, SERS-based anticounterfeiting stands out in recent years, not only due to its higher information capacity and higher safety index, but also due to its excellent comprehensive performance. [20,21] Raman scattering, resulting from the vibrational signatures of molecules, was discovered in the 1920s by the Indian physicist C.V. Raman. [26,27] In recent years, SERS has become a commonly used sensing technique in various fields including anticounterfeiting, in which inelastic light scattering (Figure 1) by molecules can be dramatically enhanced by a factor of 10 6 to 10 14 when the molecules are adsorbed onto rough metal surfaces such as Au or Ag or Cu nanoparticles (NPs). [26][27][28] In general, two main mechanisms for Raman enhancement are recognized by researchers. The first mechanism is the most Developing new anticounterfeit technologies with good robustness, high safety index, strong readability, and low cost is highly demanded but challenging. In recent years, anticounterfeiting labels by surface-enhanced Raman spectroscopy (SERS) have drawn great attention due to the molecular encoding, highly accurate identification, large codi...

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“…Scientists have created unique SERS patterns that utilize the Raman reporters in the SERS labels over an area ranging from nanometer to centimeter‐scale. [ 22,27,97 ] In this section, we will present some examples of anti‐counterfeit labels with macro‐ or microscale SERS patterns, and show how researchers utilized many of their unique features for anti‐counterfeiting applications.…”

Section: Sers‐based Anti‐counterfeit Labelsmentioning

confidence: 99%

Recent Progress in SERS‐Based Anti‐counterfeit Labels

Huo

Yang

Wilson

et al. 2022

Adv Materials Inter

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Anti‐counterfeit labels protect many commercial goods, drugs, and currencies from counterfeiting activities. Recently, the designs of anti‐counterfeit labels have emerged utilizing surface‐enhanced Raman scattering (SERS) as a powerful technique, in which SERS‐active materials provide strong Raman signals of probe molecules. These signals are unique and, so far, have rarely been used in practical anti‐counterfeit labels applications. In this review, the general methodology of using Raman and SERS in designing anti‐counterfeit labels is first introduced. Then, two types of secret information in SERS labels, spectroscopic information and graphical information, are detailed and discussed with a focus on how the molecular information is encoded with SERS labels. Later, several advanced SERS labels are presented which combine existing security features such as barcode, quick response code, fluorescence, and unclonable features. Finally, the challenges in building usable SERS anti‐counterfeit labels are discussed and possible research directions are described.

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In Situ Chemical Patterning Technique

Cited by 16 publications

References 51 publications

Flash Nanoprecipitation Offers Large‐Format Full‐Color and Dual‐Mode Fluorescence Patterns for Codes‐in‐Code Encryption and Anti‐Counterfeiting

Flash Nanoprecipitation Offers Large‐Format Full‐Color and Dual‐Mode Fluorescence Patterns for Codes‐in‐Code Encryption and Anti‐Counterfeiting

SERS Labels for Optical Anticounterfeiting: Structure, Fabrication, and Performance

Recent Progress in SERS‐Based Anti‐counterfeit Labels

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