Transfer printing of colloidal crystals based on UV mediated degradation of a polymer thin film

Banik, Meneka; Bhandaru, Nandini; Mukherjee, Rabibrata

doi:10.1039/c8cc01572d

Cited by 17 publications

(21 citation statements)

References 32 publications

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“…The Janus particles were created by well known toposelcetive deposition of Gold on a pre-existing array of polystyrene (PS) particles (dia 300 nm and 600 nm) obtained by spin coating on a poly(methyl methacrylate) (PMMA) coated substrate 37 , 38 . The particle array was first exposed to oxygen plasma in an Inductively Coupled Plasma Reactive Ion Etching (ICP-RIE) chamber for 6 s for slight reduction in size (the diameter of the colloids reduced to 285 nm and 583 nm respectively) so that the neighboring particles do not remain in contact during the subsequent metal deposition step.…”

Section: Methodsmentioning

confidence: 99%

Substrate wettability guided oriented self assembly of Janus particles

Banik

Sett

Bakli

et al. 2021

Sci Rep

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Self-assembly of Janus particles with spatial inhomogeneous properties is of fundamental importance in diverse areas of sciences and has been extensively observed as a favorably functionalized fluidic interface or in a dilute solution. Interestingly, the unique and non-trivial role of surface wettability on oriented self-assembly of Janus particles has remained largely unexplored. Here, the exclusive role of substrate wettability in directing the orientation of amphiphilic metal-polymer Bifacial spherical Janus particles, obtained by topo-selective metal deposition on colloidal Polymestyere (PS) particles, is explored by drop casting a dilute dispersion of the Janus colloids. While all particles orient with their polymeric (hydrophobic) and metallic (hydrophilic) sides facing upwards on hydrophilic and hydrophobic substrates respectively, they exhibit random orientation on a neutral substrate. The substrate wettability guided orientation of the Janus particles is captured using molecular dynamic simulation, which highlights that the arrangement of water molecules and their local densities near the substrate guide the specific orientation. Finally, it is shown that by spin coating it becomes possible to create a hexagonal close-packed array of the Janus colloids with specific orientation on differential wettability substrates. The results reported here open up new possibilities of substrate-wettability driven functional coatings of Janus particles, which has hitherto remained unexplored.

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Section: Methodsmentioning

confidence: 99%

Substrate wettability guided oriented self assembly of Janus particles

Banik

Sett

Bakli

et al. 2021

Sci Rep

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“…The working pressure was maintained at 0.02 mbar, and the deposition was carried out at an RF power of 25 W for 30 min. Subsequently, HCP array of monolayer PS colloids was transferred onto the ZnO seed layer following UVO‐mediated colloidal transfer printing . Monodisperse PS colloids of diameters d D = 300, 450, 600, and 800 nm (obtained from Sigma, UK) were used in these experiments.…”

Section: Methodsmentioning

confidence: 99%

“…The time‐consuming parameter optimization step for perfect ordering of colloids on any surface can be circumvented by adopting colloidal transfer printing instead of direct spin coating. In this approach, the array is first created on a “known” surface on which the parameters are well optimized and subsequently transferred to the target substrate . However, this approach could not be adopted for the growth of ZnO NRs, till, recently, all existing colloidal transfer printing techniques required modification of the target substrate with an adhesion promoting layer, which, in turn, hindered the ZnO NR growth on the seed layer.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Transfer Printing–Mediated Fabrication of Zinc Oxide Nanorods for Self‐Cleaning Applications

Banik

Chakrabarty

Das

et al. 2019

Adv Materials Inter

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Fabrication of superhydrophobic surfaces with extremely low contact angle hysteresis (θCAH < 4°), which exhibits excellent self‐cleaning behavior by colloidal template–guided hydrothermal growth of zinc oxide nanorods (ZnO NRs), is reported. A hexagonal close packed monolayer of polystyrene (PS) colloids is first deposited by spin coating on a thin poly(methyl methacrylate) (PMMA) film. Subsequently, the colloidal array is transferred to a substrate precoated with sputtered zinc oxide seed layer by UV‐Ozone (UVO) mediated colloidal transfer printing. ZnO NRs are grown with colloids of different diameter (dD) varying between 300 and 800 nm, and for each dD the growth time (tG) is optimized to obtain maximum level of hydrophobicity. These experiments show that best self‐cleaning property is achieved with colloids having dD = 600 nm and tG = 4 h, which do not require any subsequent low surface energy coating. Using transfer printing allows uniform coverage of the monolayer colloidal array over the sputtered seed layer spanning over large areas, irrespective of the roughness or curvature of the target substrate.

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“…The array was placed on the ZnO seed layer-coated ITO glass by UVO—mediated colloidal transfer printing, reported elsewhere. 40−42…”

Section: Methodsmentioning

confidence: 99%

Light Trapping-Mediated Room-Temperature Gas Sensing by Ordered ZnO Nano Structures Decorated with Plasmonic Au Nanoparticles

Chakrabarty¹,

Banik²,

Gogurla³

et al. 2019

ACS Omega

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An ordered array of 1D ZnO nanorods obtained by colloidal templating is shown to dramatically enhance the sensing response of NO x at room temperature by confining light and creating periodic structures. The sensitivity is measured for a concentration varying from 2 to 10 ppm (response 53% at 10 ppm) at room temperature under white light illumination with ≈225 nm hole diameter. In contrast, structures with ≈450 nm hole size show better sensing under (response 98% at 10 ppm) elevated temperatures in dark conditions, which is attributed to the increased surface chemical interactions with NO x molecules due to the porous nature and enhanced accessible surface area of ZnO nanorods. Further, the decoration of ZnO Nanorods with gold nanoparticles shows enhanced sensor performance (response 130% at 10 ppm) due to localized surface plasmon resonance under white light illumination. The findings may lead to new opportunities in the visible light-activated room-temperature NO x sensors for healthcare applications.

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Transfer printing of colloidal crystals based on UV mediated degradation of a polymer thin film

Cited by 17 publications

References 32 publications

Substrate wettability guided oriented self assembly of Janus particles

Substrate wettability guided oriented self assembly of Janus particles

Colloidal Transfer Printing–Mediated Fabrication of Zinc Oxide Nanorods for Self‐Cleaning Applications

Light Trapping-Mediated Room-Temperature Gas Sensing by Ordered ZnO Nano Structures Decorated with Plasmonic Au Nanoparticles

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