Plasmonic‐Based Mechanochromic Microcapsules as Strain Sensors

Burel, Céline; Alsayed, Ahmed; Malassis, Ludivine; Murray, Christopher B.; Donnio, Bertrand; Dreyfus, Rémi

doi:10.1002/smll.201701925

Cited by 27 publications

(50 citation statements)

References 46 publications

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“…This enables mechanical control of the plasmonic coupling and electromagnetic fields at the surface. Dreyfus and coworkers designed mechanochromic AuNP-decorated microparticles as strain sensor ( Figure 3E) [59]. After dispersion in an elastic polymer matrix of PVA, the capsules change in color upon elongation.…”

Section: Lspr Spectroscopy Of Ordered Np Assemblies and Defined Pattementioning

confidence: 99%

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Kuttner¹

2018

Plasmonics

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This chapter gives a brief overview of plasmonic nanoparticle (NP)-based sensing concepts ranging from classical spectral-shift colorimetry to the highly active field of surface-enhanced Raman scattering (SERS) spectroscopy. In the last two decades, colloidal approaches have developed significantly. This is seen with, for example, refractive-index sensing, detection of ad−/desorption and ligand-exchange processes, as well as ultrasensitive chemical sensing utilizing well-defined nanocrystals or discrete self-assembled superstructures in 2D and 3D. Apart from individual NPs, the rational design of self-assembled nanostructures grants spectroscopic access to unprecedented physicochemical information. This involves selected research examples on molecular trapping, ligand corona analysis, SERS-encoding, and biosensing. The origin of the SERS effect, also in regard to hot spot formation by off-resonant excitation, is reviewed and discussed in the context of the current challenge to formulate a generalized metric for high SERS efficiency. Special emphasis lies in addressing the fundamental design criteria and the specific challenges of these particle-based sensing techniques.

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Section: Lspr Spectroscopy Of Ordered Np Assemblies and Defined Pattementioning

confidence: 99%

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Kuttner¹

2018

Plasmonics

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“…Materials capable of revealing spatial distributions of stresses and strains by optical means incorporate structures which activate mechanically to produce distinctive optical signatures, such as color change (mechanochromism), [ 4–7 ] the onset of or change in fluorescence (mechanofluorochromism), [ 4,8–10 ] or the emission of a photon (mechanoluminescence). [ 11,12 ] The mechanisms resulting in this responsivity operate on length scales ranging from 10 µm to the molecular level, including periodicity changes in photonic elastomers and gels, [ 5,13,14 ] nanoparticle rearrangement in plasmonic materials, [ 15 ] disruption of aggregachromic dyes, [ 6,16 ] stretching of conjugated polymers, [ 10 ] and the scission of weak covalent bonds (as in mechanophores). [ 4,8,11,12 ] Compared to other mechanical detection methods, such as electrical read‐outs, [ 17 ] optically based approaches offer excellent spectral, spatial, and temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Cephalopod‐Inspired High Dynamic Range Mechano‐Imaging in Polymeric Materials

Clough

Gucht

Kodger

et al. 2020

Adv Funct Materials

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Cephalopods, such as squid, cuttlefish, and octopuses, use an array of responsive absorptive and photonic dermal structures to achieve rapid and reversible color changes for spectacular camouflage and signaling displays. Challenges remain in designing synthetic soft materials with similar multiple and dynamic responsivity for the development of optical sensors for the sensitive detection of mechanical stresses and strains. Here, a high dynamic range mechano‐imaging (HDR‐MI) polymeric material integrating physical and chemical mechanochromism is designed providing a continuous optical read‐out of strain upon mechanical deformation. By combining a colloidal photonic array with a mechanically responsive dye, the material architecture significantly improves the mechanochromic sensitivity, which is moreover readily tuned, and expands the range of detectable strains and stresses at both microscopic and nanoscopic length scales. This multi‐functional material is highlighted by creating detailed HDR mechanographs of membrane deformation and around defects using a low‐cost hyperspectral camera, which is found to be in excellent agreement with the results of finite element simulations. This multi‐scale approach to mechano‐sensing and ‐imaging provides a platform to develop mechanochromic composites with high sensitivity and high dynamic mechanical range.

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“…The Au NPs obtained are polydispersed, the mean diameter d is d = 30 nm ± 11 nm and the PVP‐DADMAN capping layer is about 1.5 nm (TEM images, histogram of size distribution, and extinction spectrum of the Au NPs can be found in Figures S2 in the Supporting Information). In this size range, the polydispersity does not affect the position of the plasmonic peak but results in a small broadening of the peak . Then, a solution of toluene containing a mixture of methyl methacrylate (MMA) and butyl acrylate (BA) (50:50 w/w) monomers is emulsified in a continuous aqueous phase of the previously synthesized Au NPs.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Elastic Capsules as Colorimetric Reversible pH‐Microsensors

Burel

Teolis

Alsayed

et al. 2020

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There is a crucial need for effective and easily dispersible colloidal microsensors able to detect local pH changes before irreversible damages caused by demineralization, corrosion, or biofilms occur. One class of such microsensors is based on molecular dyes encapsulated or dispersed either in polymer matrices or in liquid systems exhibiting different colors upon pH variations. They are efficient but often rely on sophisticated and costly syntheses, and present significant risks of leakage and photobleaching damages, which is detrimental for mainstream applications. Another approach consists of exploiting the distance‐dependent plasmonic properties of metallic nanoparticles. Still, assembling nanoparticles into dispersible colloidal pH‐sensitive sensors remains a challenge. Here, it is shown how to combine optically active plasmonic gold nanoparticles and pH‐responsive thin shells into “plasmocapsules.” Upon pH change, plasmocapsules swell or shrink. Concomitantly, the distance between the gold nanoparticles embedded in the polymeric matrix varies, resulting in an unambiguous color change. Billions of micron‐size sensors can thus be easily fabricated. They are nonintrusive, reusable, and sense local pH changes. Each plasmocapsule is an independent reversible microsensor over a large pH range. Finally, their potential use for the detection of bacterial growth is demonstrated, thus proving that plasmocapsules are a new class of sensing materials.

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Plasmonic‐Based Mechanochromic Microcapsules as Strain Sensors

Cited by 27 publications

References 46 publications

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Cephalopod‐Inspired High Dynamic Range Mechano‐Imaging in Polymeric Materials

Plasmonic Elastic Capsules as Colorimetric Reversible pH‐Microsensors

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