Metal-dendrimer hybrid nanomaterials for sensing applications

Fernandes, Tiago; Daniel‐da‐Silva, Ana L.; Trindade, Tito

doi:10.1016/j.ccr.2022.214483

Cited by 25 publications

(19 citation statements)

References 310 publications

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“…Recently, flexible strain sensors have been intensively studied in the areas of electronic skins, − soft robots, − and human–computer interactions. − However, traditional strain sensors are mainly constructed by using mental composite materials or conductive polymers, which have poor ductility, stretchability, and self-healing properties. Moreover, most conductive materials lack self-adhesion, it is difficult for them to stably stick to human skin, and they are also easily damaged by external forces. − A conductive hydrogel, containing a 3D conductive polymeric network structure and maintaining a large volume of water without dissolving, has excellent stretchability, favorable flexibility, and considerable conductivity. It is considered to be one of the ideal alternative materials for the preparation of flexible strain sensors. , In practical applications, conductive hydrogels are usually required to possess various properties such as ultrahigh self-healing, strong adhesion, biocompatibility, and recyclability to adapt to the complex environments (e.g., underwater).…”

Section: Introductionmentioning

confidence: 99%

Tara Tannin-Cross-Linked, Underwater-Adhesive, Super Self-Healing, and Recyclable Gelatin-Based Conductive Hydrogel as a Strain Sensor

Liu

Fan

et al. 2022

Ind. Eng. Chem. Res.

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Conductive hydrogel strain sensors have triggered extensive research interest in artificial intelligence, human motion detection, electronic skin, and other technical fields. However, it is still challenging work to prepare conductive hydrogels integrated with good biocompatibility, recyclability, selfhealing, and strong adhesion properties both in air and underwater. Herein, a novel, ultraexcellent self-healing, adhesive, and multifunctional gelatin composite hydrogel was fabricated through a simple and rapid one-pot method in which gelatin (Gel) and polyvinyl alcohol (PVA) were used as the polymeric skeletons, Tara tannin as the cross-linking agent, and multiwalled carbon nanotubes (CNTs) as the conducting medium. Inspired by the vegetable tanning mechanism in tanning chemistry, the multiple hydrogen bonding and hydrophobic interactions of Tara tannin with Gel were used to build the crosslinking network of the hydrogel. The obtained GTPC (Gel-Tara tannin-PVA-CNTs) hydrogel exhibited considerable stretchability (760%), strong adhesion strength (16 kPa to pigskin), and high conductive sensitivity (gauge factor (GF) = 6.79). In particular, the GTPC hydrogel displayed good repeatable adhesion (≥10 times) and rapid self-healing performance (HE (self-healing efficiency) > 99%) both in air and underwater. The formed GTPC hydrogel strain sensor could accurately detect various motion signals, such as finger bending, ankle bending, and smiling, and it could also sensitively capture sensing signals of body movements underwater. The self-healed hydrogel sensor also exhibited a similar motion sensing ability to the original one. This work affords a new idea and method for the design and fabrication of flexible strain sensors with rapid air and underwater self-healing performance, high sensitivity, and strong adhesion (in air and water) by using vegetable tannin, promoting the underwater application of sensors and the diversified utilization of vegetable tannin.

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Section: Introductionmentioning

confidence: 99%

Tara Tannin-Cross-Linked, Underwater-Adhesive, Super Self-Healing, and Recyclable Gelatin-Based Conductive Hydrogel as a Strain Sensor

Liu

Fan

et al. 2022

Ind. Eng. Chem. Res.

