Free-standing Au inverse opals for enhanced glucose sensing

Liao, Chen; Hsieh, Yu Chi; Huang, Bo; Pai, Chia Hao; Wu, Pu‐Wei

doi:10.1016/j.jallcom.2016.05.104

Cited by 17 publications

(10 citation statements)

References 32 publications

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“…It is noted that the magnitude of voltage recorded represented the electric resistance incurred during the electroplating process. As shown, among these three samples, their voltage profiles were rather similar; at the initial stage, the voltage started below −1.4 V and was reduced quickly to −1.27 V within the first 500 s, followed by a slow descent to −1.2 V at 6000 s. This behavior was consistent with what were reported earlier in similar experiments [ 35 , 38 ]. Since the Ni electrodeposition was conducted at a fixed current, the absolute value of the recorded voltage was proportional to the sum of electrolyte iR loss and charge transfer resistance of Ni 2+ /Ni.…”

Section: Resultssupporting

confidence: 90%

“…This allowed us to fabricate single-layer inverse opals with ideal hexagonal honeycombs and controlled thickness [ 31 , 32 ]. In addition, we have explored their possible applications in both gas sensing and electrochemical sensing [ 33 , 34 , 35 ]. Due to their improved crystallinity, the inverse opals were able to be detached from the substrate, becoming essentially a 3D ordered macroporous membrane [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, we have explored their possible applications in both gas sensing and electrochemical sensing [ 33 , 34 , 35 ]. Due to their improved crystallinity, the inverse opals were able to be detached from the substrate, becoming essentially a 3D ordered macroporous membrane [ 35 , 36 ]. We recognized that this free-standing inverse opaline film provides new opportunities for applications in filtering and selective adsorption.…”

Section: Introductionmentioning

confidence: 99%

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Formation of Free-Standing Inverse Opals with Gradient Pores

et al. 2020

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We demonstrate the fabrication of free-standing inverse opals with gradient pores via a combination of electrophoresis and electroplating techniques. Our processing scheme starts with the preparation of multilayer colloidal crystals by conducting sequential electrophoresis with polystyrene (PS) microspheres in different sizes (300, 600, and 1000 nm). The critical factors affecting the stacking of individual colloidal crystals are discussed and relevant electrophoresis parameters are identified so the larger PS microspheres are assembled successively atop of smaller ones in an orderly manner. In total, we construct multilayer colloidal crystals with vertical stacking of microspheres in 300/600, 300/1000, and 300/600/1000 nm sequences. The inverse opals with gradient pores are produced by galvanostatic plating of Ni, followed by the selective removal of colloidal template. Images from scanning electron microscopy exhibit ideal multilayer close-packed structures with well-defined boundaries among different layers. Results from porometer analysis reveal the size of bottlenecks consistent with those of interconnected pore channels from inverse opals of smallest PS microspheres. Mechanical properties determined by nanoindentation tests indicate significant improvements for multilayer inverse opals as compared to those of conventional single-layer inverse opals.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation of Free-Standing Inverse Opals with Gradient Pores

et al. 2020

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“…In our laboratory, we have adopted the electrophoresis to construct colloidal crystals in both planar and cylindrical forms, and relevant electrophoresis parameters have been fully optimized [36][37][38][39]. Moreover, we have fabricated inverse opals in Ni, Au, ZnO, and SiO 2 , and explored their potential applications in chemical sensing and photonic devices [29,[40][41][42]. Figure 1 displays the SEM images of PS colloidal crystals in both cross-sectional and top views.…”

Section: Fabrication Of Colloidal Crystals and Their Inverse Opalsmentioning

confidence: 99%

“…We recognize that a three-dimensional macroporous structure is able to provide higher sensitivity and lower detection limit due to its excessive surface area and open porous nature. Among many possible three-dimensional structures, the inverse opals reveal a large surface-to-volume ratio, uniform pores with interconnected channels, and robust mechanical property, attributes that are desirable for electrochemical sensing [28,29]. Therefore, we envision that the fabrication of core@shell inverse opals might be a feasible way to improve sensing performances as earlier examples of core@shell nanostructures have reported impressive results in catalysis, sensing, and electrocatalysis [30,31].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Ni@PEDOT and Ni@PEDOT/Au (Core@Shell) Inverse Opals for Simultaneous Detection of Ascorbic Acid, Dopamine, and Uric Acid

et al. 2020

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We demonstrate a water-based synthetic route to fabricate composite inverse opals for simultaneous detection of ascorbic acid (AA), dopamine (DA), and uric acid (UA). Our process involves the conformal deposition of poly(3,4-ethylenedioxythiophene) (PEDOT) and PEDOT/Au on the skeletons of Ni inverse opals via cyclic voltammetric scans (CV) to initiate the electropolymerization of 3,4-ethylenedioxythiophene (EDOT) monomers. The resulting samples, Ni@PEDOT, and Ni@PEDOT/Au inverse opals, exhibit a three-dimensional ordered macroporous platform with a large surface area and interconnected pore channels, desirable attributes for facile mass transfer and strong reaction for analytes. Structural characterization and material/chemical analysis including scanning electron microscope, X-ray photoelectron spectroscopy, and Raman spectroscopy are carried out. The sensing performances of Ni@PEDOT and Ni@PEDOT/Au inverse opals are explored by conducting CV scans with various concentrations of AA, DA, and UA. By leveraging the structural advantages of inverse opals and the selection of PEDOT/Au composite, the Ni@PEDOT/Au inverse opals reveal improved sensing performances over those of conventional PEDOT-based nanostructured sensors.

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Flexible Optogenetic Transducer Device for Remote Neuron Modulation Using Highly Upconversion‐Efficient Dendrite‐Like Gold Inverse Opaline Structure

Chu

Chen

et al. 2022

Adv Healthcare Materials

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A remote optogenetic device for analyzing freely moving animals has attracted extensive attention in optogenetic engineering. In particular, for peripheral nerve regions, a flexible device is needed to endure the continuous bending movements of these areas. Here, a remote optogenetic optical transducer device made from a gold inverse opaline skeleton grown with a dendrite-like gold nanostructure (D-GIOF) and chemically grafted with upconversion nanoparticles (UCNPs) is developed. This implantable D-GIOF-based transducer device can achieve synergistic interaction of the photonic crystal effect and localized surface plasmon resonance, resulting in considerable UCNP conversion efficiency with a negligible thermal effect under low-intensity 980 nm near-infrared (NIR) light excitation. Furthermore, the D-GIOF-based transducer device exhibits remarkable emission power retention (≈100%) under different bending states, indicating its potential for realizing peripheral nerve stimulation. Finally, the D-GIOF-based transducer device successfully stimulates neuronal activities of the sciatic nerve in mice. This study demonstrates the potential of the implantable device to promote remote NIR stimulation for modulation of neural activity in peripheral nerve regions and provides proof of concept for its in vivo application in optogenetic engineering.

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Free-standing Au inverse opals for enhanced glucose sensing

Cited by 17 publications

References 32 publications

Formation of Free-Standing Inverse Opals with Gradient Pores

Formation of Free-Standing Inverse Opals with Gradient Pores

Green Synthesis of Ni@PEDOT and Ni@PEDOT/Au (Core@Shell) Inverse Opals for Simultaneous Detection of Ascorbic Acid, Dopamine, and Uric Acid

Flexible Optogenetic Transducer Device for Remote Neuron Modulation Using Highly Upconversion‐Efficient Dendrite‐Like Gold Inverse Opaline Structure

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