Visually readable and highly stable self-display photonic humidity sensor

Hu, Haibo; Chen, Qianwang; Cheng, Kai; Tang, Jian

doi:10.1039/c1jm14463d

Cited by 68 publications

(47 citation statements)

References 44 publications

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“…Gas‐responsive systems that are sensitive to small concentrations of certain gas molecules (H 2 O, NH 3 , NO 2 , CO 2 , etc. ), as well as liquid‐responsive systems to detect the amount of a liquid (water or organic dispersants), are common colorimetric sensors used in safety applications, high‐tech and quality control of water/air . Increased colorimetric sensitivity can be achieved with an optimal fabrication process, e.g., with 1D, 2D, or 3D photonic crystals and functionalized materials.…”

Section: Artificial Materialsmentioning

confidence: 99%

“…This means that they develop an internal magnetization rapidly only in the presence of an external magnetic field, and once the magnetic field is removed, they lose their net magnetization completely. Due to their rapid response to a magnetic field and the ability to form photonic crystal arrays precisely and conveniently with tunable optical properties in a liquid medium (aqueous or nonaqueous), they have been studied for their potential use as colorimetric sensors, invisible photonic printing, flexible color display, security materials and structurally colored fibers . When Fe 3 O 4 nanoparticles have sufficient surface charge, they maintain colloidal stability due to electrostatic interactions.…”

Section: Artificial Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Bioinspired Stimuli‐Responsive Color‐Changing Systems

2018

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Stimuli-responsive colors are a unique characteristic of certain animals, evolved as either a method to hide from enemies and prey or to communicate their presence to rivals or mates. From a material science perspective, the solutions developed by Mother Nature to achieve these effects are a source of inspiration to scientists for decades. Here, an updated overview of the literature on bioinspired stimuli-responsive color-changing systems is provided. Starting from natural systems, which are the source of inspiration, a classification of the different solutions proposed is given, based on the stimuli used to trigger the color-changing effect.

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Section: Artificial Materialsmentioning

confidence: 99%

Section: Artificial Materialsmentioning

confidence: 99%

Bioinspired Stimuli‐Responsive Color‐Changing Systems

2018

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“…Consequently, considerable effort has been devoted to realizing color displays of polymers or hydrogels based on magnetic photonic chains exposed to various external stimuli. Many researchers have experimented with the manipulation of humidity with a saturated salt solution to drive color changes in magnetic polymers . Other researchers have investigated the thermochromic display of magnetic hydrogels by changing their temperature with a water‐bath control system .…”

Section: Introductionmentioning

confidence: 99%

Magnetochromic Photonic Hydrogel for an Alternating Magnetic Field‐Responsive Color Display

Wang

Fan

et al. 2017

Advanced Optical Materials

102

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or dynamic reflection spectral measurements. [18,19] The colors of the PhCs are related to a wide range of changes in the physical properties of the materials forming the photonic structures rather than specific chemical states responsible for absorption in a characteristic wavelength region. [20] Hence, the materials for fabricating PhCs have no specific chemical requirements. Regardless of its chemical properties, any material with a photonic structure can display iridescence as long as the PBG is located in the region of visible light wavelengths, which leads to the potential for broad applicability in colorimetric response.As an important technical extension of responsive PhCs, magnetically tunable photonic systems have been developed through the self-assembly of uniform superparamagnetic colloidal particles in liquid media, [21][22][23][24] which provide a new platform for chromatic applications. The magnetic fields in these systems play a vital role in color modulation, with the benefits of contactless control, instant action and ease of integration into electronic devices. However, the colloidal stability of such systems is poor due to the chain aggregations of dynamically ordered assemblies induced by the magnetic packing force. [25][26][27] Using a polymer matrix to stabilize the photonic structures is an ideal way to stabilize the diffraction color. Nevertheless, the magnetic field-responsive chromic capability will disappear because the ordered array structure is fixed by a polymer net. Consequently, considerable effort has been devoted to realizing color displays of polymers or hydrogels based on magnetic photonic chains exposed to various external stimuli. Many researchers have experimented with the manipulation of humidity with a saturated salt solution to drive color changes in magnetic polymers. [28][29][30] Other researchers have investigated the thermochromic display of magnetic hydrogels by changing their temperature with a water-bath control system. [31,32] However, nearly all of these previously explored stimuli require physical contact with the polymers or hydrogels, which may limit their applications. Therefore, new approaches for color displays of solidified magnetic polymers or hydrogels that operate in a contactless way are still anticipated.In this work, we develop a novel approach for magnetochromic displays with a solid magnetic photonic hydrogel. Color switching is initiated by an alternating magnetic field As an external stimulus for stimuli-responsive chromic materials, a magnetic field has the benefits of contactless control, instant action, and ease of integration into electronic devices. Hence, the development of a magnetically responsive photonic crystal provides a new platform for color displays. However, magnetically controlled display systems have been primarily limited to liquid systems of colloidal crystals; their application to solid chromic systems has been difficult because the ordered array structure is fixed by a polymer network. A novel solid magnetochromic photonic ...

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“…Hydrogel photonic crystals (HPCs) have attracted considerable interest due to the sensing to external stimuli, such as temperature, 1,2 pH, 3,4 ionic strength, 5 humidity, 6,7 mechanic forces 8,9 , metal ions 10,11 and molecules. 12,13 Generally, there are two fundamental types of HPCs, including polymerized crystalline colloidal array (PCCA) hydrogel photonic crystals 14 and inverse opal hydrogel (IOH) film deposited on a substrate.…”

Section: Introductionmentioning

confidence: 99%

Co-deposition motif for constructing inverse opal photonic crystals with pH sensing

et al. 2015

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a b c Removal of PSA Exfoliated polyacrylamide (PAM) inverse opal film had been fabricated based on co-deposition motif. AbstractPolyacrylamide (PAM) hydrogel photonic crystals with inverse-opal structure were elaborated using modified vertical deposition approach, in which co-deposition motif was involved. Free-standing inverse opal hydrogel (IOH) film with different thicknesses that peeled from the supporters was firstly fabricated. Three-dimensional ordered structure without over-layers could easily be acquired assisted by the co-deposition approach. And the bi-continuous structure could not be affected with the increase of film thickness. All of these IOH films showed fascinating pH response property after hydrolysis, and the color change corresponding to the shift of Bragg diffraction peak of the acquired hydrogel photonic crystal films can be easily 2 distinguished by the naked eye. Three types of IOH films with different thicknesses showed similar pH response property. Co-deposition approach is suitable for the construction of the thicker IOH film without over-layers.

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Visually readable and highly stable self-display photonic humidity sensor

Cited by 68 publications

References 44 publications

Bioinspired Stimuli‐Responsive Color‐Changing Systems

Bioinspired Stimuli‐Responsive Color‐Changing Systems

Magnetochromic Photonic Hydrogel for an Alternating Magnetic Field‐Responsive Color Display

Co-deposition motif for constructing inverse opal photonic crystals with pH sensing

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