Enhanced Self-Organized Dewetting of Ultrathin Polymer Blend Film for Large-Area Fabrication of SERS Substrate

Zhang, Huanhuan; Xu, Lin; Xu, Yanqiao; Huang, Gang; Zhao, Xiujian; Lai, Yuqing; Shi, Tongfei

doi:10.1038/srep38337

Cited by 17 publications

(10 citation statements)

References 61 publications

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“…Nanostructured photonic devices have been developed for and utilized in various applications, including displays [ 18 ], lighting [ 19 , 20 ], solar cells [ 21 , 22 ], mechanical sensors [ 23 , 24 ], and biosensors [ 25 ]. The optical properties of photonic nanostructures depend heavily on their geometric parameters; consequently, they can be manipulated by changing the nanostructures’ designs [ 26 , 27 , 28 ]. Although photonic nanostructures can be optimized for and utilized in specific applications, on the downside, the predefined physical structures have a limited tuning capability and working bandwidth that could restrict potential applications [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Micro-Actuated Tunable Hierarchical Silver Nanostructures to Measure Tensile Force for Biomedical Wearable Sensing Applications

et al. 2021

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Commercially available biomedical wearable sensors to measure tensile force/strain still struggle with miniaturization in terms of weight, size, and conformability. Flexible and epidermal electronic devices have been utilized in these applications to overcome these issues. However, current sensors still require a power supply and some form of powered data transfer, which present challenges to miniaturization and to applications. Here, we report on the development of flexible, passive (thus zero power consumption), and biocompatible nanostructured photonic devices that can measure tensile strain in real time by providing an optical readout instead of an electronic readout. Hierarchical silver (Ag) nanostructures in various thicknesses of 20–60 nm were fabricated and embedded on a stretchable substrate using e-beam lithography and a low-temperature dewetting process. The hierarchical Ag nanostructures offer more design flexibility through a two-level design approach. A tensional force applied in one lateral (x- or y-) direction of the stretchable substrate causes a Poisson contraction in the other, and as a result, a shift in the reflected light of the nanostructures. A clear blue shift of more than 100 nm in peak reflectance in the visible spectrum was observed in the reflected color, making the devices applicable in a variety of biomedical photonic sensing applications.

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Section: Introductionmentioning

confidence: 99%

Micro-Actuated Tunable Hierarchical Silver Nanostructures to Measure Tensile Force for Biomedical Wearable Sensing Applications

et al. 2021

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“…26 Zhang et al and Bhandaru et al could utilize the dewetting of a polymer blend thin film for fabricating SERS substrates and antireflection coatings, respectively. 27,28 In this paper, we show yet another novel application of thin polystyrene (PS) film dewetting by using it as a sacrificial mask layer during the well-known hydrothermal growth of titania nanorods, which have been widely utilized in photocatalysis, 29 photoelectrochemical devices, 30 antireflective (AR) coatings, 31 self-cleaning, 32 microfluidic devices, 33 sensors, 34 and solid-state optoelectronic devices, 35 due to the oxidation efficiency, 36 biocompatibility, 37 and resistance to photocorrosion. 38 Interestingly, though hydrothermal growth of TiO 2 nanorod (NR) on a seeded FTO substrate is widely reported, barring very few papers, 39−42 almost every paper on the topic reports that the TiO 2 NR array is hydrophilic.…”

Section: ■ Introductionmentioning

confidence: 99%

Polymer Thin-Film Dewetting-Mediated Growth of Wettability-Controlled Titania Nanorod Arrays for Highly Responsive, Water-Stable Self-powered UV Photodetectors

Chakrabarty

Ghorai

Ray

et al. 2020

ACS Appl. Electron. Mater.

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Holey layer of the TiO2 nanorod-covered surface obtained by the self-organization of polysterene (PS) templates is shown to achieve programmable wettability by creating nano- to micrometer-scale porosity, which is useful to demonstrate stable and self-powered Schottky junction-based UV photodetectors. The wettability characterized by static water contact angle (WCA) is found to be ∼40° (weak hydrophilic) with the nanorod film of micrometer-scale pores with a diameter of 9.91 μm and periodicity of 2.8 μm. In contrast, the holey layer of the TiO2 nanorod-covered surface with pores with a diameter of 90 nm and periodicity of pores of 1.4 μm shows a WCA ≈ 166°, which do not require any low surface energy coating and physical deposition techniques. A pure phase solution-processed superhydrophobic holey 1D TiO2 nanorod film in sandwiched configuration with platinized fluorine-doped tin oxide (FTO) electrodes shows self-powered and fast UV detection (rise time, ∼44 ms; decay time, ∼25 ms) with very high responsivity (25 A/W). The superhydrophobic sample hinders the water molecules from infiltrating into the sandwich junction, making the device performance extremely stable even in humid conditions.

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“…Lens-shaped microstructures on solid surfaces have numerous applications, such as surface antireflective coatings, bioimaging, data storage, optical lithography, ultraprecision positioning, , optothermal conversion, − and surface-enhanced Raman scattering . Remarkably, recently it has been demonstrated that microlenses are able to overcome the diffraction limit and hence improve the resolution of optical imaging systems. − Microlenses can be fabricated either individually or in batches.…”

Section: Introductionmentioning

confidence: 99%

Formation of Polystyrene Microlenses via Transient Droplets from the Ouzo Effect for Enhanced Optical Imaging

Wang¹,

Zeng²,

Zhao³

et al. 2019

J. Phys. Chem. C

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Lens-shaped microstructures on solid surfaces are important for a variety of applications, such as enhanced water harvesting, super-resolution imaging, and antireflection. Here the formation of polymeric microlenses with tunable contact angles based on an Ouzo effect is reported. In this process, water is added into a binary toluene/ethanol solution in contact with a polystyrene (PS) thin film. The dilution by water leads to spontaneous formation of toluene microdroplets due to the reduced solubility of toluene in the ternary liquid mixture (i.e., the Ouzo effect). PS in the thin film is dissolved into the toluene droplets. However, the droplets containing PS and toluene are not stable against dissolution, and eventually toluene dissolved into the surrounding ternary mixture. PS in the droplets is left on the substrate, forming microlenses on the supporting glass substrate. The size and density of PS lenses are influenced by PS film thickness and toluene concentration in the surrounding liquid. The contact angle of PS microlens could be varied through a thermal reshaping method. As demonstration for potential applications, the results show that the as-prepared microlenses can improve the spatial resolution of a standard upright optical microscope.

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Enhanced Self-Organized Dewetting of Ultrathin Polymer Blend Film for Large-Area Fabrication of SERS Substrate

Cited by 17 publications

References 61 publications

Micro-Actuated Tunable Hierarchical Silver Nanostructures to Measure Tensile Force for Biomedical Wearable Sensing Applications

Micro-Actuated Tunable Hierarchical Silver Nanostructures to Measure Tensile Force for Biomedical Wearable Sensing Applications

Polymer Thin-Film Dewetting-Mediated Growth of Wettability-Controlled Titania Nanorod Arrays for Highly Responsive, Water-Stable Self-powered UV Photodetectors

Formation of Polystyrene Microlenses via Transient Droplets from the Ouzo Effect for Enhanced Optical Imaging

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