Photonic hydrogel sensors

Yetisen, Ali K.; Butt, Haider; Volpatti, Lisa R.; Pavlichenko, Ida; Humar, Matjaž; Kwok, Sheldon J. J.; Koo, Heebeom; Kim, Ki Su; Naydenova, Izabela; Khademhosseini, Ali; Hahn, Sei Kwang; Yun, Seok Hyun

doi:10.1016/j.biotechadv.2015.10.005

Cited by 170 publications

(129 citation statements)

References 298 publications

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“…[101,102] Meanwhile, such periodically ordered colloidal particles can also act as removable templates so that ordered macroporous structures of hydrogels can be constructed (Figure 7a). [103][104][105][106][107][108][109] The size of the macropores can be easily controlled by tuning the diameter of the colloidal particle templates. Because of the features of the ordered porous structures, macroporous hydrogels hold immense promise as a unique platform for application for tissue-engineering scaffolds and sensors.…”

Section: Self-assemblymentioning

confidence: 99%

Bioinspired Nanocomposite Hydrogels with Highly Ordered Structures

et al. 2017

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In the human body, many soft tissues with hierarchically ordered composite structures, such as cartilage, skeletal muscle, the corneas, and blood vessels, exhibit highly anisotropic mechanical strength and functionality to adapt to complex environments. In artificial soft materials, hydrogels are analogous to these biological soft tissues due to their “soft and wet” properties, their biocompatibility, and their elastic performance. However, conventional hydrogel materials with unordered homogeneous structures inevitably lack high mechanical properties and anisotropic functional performances; thus, their further application is limited. Inspired by biological soft tissues with well‐ordered structures, researchers have increasingly investigated highly ordered nanocomposite hydrogels as functional biological engineering soft materials with unique mechanical, optical, and biological properties. These hydrogels incorporate long‐range ordered nanocomposite structures within hydrogel network matrixes. Here, the critical design criteria and the state‐of‐the‐art fabrication strategies of nanocomposite hydrogels with highly ordered structures are systemically reviewed. Then, recent progress in applications in the fields of soft actuators, tissue engineering, and sensors is highlighted. The future development and prospective application of highly ordered nanocomposite hydrogels are also discussed.

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Section: Self-assemblymentioning

confidence: 99%

Bioinspired Nanocomposite Hydrogels with Highly Ordered Structures

et al. 2017

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“…Bragg grating-based hydrogel sensors as well as hydrogel microlenses are utilized as optical sensors. In both cases, a significant change in the refractive index or rather high diffraction efficiency is required to ensure good functionality [51]. Substantial benefits of holographic patterning concern the fabrication flexibility.…”

Section: Biomedicinementioning

confidence: 99%

Volume Holography: Novel Materials, Methods and Applications

Sabel¹,

Lensen²

2017

Holographic Materials and Optical Systems

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This chapter aims to establish a link between material compositions, analytical methods and advanced applications for volume holography. It provides basics on volume holography, serving as a compendium on volume holographic grating formation, specific material requirements for volume holography and diffractive properties of the different types of volume holographic gratings. The particular significance of three-dimensional optical structuring for the final optical functionality is highlighted. In this context, the interrelation between function and structure of volume holograms is investigated with view to research on and development of novel materials, methods and applications. Particular emphasis will be placed on analytical methods, assuming that they provide access for a deeper understanding of volume holographic grating formation, which appears to be prerequisite for the design of novel material systems for advanced applications.

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“…It has the ability to swell in the presence of humidity. In addition to hydrogels offering improvements in sensitivity, selectivity and response time, their compatibility with printable technology at extremely low cost makes them an attractive material for sensing applications33. Often used as sensing layer in optical-based sensing devices3435, within this work, we integrated them in electrically transduced sensors.…”

Section: Example Of Application: Humidity Sensingmentioning

confidence: 99%

Piezoelectric polymer gated OFET: Cutting-edge electro-mechanical transducer for organic MEMS-based sensors

Thuau

Abbas

Wantz

et al. 2016

Sci Rep

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The growth of micro electro-mechanical system (MEMS) based sensors on the electronic market is forecast to be invigorated soon by the development of a new branch of MEMS-based sensors made of organic materials. Organic MEMS have the potential to revolutionize sensor products due to their light weight, low-cost and mechanical flexibility. However, their sensitivity and stability in comparison to inorganic MEMS-based sensors have been the major concerns. In the present work, an organic MEMS sensor with a cutting-edge electro-mechanical transducer based on an active organic field effect transistor (OFET) has been demonstrated. Using poly(vinylidenefluoride/trifluoroethylene) (P(VDF-TrFE)) piezoelectric polymer as active gate dielectric in the transistor mounted on a polymeric micro-cantilever, unique electro-mechanical properties were observed. Such an advanced scheme enables highly efficient integrated electro-mechanical transduction for physical and chemical sensing applications. Record relative sensitivity over 600 in the low strain regime (<0.3%) was demonstrated, which represents a key-step for the development of highly sensitive all organic MEMS-based sensors.

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Photonic hydrogel sensors

Cited by 170 publications

References 298 publications

Bioinspired Nanocomposite Hydrogels with Highly Ordered Structures

Bioinspired Nanocomposite Hydrogels with Highly Ordered Structures

Volume Holography: Novel Materials, Methods and Applications

Piezoelectric polymer gated OFET: Cutting-edge electro-mechanical transducer for organic MEMS-based sensors

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