Colorimetric Ethanol Indicator Based on Instantaneous, Localized Wetting of a Photonic Crystal

Yu, Yanhao; Brandt, S.; Nicolas, N.; Aizenberg, Joanna

doi:10.1021/acsami.9b19836

Cited by 32 publications

(26 citation statements)

References 43 publications

(82 reference statements)

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“…Furthermore, the responsiveness of the inverse opals will depend on the wettability of their constituent materials for the adsorbing oils with a good wettability facilitating the response by their structural color change. PhC structures have also been investigated for differentiation of water/ethanol mixtures , based on the difference in their wettability. The wettability of PhC structures can be well tuned by the number of layers of the periodic lattice, chemical surface coating, and neck angles (defined by the size of the pore diameter and the size of opening of the interconnected pores, as indicated in Figure b) .…”

Section: Refractive Index Variation-induced Sensingmentioning

confidence: 99%

Bottom-Up Assembled Photonic Crystals for Structure-Enabled Label-Free Sensing

et al. 2021

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Photonic crystals (PhCs) display photonic stop bands (PSBs) and at the edges of these PSBs transport light with reduced velocity, enabling the PhCs to confine and manipulate incident light with enhanced light–matter interaction. Intense research has been devoted to leveraging the optical properties of PhCs for the development of optical sensors for bioassays, diagnosis, and environmental monitoring. These applications have furthermore benefited from the inherently large surface area of PhCs, giving rise to high analyte adsorption and the wide range of options for structural variations of the PhCs leading to enhanced light–matter interaction. Here, we focus on bottom-up assembled PhCs and review the significant advances that have been made in their use as label-free sensors. We describe their potential for point-of-care devices and in the review include their structural design, constituent materials, fabrication strategy, and sensing working principles. We thereby classify them according to five sensing principles: sensing of refractive index variations, sensing by lattice spacing variations, enhanced fluorescence spectroscopy, surface-enhanced Raman spectroscopy, and configuration transitions.

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Section: Refractive Index Variation-induced Sensingmentioning

confidence: 99%

Bottom-Up Assembled Photonic Crystals for Structure-Enabled Label-Free Sensing

et al. 2021

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“…A surface chemical gradient across an IO can also be accomplished by codepositing two silanes at differing concentrations. 32 …”

Section: Synthesismentioning

confidence: 99%

Evaporation-Induced Self-Assembly of Metal Oxide Inverse Opals: From Synthesis to Applications

et al. 2022

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Conspectus Inverse opals (IOs) are highly interconnected three-dimensional macroporous structures with applications in a variety of disciplines from optics to catalysis. For instance, when the pore size is on the scale of the wavelength of visible light, IOs exhibit structural color due to diffraction and interference of light rather than due to absorption by pigments, making these structures valuable as nonfading paints and colorants. When IO pores are in an ordered arrangement, the IO is a 3D photonic crystal, a structure with a plethora of interesting optical properties that can be used in a multitude of applications, from sensors to lasers. IOs also have interesting fluidic properties that arise from the re-entrant geometry of the pores, making them excellent candidates for colorimetric sensors based on fluid surface tension. Metal oxide IOs, in particular, can also be photo- and thermally catalytically active due to the catalytic activity of the background matrix material or of functional nanoparticles embedded within the structure. Evaporation-induced self-assembly of sacrificial particles has been developed as a scalable method for forming IOs. The pore size and shape, surface chemistry, matrix material, and the macroscopic shape of the IO, as well as the inclusion of functional components, can be designed through the choice of deposition conditions such as temperature and humidity, types and concentrations of components in the self-assembly mixture, and the postassembly processing. These parameters allow researchers to tune the optical, mechanical, and thermal transport properties of IOs for optimum functionality. In this Account , we focus on experimental and theoretical studies to understand the self-assembly process and properties of metal oxide IOs without (bare) and with (hybrid) plasmonic or catalytic metal nanoparticles incorporated. Several synthetic approaches are first presented, together with a discussion of the various forces involved in the assembly process. The visualization of the deposition front with time-lapse microscopy is then discussed together with analytical theory and numerical simulations to determine the conditions needed for the deposition of a continuous IO film. Subsequently, we present high-resolution scanning electron microscopy (SEM) of assembled colloids over large areas, which provides a detailed view of the evolution of the assembly process, showing that the organization of the colloids is initially dictated by the meniscus of the evaporating suspension on the substrate, but that gradually all grains rotate to occupy the thermodynamically most favorable orientation. High-resolution 3D transmission electron microscopy (TEM) is then presented together with analysis of the wetting of the templating colloids by the matrix precursor to provide a detailed picture of the embedding of metallic nanoparticles at the pore–matrix interface. Finally, the resulting properties and applications in optics, wetting, and cata...

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“…We also investigated the ability to print gradients, which has applications such as functionality gradient for sensing 65 or liquid guiding. 66 Another impactful use of printed gradients lies within the interaction between bacteria and antibiotics.…”

Section: ■ Discussionmentioning

confidence: 99%

Consumer-Grade Inkjet Printer for Versatile and Precise Chemical Deposition

et al. 2021

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Two simple, mechanical modifications are introduced to a consumer-grade inkjet printer to greatly increase its applicability. First, roller isolation bars are added to unlock multiple prints on the same substrate without smearing. This enables printing on a diverse set of substrates (rigid, elastic, liquid, granular, and sticky). Second, spring loadings are added to increase the print precision up to 50-fold, which facilitates alignment to a pre-patterned substrate or between successive prints. Utilizing the expanded substrate compatibility and the increased print precision, we explore tunable loading of drug combinations into microdevices. This loading method has promising applications within point-of-care personalized medication. Furthermore, we show how inkjet printers with array-type printheads (in our case, 6 x 90 nozzles) allow for quasi-simultaneous loading of reactants into microfluidic systems. The ability to do a quasi-simultaneous introduction of chemicals may be particularly useful for studies of rapidly reacting systems of three or more reactants, where premature introduction can shift the initial conditions from the intended. We believe that our modifications to an affordable system will inspire researchers to explore the possibilities of inkjet printing even further.

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Colorimetric Ethanol Indicator Based on Instantaneous, Localized Wetting of a Photonic Crystal

Cited by 32 publications

References 43 publications

Bottom-Up Assembled Photonic Crystals for Structure-Enabled Label-Free Sensing

Bottom-Up Assembled Photonic Crystals for Structure-Enabled Label-Free Sensing

Evaporation-Induced Self-Assembly of Metal Oxide Inverse Opals: From Synthesis to Applications

Consumer-Grade Inkjet Printer for Versatile and Precise Chemical Deposition

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