Dynamic multimodal holograms of conjugated organogels via dithering mask lithography

Oh, Jongwon; Baek, Daehye; Lee, Tae Kyung; Kang, Dong‐Won; Hwang, Hyeri; Go, Eun Min; Jeon, Inkyu; You, Younghoon; Son, Changil; Kim, Dowon; Whang, Minji; Nam, K. B.; Jang, Moonjeong; Park, Jung Hoon; Kwak, Sang Kyu; Kim, Jung-Wook; Lee, Jiseok

doi:10.1038/s41563-020-00866-4

Cited by 40 publications

(26 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The heights, widths, and pitches of the Ormostamp cuboids can be determined by the strain loaded on the PDMS relief. In addition to the UV-curable transparent Ormostamp resin, the stretchable PDMS reliefs are expected to be used in patterning functional materials, such as hydrogels, [24,59,60] organogels, [18] shape-memory polymers, [61,62] and high-refractive-index resins, [63] with programmed structures.…”

Section: Resultsmentioning

confidence: 99%

“…We believe the flexible reliefs will find applications in steganography, soft lithography, and directional strain sensing. Portable imaging devices [18,64] can be used for recording the optical microscopy images of the reliefs, which will further promote the practical applications. High-throughput TPL with a parallel printing technique [65] can also be used to fabricate larger samples for direct observation with the naked eye.…”

Section: Discussionmentioning

confidence: 99%

“…Compared to pigments and dyes, structural colors are potentially fade-resistant and possess unprecedented print resolution. [13][14][15][16] Reversible tuning of structural colors can be achieved by various external stimuli, including but not limited to gases, [17] solvents, [18] light, [19] temperature changes, [20] voltage biases, [21,22] magnetic fields, [23,24] and mechanical forces. [25,26] Flexible elastomers, especially inert, optically transparent, thermally stable and biologically compatible poly(dimethylsiloxane) (PDMS), [27][28][29] are excellent materials for realizing reversible mechanochromic effects.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Reconfiguring Colors of Single Relief Structures by Directional Stretching

et al. 2021

View full text Add to dashboard Cite

Color changes can be achieved by straining photonic crystals or gratings embedded in stretchable materials. However, the multiple repeat units and the need for a volumetric assembly of nanostructures limit the density of information content. Inspired by surface reliefs on oracle bones and music records as a means of information archival, here, surface‐relief elastomers are endowed with multiple sets of information that are accessible by mechanical straining along in‐plane axes. Distinct from Bragg diffraction effects from periodic structures, trenches that generate color due to variations in trench depth, enabling individual trench segments to support a single color, are reported. Using 3D printed cuboids, trenches of varying geometric parameters are replicated in elastomers. These parameters determine the initial color (or lack thereof), the response to capillary forces, and the appearance when strained along or across the trenches. Strain induces modulation in trench depth or the opening and closure of a trench, resulting in surface reliefs with up to six distinct states, and an initially featureless surface that reveals two distinct images when stretched along different axes. The highly reversible structural colors are promising in optical data archival, anti‐counterfeiting, and strain‐sensing applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Reconfiguring Colors of Single Relief Structures by Directional Stretching

et al. 2021

View full text Add to dashboard Cite

show abstract

“…A unique class of hydrogel-based smart materials, outside the category of sensors and actuators, is hydrogel taggant for encryption [ 20 , 175 ] or anti-counterfeiting purposes [ 176 ]. Unlike the conventional encoded particles we introduced above where codes are deterministic and overt, these taggants have embedded codes for covert operations sch as encryption and authentication to prevent information hacking and product counterfeiting, respectively.…”

Section: Inorganic Additivesmentioning

confidence: 99%

Recent Advances in Polymer Additive Engineering for Diagnostic and Therapeutic Hydrogels

