Photonic Crystal Chemical Sensors:  pH and Ionic Strength

Lee, Kangtaek; Asher, Sanford A.

doi:10.1021/ja002017n

Cited by 588 publications

(502 citation statements)

References 23 publications

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“…In particular, the interconnected periodic array of pores in the inverse opal structure, synthesized from a sacrificial colloidal crystal template, has made it a viable bottom-up materials candidate for applications in photonics, [1][2][3][4] tissue engineering, 5 sensing, 6,7 and catalysis. 8,9 However, in order to utilize these structures as functional materials, tuning the inverse opal composition is extremely important.…”

Section: Introductionmentioning

confidence: 99%

Three-Phase Co-assembly: In Situ Incorporation of Nanoparticles into Tunable, Highly Ordered, Porous Silica Films

et al. 2013

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We present a reproducible, one-pot colloidal co-assembly approach that results in large-scale, highly-ordered porous silica films with embedded, uniformly-distributed, accessible gold nanoparticles. The unique coloration of these inverse opal films combines iridescence with plasmonic effects. The coupled optical properties are easily tunable either by changing the concentration of added nanoparticles to the solution before assembly or by localized growth of the embedded Au nanoparticles upon exposure to tetrachloroauric acid solution, after colloidal template removal. The presence of the selectively absorbing particles furthermore enhances the hue and saturation of the inverse opals color by suppressing incoherent diffuse scattering. The composition and optical properties of these films are demonstrated to be locally tunable using selective functionalization of the doped opals.

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Section: Introductionmentioning

confidence: 99%

Three-Phase Co-assembly: In Situ Incorporation of Nanoparticles into Tunable, Highly Ordered, Porous Silica Films

et al. 2013

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“…Inverse opals can exhibit a high degree of interconnected porosity (approximately 75%) with extremely uniform size (average size normally in the range of 100-1000 nm) and periodic distributions of pores, achieved through colloidal monodispersity. Such structures have been shown to be potentially useful in a wide range of fields, including photonics (6-10), tissue engineering (11,12), sensing (13,14), and catalysis (10,15,16). However, whereas conventional self-assembly has yielded ordered inverse opal structures over modest (≤10 μm) length scales, such processes have been plagued by uncontrolled formation of defects over larger length scales (2,3), thus limiting their real-world applications.…”

mentioning

confidence: 99%

Assembly of large-area, highly ordered, crack-free inverse opal films

Hatton

Mishchenko

Davis

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

503

578

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Whereas considerable interest exists in self-assembly of well-ordered, porous “inverse opal” structures for optical, electronic, and (bio)chemical applications, uncontrolled defect formation has limited the scale-up and practicality of such approaches. Here we demonstrate a new method for assembling highly ordered, crack-free inverse opal films over a centimeter scale. Multilayered composite colloidal crystal films have been generated via evaporative deposition of polymeric colloidal spheres suspended within a hydrolyzed silicate sol-gel precursor solution. The coassembly of a sacrificial colloidal template with a matrix material avoids the need for liquid infiltration into the preassembled colloidal crystal and minimizes the associated cracking and inhomogeneities of the resulting inverse opal films. We discuss the underlying mechanisms that may account for the formation of large-area defect-free films, their unique preferential growth along the 〈110〉 direction and unusual fracture behavior. We demonstrate that this coassembly approach allows the fabrication of hierarchical structures not achievable by conventional methods, such as multilayered films and deposition onto patterned or curved surfaces. These robust SiO 2 inverse opals can be transformed into various materials that retain the morphology and order of the original films, as exemplified by the reactive conversion into Si or TiO 2 replicas. We show that colloidal coassembly is available for a range of organometallic sol-gel and polymer matrix precursors, and represents a simple, low-cost, scalable method for generating high-quality, chemically tailorable inverse opal films for a variety of applications.

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“…A polymerised crystalline colloidal array consisting of a poly(acrylamide) hydrogel with embedded polystyrene colloids and a colour shift of 300 nm has been reported. 76 The investigation of a similar system from which the colloidal particles had been removed resulted in an inverseopal structure. This led to pH-sensitive materials in which the sensitivity depends on the amount of acrylic acid incorporated.…”

Section: Ph-responsive Photonic Polymersmentioning

confidence: 99%

Stimuli-responsive photonic polymer coatings

2014

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This feature article focuses on the highlights in the development of photonic polymer coatings that can change their volume or surface topology in a reversible, dynamic fashion when exposed to an external stimulus. Topographic response is established using hydrogels or liquid crystal polymer networks. By changing the surface corrugation in response to light various functional coating properties can be modulated, for instance wettability and/or mechanical friction. The same volume changes in photonic coatings caused by different stimuli lead to changes in light reflection.

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Photonic Crystal Chemical Sensors: pH and Ionic Strength

Cited by 588 publications

References 23 publications

Three-Phase Co-assembly: In Situ Incorporation of Nanoparticles into Tunable, Highly Ordered, Porous Silica Films

Three-Phase Co-assembly: In Situ Incorporation of Nanoparticles into Tunable, Highly Ordered, Porous Silica Films

Assembly of large-area, highly ordered, crack-free inverse opal films

Stimuli-responsive photonic polymer coatings

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