Shape-Controlled and Well-Arrayed Heterogeneous Nanostructures via Melting Point Modulation at the Nanoscale

Zhao, Zhi‐Jun; Ahn, Junseong; Ko, Jiwoo; Jeong, Yongrok; Bok, Moonjeong; Hwang, Sung Hwan; Kang, Hyeok-Joong; Jeon, Sohee; Choi, Jeong‐Woo; Park, Inkyu; Jeong, Jun‐Ho

doi:10.1021/acsami.0c18122

Cited by 19 publications

(23 citation statements)

References 46 publications

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“…The detailed fabrication of the polymer mold from the Si master was described in a previous work. [42,43] The surface of the Si master had to be treated with trichloro(1H,1H,2H,2H-perfluorooctyl)silane to facilitate polymer mold detachment. Then, the nanopatterned PUA mold was used to pattern the PMMA film at 110 °C (i.e., at a temperature above the T g of PMMA) and 5 bar for 10 min.…”

Section: Methodsmentioning

confidence: 99%

All‐Recyclable Triboelectric Nanogenerator for Sustainable Ocean Monitoring Systems

Ahn

Kim

Jeong

et al. 2022

Advanced Energy Materials

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The growing severity of environmental problems such as plastic waste and climate change has inspired active research into solutions based on recyclable and renewable energy devices. Triboelectric nanogenerators (TENGs) that convert wasted mechanical energy into electrical energy offer a solution that needs to be made recyclable to reduce or eliminate the generation of electronic waste (e‐waste) on their disposal. In this study, an all‐recyclable TENG (AR‐TENG) based on a thermoplastic polymer with a nanohole pattern is developed; it delivers an excellent output power density of 1.547 W m−2 (peak output voltage = 360 V, current = 22 µA) and shows superior mechanochemical stability by maintaining its performance after immersion into seawater or 1 000 000 cyclic tests. The practical utility of this AR‐TENG is demonstrated through its use to power a buoy‐type ocean monitoring system and an intelligent life jacket, whereas recyclability is demonstrated by the re‐fabrication of the AR‐TENG; reusability in other devices is validated by the successful fabrication of a plasmonic color filter. This work paves the way for the efficient harvesting of renewable energy without the concomitant production of e‐waste; therefore, it contributes to the mitigation of global environmental problems such as global warming and ozone depletion.

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Section: Methodsmentioning

confidence: 99%

All‐Recyclable Triboelectric Nanogenerator for Sustainable Ocean Monitoring Systems

Ahn

Kim

Jeong

et al. 2022

Advanced Energy Materials

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“…The detailed fabrication process of the polymer mold from the Si master is described in our previous report. [31,32] Note that the surface of the Si master and PUA had to be treated with trichloro(1H, 1H, 2H, 2H-perfluorooctyl)silane to facilitate the detachment of the polymer mold and PDMS.…”

Section: Methodsmentioning

confidence: 99%

Spherical Micro/Nano Hierarchical Structures for Energy and Water Harvesting Devices

