Silver nanoflowers with SERS activity and unclonable morphology

Sakir, Menekse; Torun, Neslihan; Kayacı, Nilgün; Torun, Ilker; Kalay, Mustafa; Önses, M. Serdar

doi:10.1016/j.mtchem.2023.101423

Cited by 9 publications

(7 citation statements)

References 57 publications

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“…[ 42 ] The presented approach herein is facile, controllable, and fast, which has great potential for vast micro/nanostructure fabrication and encoding applications. [ 42,43,46,47 ]…”

Section: Resultsmentioning

confidence: 99%

Surface Nanodroplet‐Confined Engineering of Gold (I) ‐Thiolate Nanostructures

Yu,

Li,

Dyett

et al. 2024

Adv Materials Inter

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Gold(I)‐thiolate complexes have served as primary building blocks for diverse Au nanostructure synthesis strategies. A delicate approach to characterize and control Au(I)‐thiolate motif formation and assembly on the surface is needed as it can potentially solve challenges associated with utilizing gold nanomaterials in many applications. Here, the controllable generation of flower‐shaped surface gold nanostructures (FSGNs) is demonstrated by manipulating the formation‐assembly process of Au(I)‐dodecanethiolate motifs within nanoscale surface droplets. The morphology and structure of the resulting Au nanostructures are governed by internal convection flows and interfacial energy, modulated by the nanodroplet composition and substrate wettability. The obtained FSGNs are proven to act as versatile scaffolds for the selective generation of Au spiky nanostars. These FSGNs can also be utilized to functionalize nanodroplet‐based reactors, boosting the fluorescent intensity of Nile red (NR) fluorophores and decomposing NR via catalytic reaction. Remarkably, with FSGN functionalized droplets smaller than a radius of 500 nm, the decomposition rate of NR can reach ≈0.01 s−1. These results highlight a miniaturized, controllable, and automated method for the in situ production of 3D gold nanostructures on substrates, offering prospects for fast surface nanostructure fabrication and efficient environmental pollutant treatment.

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“…[ 42 ] The presented approach herein is facile, controllable, and fast, which has great potential for vast micro/nanostructure fabrication and encoding applications. [ 42,43,46,47 ]…”

Section: Resultsmentioning

confidence: 99%

Surface Nanodroplet‐Confined Engineering of Gold (I) ‐Thiolate Nanostructures

Yu,

Li,

Dyett

et al. 2024

Adv Materials Inter

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“…Unclonable features can also be directly authenticated by using feature detection algorithms without the need for binary key generation. This approach offers several advantages, including fast processing, marker-less authentication, and the ability to authenticate complex features. ,– PUF labels were imaged under varied illumination, rotation, and magnification conditions (Figure ). The feature detection algorithms oriented FAST and rotated BRIEF (ORB) , were used to identify images.…”

Section: Resultsmentioning

confidence: 99%

Food-Grade Physically Unclonable Functions

Esidir,

Kayaci,

Kiremitler

et al. 2023

ACS Appl. Mater. Interfaces

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Counterfeit products in the pharmaceutical and food industries have posed an overwhelmingly increasing threat to the health of individuals and societies. An effective approach to prevent counterfeiting is the attachment of security labels directly on drugs and food products. This approach requires the development of security labels composed of safely digestible materials. In this study, we present the fabrication of security labels entirely based on the use of food-grade materials. The key idea proposed in this study is the exploitation of food-grade corn starch (CS) as an encoding material based on the microscopic dimensions, particulate structure, and adsorbent characteristics. The strong adsorption of a food colorant, erythrosine B (ErB), onto CS results in fluorescent CS@ErB microparticles. Randomly positioned CS@ErB particles can be obtained simply by spin-coating from aqueous solutions of tuned concentrations followed by transfer to an edible gelatin film. The optical and fluorescence microscopy images of randomly positioned particles are then used to construct keys for a physically unclonable function (PUF)-based security label. The performance of PUFs evaluated by uniformity, uniqueness, and randomness analysis demonstrates the strong promise of this platform. The biocompatibility of the fabricated PUFs is confirmed with assays using murine fibroblast cells. The extremely low-cost and sustainable security primitives fabricated from off-the-shelf food materials offer new routes in the fight against counterfeiting.

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“…[46,47] This algorithm directly compares images taken at different positions, under different magnifications, and with different contrasts from any emission layer of the label with the complex images stored in the database. [28,41,[48][49][50] Figure 5 provides several application examples of this image matching process. Fluorescence images acquired at the same magnification and position from different time periods of authentic PUFs are readily correlated to their corresponding counterparts in the database, as depicted in Figure 5a.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tattoo‐Like Multi‐Color Physically Unclonable Functions

Kiremitler,

Esidir,

Drake

et al. 2023

Advanced Optical Materials

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Advanced anti‐counterfeiting and authentication approaches are in urgent need of the rapidly digitizing society. Physically unclonable functions (PUFs) attract significant attention as a new‐generation security primitive. The challenge is design and generation of multi‐color PUFs that can be universally applicable to objects of varied composition, geometry, and rigidity. Herein, tattoo‐like multi‐color fluorescent PUFs are proposed and demonstrated. Multi‐channel optical responses are created by electrospraying of polymers that contain semiconductor nanocrystals with precisely defined photoluminescence. The universality of this approach enables the use of dot and dot‐in‐rod geometries with unique optical characteristics. The fabricated multi‐color PUFs are then transferred to a target object by using a temporary tattoo approach. Digitized keys generated from the red, green and blue fluorescence channels facilitate large encoding capacity and rapid authentication. Feature matching algorithms complement the authentication by direct image comparison, effectively alleviating constraints associated with imaging conditions. The strategy that paves the way for the development of practical, cost‐effective, and secure anticounterfeiting systems is presented.

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Silver nanoflowers with SERS activity and unclonable morphology

Cited by 9 publications

References 57 publications

Surface Nanodroplet‐Confined Engineering of Gold (I) ‐Thiolate Nanostructures

Surface Nanodroplet‐Confined Engineering of Gold (I) ‐Thiolate Nanostructures

Food-Grade Physically Unclonable Functions

Tattoo‐Like Multi‐Color Physically Unclonable Functions

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