Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

Giovannini, Giorgia; Rossi, René M.; Boesel, Luciano F.

doi:10.3390/nano11010197

Cited by 8 publications

(13 citation statements)

References 59 publications

(40 reference statements)

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“…In this study, the effect of combining metallic structures and MMT is particularly evident considering the low enhancement observed with the MMT. As observed in our previous work [9], the fluorescent enhancement achieved using MMT is related to the amount of clay employed as well as to the concentration of the dye. In this work, we used a low concentration of MMT (0.1 wt%) and pico-and nano-molar concentrations of FITC.…”

Section: Fluorescence-based Detection Of Fitc With Ag_mmtsupporting

confidence: 70%

“…The changes in the optical properties of dyes upon interaction with MMT are well documented in other papers. The fluorescent enhancement observed with MMT has been mainly associated with the restriction of intermolecular rotation (RIR) and aggregation-induced emission (AIE) phenomenon which can occur after dye-particle interaction [9]. However, the mechanism of signal harvesting varies depending on the optical and physical properties of the molecules studied as we discussed in our previous work.…”

Section: Introductionmentioning

confidence: 92%

“…However, the mechanism of signal harvesting varies depending on the optical and physical properties of the molecules studied as we discussed in our previous work. Taking advantage of the remarkable fluorescent enhancement achieved after dye-MMT interaction, we recently proposed the use of clay-organic hybrids for the development of fluorescence-based platforms for sensing biological compounds [9].…”

Section: Introductionmentioning

confidence: 99%

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Metal-Modified Montmorillonite as Plasmonic Microstructure for Direct Protein Detection

Giovannini

Garoli

Rupper

et al. 2021

Sensors

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Thanks to its negative surface charge and high swelling behavior, montmorillonite (MMT) has been widely used to design hybrid materials for applications in metal ion adsorption, drug delivery, or antibacterial substrates. The changes in photophysical and photochemical properties observed when fluorophores interact with MMT make these hybrid materials attractive for designing novel optical sensors. Sensor technology is making huge strides forward, achieving high sensitivity and selectivity, but the fabrication of the sensing platform is often time-consuming and requires expensive chemicals and facilities. Here, we synthesized metal-modified MMT particles suitable for the bio-sensing of self-fluorescent biomolecules. The fluorescent enhancement achieved by combining clay minerals and plasmonic effect was exploited to improve the sensitivity of the fluorescence-based detection mechanism. As proof of concept, we showed that the signal of fluorescein isothiocyanate can be harvested by a factor of 60 using silver-modified MMT, while bovine serum albumin was successfully detected at 1.9 µg/mL. Furthermore, we demonstrated the versatility of the proposed hybrid materials by exploiting their plasmonic properties to develop liquid label-free detection systems. Our results on the signal enhancement achieved using metal-modified MMT will allow the development of highly sensitive, easily fabricated, and cost-efficient fluorescent- and plasmonic-based detection methods for biomolecules.

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Section: Fluorescence-based Detection Of Fitc With Ag_mmtsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metal-Modified Montmorillonite as Plasmonic Microstructure for Direct Protein Detection

Giovannini

Garoli

Rupper

et al. 2021

Sensors

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“…Very common and effective methods include the functionalization with adsorbed cationic surfactants or polyelectrolytes. In this way, it is possible to achieve the adsorption of even anionic or neutral chromophores. − Using the modification of silicates with oppositely charged polyelectrolyte or surfactant molecules, it is possible to tune the surface charge of silicates . In addition to the regulation of their charge, hydrophilic vs hydrophobic properties of the silicate surfaces can also be controlled by the adsorption of surfactants. , …”

Section: Discussionmentioning

confidence: 99%

“…This well-known solvatochromic dye has been considered as a nonluminescent zwitterionic substance with negatively charged phenolate and positively charged pyridinium groups in its aqueous solution. As it was already mentioned earlier, in order to have systems applicable for neutral dyes, it is necessary to modify the surface of the silicate particles through the adsorption of polyelectrolytes , or surfactants . These types of surface functionalization of the silicate substrate can help to achieve such desired properties as the controlled charge density and topography of the surface.…”

Section: Discussionmentioning

confidence: 99%

Adsorption of Dye Molecules and Its Potential for the Development of Photoactive Hybrid Materials Based on Layered Silicates

et al. 2023

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The present paper gives a brief account of the latest advances in understanding of the mechanism and implications of dye adsorption with a special focus on layered silicate surfaces. It has been clearly demonstrated that the controlled adsorption of novel or already well-known dyes has equally great yet unexplored potential. In principle, the well-engineered surface confinement of the molecules may lead to their aggregation, adsorption, or intercalation-induced fluorescence emission even with conventional dyes, which are not considered as luminophores in solutions or in the solid state. We envision the utilization of silicate-based heterogeneous systems to produce novel polymer blended films or structured liquids, as well as to develop a plethora of other photophysical and biomedical applications.

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Lab‐on‐a‐Fiber Wearable Multi‐Sensor for Monitoring Wound Healing

Giovannini,

Sharma,

Boesel

et al. 2023

Adv Healthcare Materials

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Chronic wounds are regarded as a silent epidemic, affecting 1–2% of the population and representing 2–4% of healthcare expenses. The current methods used to assess the wound healing process are based on the visual evaluation of physical parameters. This work aims to design a wearable non‐invasive device capable of evaluating three parameters simultaneously: the pH and the levels of glucose and matrix metalloproteinase (MMP) present in the wound exudate. The device is composed of three independent polymer optical fibers functionalized with fluorescent‐based sensing chemistries specific to the targeted analytes. Each fiber is characterized in terms of detection sensitivity and selectivity confirming their suitability for monitoring the targeted parameters in ranges relevant to the wound environment. The selectivity and robustness of the multi‐sensing device are confirmed with analyses using complex solutions with different pH levels (5, 6, and 7), different concentrations of glucose (1.25, 2.5, and 5 mm), and MMP (1.25, 2.5, and 5 µg mL−1). Given the simple set‐up, the affordability of the materials used and the possibility of detecting additional parameters relevant to wound healing, such multi‐sensing fiber‐based devices could pave the way for novel non‐invasive wearable tools enabling the assessment of wound healing from the molecular perspective.

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Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

Cited by 8 publications

References 59 publications

Metal-Modified Montmorillonite as Plasmonic Microstructure for Direct Protein Detection

Metal-Modified Montmorillonite as Plasmonic Microstructure for Direct Protein Detection

Adsorption of Dye Molecules and Its Potential for the Development of Photoactive Hybrid Materials Based on Layered Silicates

Lab‐on‐a‐Fiber Wearable Multi‐Sensor for Monitoring Wound Healing

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