et al. 2022

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features of components in these structures can engender a synergistic effect on the physicochemical properties of the entire structure and the outstanding properties of their constitutive building blocks. For example, inspired by the 3D hierarchical structure of the gecko's feet, which enables them to climb various textured surfaces, such as concrete and glass, surfaces with strong adhesion have been widely used. [3,4] In addition, the micro/nanoscale hierarchical structures inspired by the lotus plant, which impart self-cleaning properties, prevent the adhesion of rain on windows, antennas, and solar cells, thereby maintaining their performance in harsh environments. [5] Research on the micro/ nano hierarchical structures has facilitated their applications to chemical sensors, [6] fuel cells, [7] and self-cleaning systems [8] owing to their increased surface areas and roughness. In particular, micro/nano hierarchical structures are suitable for these applications because they bolster the advantages of micro-and nanostructures. Typically, microstructures can be used to adjust mechanical properties such as the hardness and elastic modulus. [9] Nanostructures also exhibit characteristics such as hydrophobicity and increased surface area. [10,11] Well-designed and adjustable micro/nano hierarchical structures can be applied to harvesting systems, such as triboelectric generators and water harvesting devices with high performance through controlled mechanical properties and increased surface area. [12,13] Therefore, it is essential to fabricate well-designed hierarchical structures that can be manufactured by means of a low-cost process for applications in engineering fields.Several methods have been suggested for manufacturing micro/nano hierarchical structures on surfaces, including semiconductor fabrication processes, [14] molding and imprinting, [15] chemical synthesis, [16] and etching. [17] In particular, various methods have been proposed for fine-tuning the geometric features at different levels with high precision. For example, Tian et al. proposed hierarchically ordered structures using an electrohydrodynamic structure formation method based on a prestructured polymer under an applied electric field. [18] Lin et al. proposed superhydrophobic surfaces based on hierarchical structures using two-photon polymerization. [19] These methods are effective for fabricating complex micro/nano hierarchical structures on flexible substrates. However, these Three-dimensional (3D) hierarchical structures have been explored for various applications owing to the synergistic effects of micro-and nanostructures. However, the development of spherical micro/nano hierarchical structures (S-HSs), which can be used as energy/water harvesting systems and sensing devices, remains challenging owing to the trade-off between structural complexity and fabrication difficulty. This paper presents a new strategy for facile, scalable S-HS fabrication using a thermal expansion of microspheres and nanopatterned structures. When a specific tem...

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“…The counterfeiting of such masks may affect not only hospitals and medical staff who work directly with covid-19 patients but also citizens who inadvertently purchase them. The US Department of Homeland Security made significant efforts to recover counterfeit N95 masks to combat counterfeiting 56 , 57 . Anti-counterfeiting (AC) efforts were required by the use of cutting-edge technologies to spot forgeries.…”

Section: Introductionmentioning

confidence: 99%

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Lavanya

Darshan

Malleshappa

et al. 2022

Sci Rep

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Engineering a single material with multidirectional applications is crucial for improving productivity, low cost, flexibility, least power consumption, etc. To achieve these requirements, novel design structures and high-performance materials are in urgent need. Lanthanide-doped nanophosphors have the greatest strengths and ability in order to tune their applications in various dimensions. However, applications of nanophosphor in latent fingerprints visualization, anti-counterfeiting, and luminescent gels/films are still in their infancy. This study demonstrated a simple strategy to enhance the luminescence of Tb3+ (1–11 mol %) doped La2Zr2O7 nanophosphors by conjugating various fluxes via a simple solution combustion route. The photoluminescence emission spectra reveal intense peaks at ~ 491, 546, 587, and 622 nm, which arises from 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions, respectively. The highest emission intensity was achieved in the NH4Cl flux assisted nanophosphor as compared to NaBr and NH4F assisted samples. The colorimetric images of fingerprints visualized using the optimized nanophosphor on forensic related surfaces exhibit level –III ridge details, including sweat pores, the width of the ridges, bifurcation angle, and the successive distance between sweat pores, etc. These results are decisive parameters that clearly support the statement “no two persons have ever been found to have the same fingerprints”. The anti-counterfeiting security ink was formulated using optimized nanophosphor and various patterns were designed by simple screen printing and dip pen technologies. The encoded information was decrypted only under ultraviolet 254 nm light. All the designed patterns are exhibit not just what it looks/feel like and how better it works. As a synergetic contribution of enhanced luminescence of the prepared nanophosphor, the green-emissive films were fabricated, which display excellent flexibility, uniformity, and transparency in the normal and ultraviolet 254 nm light illumination. The aforementioned results revealed that the prepared NH4Cl flux-assisted La2Zr2O7: Tb3+(7 mol %) NPs are considered to be the best candidate for multi-dimensional applications.

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Shape-Controlled and Well-Arrayed Heterogeneous Nanostructures via Melting Point Modulation at the Nanoscale

Cited by 19 publications

References 46 publications

All‐Recyclable Triboelectric Nanogenerator for Sustainable Ocean Monitoring Systems

All‐Recyclable Triboelectric Nanogenerator for Sustainable Ocean Monitoring Systems

Spherical Micro/Nano Hierarchical Structures for Energy and Water Harvesting Devices

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

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