Heterogeneous Nanostructures Fabricated via Binding Energy-Controlled Nanowelding

Zhao, Zhi‐Jun; Gao, Min; Hwang, Soonhyoung; Jeon, Sohee; Park, Inkyu; Park, Sang-Hu; Jeong, Jun‐Ho

doi:10.1021/acsami.8b18405

Cited by 10 publications

(7 citation statements)

References 67 publications

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“…The junction of the second and third Au layer can be observed in the HRTEM images (see Figure S4b-(3 and 4)). In previous studies, 3D metal nanostructures were developed via nanowelding technology. , However, the polymer mold had to be fabricated on PET or PMMA substrates using nanoimprinting resin. Therefore, defects could appear in the 3D metal nanostructures while fabricating the multilayer nanostructures due to repeated heating, and the bottom metal layer could be damaged.…”

Section: Resultsmentioning

confidence: 99%

Large-Area Nanogap-Controlled 3D Nanoarchitectures Fabricated via Layer-by-Layer Nanoimprint

et al. 2021

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The fabrication of large-area and flexible nanostructures currently presents various challenges related to the special requirements for 3D multilayer nanostructures, ultrasmall nanogaps, and size-controlled nanomeshes. To overcome these rigorous challenges, a simple method for fabricating wafer-scale, ultrasmall nanogaps on a flexible substrate using a temperature above the glass transition temperature (Tg) of the substrate and by layer-by-layer nanoimprinting is proposed here. The size of the nanogaps can be easily controlled by adjusting the pressure, heating time, and heating temperature. In addition, 3D multilayer nanostructures and nanocomposites with 2, 3, 5, 7, and 20 layers were fabricated using this method. The fabricated nanogaps with sizes ranging from approximately 1 to 40 nm were observed via high-resolution transmission electron microscopy (HRTEM). The multilayered nanostructures were evaluated using focused ion beam (FIB) technology. Compared with conventional methods, our method could not only easily control the size of the nanogaps on the flexible large-area substrate but could also achieve fast, simple, and cost-effective fabrication of 3D multilayer nanostructures and nanocomposites without any post-treatment. Moreover, a transparent electrode and nanoheater were fabricated and evaluated. Finally, surface-enhanced Raman scattering substrates with different nanogaps were evaluated using rhodamine 6G. In conclusion, it is believed that the proposed method can solve the problems related to the high requirements of nanofabrication and can be applied in the detection of small molecules and for manufacturing flexible electronics and soft actuators.

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Section: Resultsmentioning

confidence: 99%

Large-Area Nanogap-Controlled 3D Nanoarchitectures Fabricated via Layer-by-Layer Nanoimprint

et al. 2021

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“…In recent years, artificially fabricated nanostructures have been employed in various domains of modern technologies like nanoelectronics, optoelectronics, color filer electrodes, security hologram, high-density magnetic storage, nano-electro-mechanical systems (NEMS), energy harvesting, sensing, and diagnostic devices [1][2][3][4][5][6][7][8][9][10][11]. The rapid fabrication of nanostructures over a large area at low-cost remains one of the biggest challenges with traditional nanofabrication techniques, including electron beam lithography, focused ion beam lithography, X-ray lithography, ion projection lithography, deep-UV projection lithography, and so on [4,6,12,13].…”

Section: Introductionmentioning

confidence: 99%

Magnetic force assisted thermal nanoimprint lithography (MF-TNIL) for cost-effective fabrication of 2D nanosquare array

Moirangthem

2020

Nano Ex.

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The work presented here describes a simple, low-cost, and unconventional technique to fabricate a 2D nanosquare array using magnetic force assisted thermal nanoimprint lithography (MF-TNIL). The nanofabrication process involves two steps: (i) fabrication of a 2D nanosquare array template on a laminated plastic sheet via sequential thermal nanoimprinting of linear nanograting polydimethylsiloxane (PDMS) stamp, and (ii) reversal imprinting of template on UV curable polymer using soft UVnanoimprint lithography. Without using an expensive nanofabrication tool, our proposed technique can fabricate nanosquare array over an area of 1×1 cm 2 with individual nanosquare having a feature size of about 383 nm×354 nm×70 nm. We believe that our proposed MF-TNIL represents a promising nanofabrication technique that will allow fabricating various types of nanostructures for their applications in developing sensors, anti-reflective surfaces, self-cleaning surfaces, etc. OPEN ACCESS RECEIVED

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“…To further improve the nanocomposites, our group proposed a novel method for the fabrication of three-dimensional (3D) grid-like Ag–TiO 2 and Ag–Au nanocomposites for photocatalysis and polarization color filters using nanowelding technique. Until now, we have only studied nanoscale composites comprising low-melting temperature noble metals (Ag and Au).…”

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confidence: 99%

3D Layer-By-Layer Pd-Containing Nanocomposite Platforms for Enhancing the Performance of Hydrogen Sensors

Zhao

Ahn

et al. 2020

ACS Sens.

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Herein, a nanowelding technique is adopted to fabricate three-dimensional layer-by-layer Pd-containing nanocomposite structures with special properties. Nanowires fabricated from noble metals (Pd, Pt, Au, and Ag) were used to prepare Pd− Pd nanostructures and Pd−Au, Pd−Pt, Pd−Ag, and Pd−Pt−Au nanocomposite structures by controlling the welding temperature. The recrystallization behavior of the welded composite materials was observed and analyzed. In addition, their excellent mechanical and electrical properties were confirmed by performing 10,000 bending test cycles and measuring the resistances. Finally, flexible and wearable nanoheaters and gas sensors were fabricated using our proposed method. In comparison with conventional techniques, our proposed method can not only easily achieve sensors with a large surface area and flexibility but also improve their performance through the addition of catalyst metals. A gas sensor fabricated using the Pd−Au nanocomposites demonstrated 3.9-fold and 1.1-fold faster H 2 recovery and response, respectively, than a pure Pd−Pd gas sensor device. Moreover, the Pd−Ag nanocomposite exhibited a high sensitivity of 5.5% (better than that of other fabricated gas sensors) for 1.6% H 2 concentration. Therefore, we believe that the fabricated nanocomposites appear promising for wide applications in wearable gas sensors, flexible optical devices, and flexible catalytic devices.

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Heterogeneous Nanostructures Fabricated via Binding Energy-Controlled Nanowelding

Cited by 10 publications

References 67 publications

Large-Area Nanogap-Controlled 3D Nanoarchitectures Fabricated via Layer-by-Layer Nanoimprint

Large-Area Nanogap-Controlled 3D Nanoarchitectures Fabricated via Layer-by-Layer Nanoimprint

Magnetic force assisted thermal nanoimprint lithography (MF-TNIL) for cost-effective fabrication of 2D nanosquare array

3D Layer-By-Layer Pd-Containing Nanocomposite Platforms for Enhancing the Performance of Hydrogen Sensors

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