Bae

Kim

Kwon

2022

IJMS

View full text Add to dashboard Cite

Hydrogels are hydrophilic polymer materials that provide a wide range of physicochemical properties as well as are highly biocompatible. Biomedical researchers are adapting these materials for the ever-increasing range of design options and potential applications in diagnostics and therapeutics. Along with innovative hydrogel polymer backbone developments, designing polymer additives for these backbones has been a major contributor to the field, especially for expanding the functionality spectrum of hydrogels. For the past decade, researchers invented numerous hydrogel functionalities that emerge from the rational incorporation of additives such as nucleic acids, proteins, cells, and inorganic nanomaterials. Cases of successful commercialization of such functional hydrogels are being reported, thus driving more translational research with hydrogels. Among the many hydrogels, here we reviewed recently reported functional hydrogels incorporated with polymer additives. We focused on those that have potential in translational medicine applications which range from diagnostic sensors as well as assay and drug screening to therapeutic actuators as well as drug delivery and implant. We discussed the growing trend of facile point-of-care diagnostics and integrated smart platforms. Additionally, special emphasis was given to emerging bioinformatics functionalities stemming from the information technology field, such as DNA data storage and anti-counterfeiting strategies. We anticipate that these translational purpose-driven polymer additive research studies will continue to advance the field of functional hydrogel engineering.

show abstract

“…[37] Very recently, the modulation of the fluorescence intensity and lifetime for perovskite nanocrystals via metasurfaces has been demonstrated as a novel method of PUF fabrication. [38] As far as fluorescent materials are concerned for the fabrication of PUF-based encoded surfaces, rationally designed π-conjugated organic semiconductors [39][40][41] could be a highly attractive material family based on their ease of synthesis and structural modification, high photoluminescence efficiency, solution-processability to form thin-films, and fingerprint-like spectral information. Precise control and tuning over their chemical structures, physicochemical (e.g., thermal transitions or solubility in a specific solvent) and photophysical (e.g., absorption/emission maxima, optical band edge, or excitedstate lifetime) properties are possible to meet the specific needs of a particular application.…”

Section: Introductionmentioning

confidence: 99%

Organic Light‐Emitting Physically Unclonable Functions

Kayacı

Özdemir

Kalay

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

The development of novel physically unclonable functions (PUFs) is of growing interest and fluorescent organic semiconductors (f‐OSCs) offer unique advantages of structural versatility, solution‐processability, ease of processing, and great tuning ability of their physicochemical/optoelectronic/spectroscopic properties. The design and ambient atmosphere facile fabrication of a unique organic light‐emitting physically unclonable function (OLE‐PUF) based on a green‐emissive fluorescent oligo(p‐phenyleneethynylene) molecule is reported. The OLE‐PUFs have been prepared by one‐step, brief (5 min) thermal annealing of spin‐coated nanoscopic films (≈40 nm) at a modest temperature (170 °C), which results in efficient surface dewetting to form randomly positioned/sized hemispherical features with bright fluorescence. The random positioning of molecular domains generated the unclonable surface with excellent uniformity (0.50), uniqueness (0.49), and randomness (p > 0.01); whereas the distinctive photophysical and structural properties of the molecule created the additional security layers (fluorescence profile, excited‐state decay dynamics, Raman mapping/spectrum, and infrared spectrum) for multiplex encoding. The OLE‐PUFs on substrates of varying chemical structures, surface energies and flexibility, and direct deposition on goods via drop‐casting are demonstrated. The OLE‐PUFs immersed in water, exposed to mechanical abrasion, and read‐out repeatedly via fluorescence imaging showed great stability. These findings clearly demonstrate that rationally engineered solution‐processable f‐OSCs have a great potential to become a key player in the development of new‐generation PUFs.

show abstract

Dynamic multimodal holograms of conjugated organogels via dithering mask lithography

Cited by 40 publications

References 47 publications

Reconfiguring Colors of Single Relief Structures by Directional Stretching

Reconfiguring Colors of Single Relief Structures by Directional Stretching

Recent Advances in Polymer Additive Engineering for Diagnostic and Therapeutic Hydrogels

Organic Light‐Emitting Physically Unclonable Functions

Contact Info

Product

Resources

About