Microfluidic spatial growth of vertically aligned ZnO nanostructures by soft lithography for antireflective patterning

Mehare, Rupali S.; Devarapalli, Rami Reddy; Yenchalwar, Sandeep G.; Shelke, Manjusha V.

doi:10.1007/s10404-012-1119-z

Cited by 7 publications

(5 citation statements)

References 41 publications

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“…As already mentioned, there are several fabrication methods available in literature but desired growth of nano-microstructures directly in micro-channels is still an open issue. There exist only a few reports that have described direct growth of Q1D ZnO nanostructures on chips using different methods but most of them involve multiple fabrication steps. − The potential of the newly introduced flame transport synthesis (FTS) technique, which is a very simple fabrication approach for hexagonal ZnO nano- and microstructures, is great for micro-trenched Si wafers due to a cost effective and single-step process. ,, …”

Section: Introductionmentioning

confidence: 99%

Single Step Integration of ZnO Nano- and Microneedles in Si Trenches by Novel Flame Transport Approach: Whispering Gallery Modes and Photocatalytic Properties

Reimer

Paulowicz²,

Röder

et al. 2014

ACS Appl. Mater. Interfaces

161

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Direct growth of quasi-one-dimensional nano- and microstructures in desired places of complex shaped substrates using simple growth methods is highly demanded aspect for various applications. In this work, we have demonstrated direct integration of ZnO nano- and microneedles into Si trenches by a novel flame transport synthesis approach in a single fabrication step. Growth of partially and fully covered or filled trenches in Si substrate with ZnO nano- and microneedles has been investigated and is discussed here. Detailed microstructural studies revealed the evolution of the ZnO nano- and microneedles as well as their firm adhesion to the wall in the Si trenches. Micro-photoluminescence measurements at different locations along the length of needles confirmed the good crystalline quality and also the presence of whispering gallery mode resonances on the top of needles due to their hexagonal shape. Faceted ZnO nano- and microstructures are also very important candidates with regard to photocatalytic activity. First, photocatalytic measurements from the grown ZnO nano- and microneedles have shown strong degradation of methylene blue, which demonstrate that these structures can be of significant interest for photocatalysis and self-cleaning chromatography columns.

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Section: Introductionmentioning

confidence: 99%

Single Step Integration of ZnO Nano- and Microneedles in Si Trenches by Novel Flame Transport Approach: Whispering Gallery Modes and Photocatalytic Properties

Reimer

Paulowicz²,

Röder

et al. 2014

ACS Appl. Mater. Interfaces

161

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“…48,76 Specifically, along the flow direction, the length of nanowires decreased and the morphology changed from pyramidal tops to flat tops. 48,49 By modulating the synthesis parameters such as the seed preparation, residence time, and heating locations, ZnO nanowire arrays could be synthesized either on the entire substrate/patterned area, 53,57,78 or along the microheaters inside the microchannel (Fig. 2B).…”

Section: Continuous Laminar Flow Synthesismentioning

confidence: 99%

“…54 Furthermore, due to their superior features such as ease of synthesis, low cost, wide bandgaps, high bulk electron mobility, appropriate refractive index, and flexible morphology control, ZnO nanostructures have already demonstrated their great potential in energy-harvesting devices. 57,66…”

Section: Biomaterials Science Reviewmentioning

confidence: 99%

Microfluidics for ZnO micro-/nanomaterials development: rational design, controllable synthesis, and on-chip bioapplications

Hao

Zhang

2020

Biomater. Sci.

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“…In addition, various studies have been devoted to using the microfluidic environment to grow ZnO-NWs in situ within microchannels whose width does not exceed 500 µm 38 – 40 . A combination of in situ and conventional hydrothermal growth was proposed by Kim et al 41 and Mehare et al 42 Furthermore, Luo et al 43 succeeded in obtaining ZnO nanostructures, not NWs, locally within capillary tubes. A recent review by Hao et al 44 summarizes the different microfluidic approaches for the synthesis of various ZnO micro/nanostructures and highlights their potential application in biosensing, biological separation, and molecular catalysis applications through microfluidic chips.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal dynamics of nanowire growth in a microfluidic reactor

et al. 2021

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Co-integration of nanomaterials into microdevices poses several technological challenges and presents numerous scientific opportunities that have been addressed in this paper by integrating zinc oxide nanowires (ZnO-NWs) into a microfluidic chamber. In addition to the applications of these combined materials, this work focuses on the study of the growth dynamics and uniformity of nanomaterials in a tiny microfluidic reactor environment. A unique experimental platform was built through the integration of a noninvasive optical characterization technique with the microfluidic reactor. This platform allowed the unprecedented demonstration of time-resolved and spatially resolved monitoring of the in situ growth of NWs, in which the chemicals were continuously fed into the microfluidic reactor. The platform was also used to assess the uniformity of NWs grown quickly in a 10-mm-wide microchamber, which was intentionally chosen to be 20 times wider than those used in previous attempts because it can accommodate applications requiring a large surface of interaction while still taking advantage of submillimeter height. Further observations included the effects of varying the flow rate on the NW diameter and length in addition to a synergetic effect of continuous renewal of the growth solution and the confined environment of the chemical reaction.

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Microfluidic spatial growth of vertically aligned ZnO nanostructures by soft lithography for antireflective patterning

Cited by 7 publications

References 41 publications

Single Step Integration of ZnO Nano- and Microneedles in Si Trenches by Novel Flame Transport Approach: Whispering Gallery Modes and Photocatalytic Properties

Single Step Integration of ZnO Nano- and Microneedles in Si Trenches by Novel Flame Transport Approach: Whispering Gallery Modes and Photocatalytic Properties

Microfluidics for ZnO micro-/nanomaterials development: rational design, controllable synthesis, and on-chip bioapplications

Spatiotemporal dynamics of nanowire growth in a microfluidic reactor

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