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“…A significant application of the stimuli-responsive materials is development of chemosensors, and polymer nanoparticles are among the most significant carriers for this purpose. ,− Application of chemosensors based on polymer nanoparticles encountered some issues because of insolubility of polymers in aqueous media. Therefore, hydrophilic dendritic structures have gained much attention in the preparation of chemosensors applicable in aqueous media. ,,,− A new approach has recently been used for the development of chemosensors by doping photoactive or photoluminescent molecules into the dendrimer structure. In this strategy, the light-responsive molecules, such as photoluminescent and photochromic organic compounds, are incorporated into the structure of dendrimers by chemical or physical modification strategies.…”

Section: Resultsmentioning

confidence: 99%

“…A significant category of synthetic macromolecules is dendrimers or dendritic structures with a 3D-like molecular structure in the nanoscale. Dendritic macromolecules have lots of unique properties, which are well-defined nanostructures and unique morphologies, high concentration of functional groups at the surface, high solubility in aqueous media, high monodispersity, low viscosity, and modification ability with functional molecules. − These characteristics resulted in the development of dendritic nanostructures for a wide range of applications, including drug-delivery or gen-delivery systems, chemosensors, bioimaging, and tissue engineering. − Induction of stimuli-responsivity to dendrimers by their modification with intelligent molecules has been known as an attractive field of study. The pH- or temperature-responsive dendrimers are among the highly important smart nanocarriers in drug- or gen-delivery technology, − and the light-responsive dendrimers are highly applicable in bioimaging and photosensing applications. , Different types of dendrimers were modified with stimuli-responsive molecules using their surface functional groups, or in a classic approach, using a functional intelligent molecule as a core to growth of dendritic structures on the surface. − Therefore, the presence of acid, amine, or hydroxyl functional groups on dendrimers is inevitable for their reaction with functional molecules.…”

Section: Introductionmentioning

confidence: 99%

Stimuli-Responsive Dendritic Macromolecules for Optical Detection of Metal Ions and Acidic Vapors by the Photoinduced Electron Transfer Mechanism: Paper-Based Indicator for Food Spoilage Sensing

Razavi

Roghani‐Mamaqani

Salami‐Kalajahi

2022

ACS Appl. Mater. Interfaces

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Visual detection of analytes has been a significant challenge in the design and development of optical chemosensors. Sensing of analytes in aqueous solution by organic molecules has encountered some issues, such as poor water solubility and quenching of optical properties. In this study, a new category of smart dendritic macromolecules was designed and synthesized by functionalization of the poly(amidoamine) (PAMAM) dendrimer with spiropyran molecules to afford a photoluminescent dendritic structure (SP-PAMAM). Smart optical sensors were prepared by physical incorporation of four different oxazolidine derivatives containing hydroxyl and nitro substituted groups into the SP-PAMAM structure. Investigation of optical properties demonstrated photoinduced electron transfer (PET) between the spiropyran end group of SP-PAMAM and oxazolidine derivatives (in a concentration of about 0.0002 M), which can result in quenching of fluorescence emission of spiropyran photoswitch in the form of merocyanine (MC). Treatment of the oxazolidinedoped SP-PAMAM samples with metal ions resulted in changes in the PET mechanism (switching on or off), as observed in the case of Fe 3+ , Pb 2+ , Cu 2+ , Zn 2+ , Cd 2+ , Co 2+ , and Ni 2+ by different oxazolidine derivatives through various mechanisms (increase or decrease of fluorescence emission). These smart photoluminescent dendritic macromolecules have potential applications for photodetection of metal ions in aqueous media as optical chemosensors. In addition, the smart macromolecules displayed disconnection of PET between MC and oxazolidine and also showed red fluorescence emission under acidic conditions (pH 1−5). It is due to the protonation of the MC to MCH form and demonstrates a remarkable red shift in fluorescence spectra. The pH-responsivity of smart macromolecules was used for designing a paper-based pH indicator for visual detection of spoilage in the food industry, especially in the case of milk. The prepared papers applied on cap of the milk bottles did not show any fluorescence emission in the case of fresh milk; however, a red fluorescence emission was observed after milk spoilage as a result of adsorption of acidic volatile components generated by bacterial degradation and oxidation process on the paper surface. The reported smart papers can serve as optical portable pH indicators for timely detection of spoilage in food materials, which are usable in food packaging as smart indicator tags.

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“…Due to their unique structures and characteristics, dendrimers are suitable for a wide variety of applications in various fields such as: biomedicine [ 15 , 16 , 17 , 18 ], drug delivery [ 19 , 20 , 21 , 22 , 23 ], tissue engineering [ 24 , 25 ], catalysis [ 26 , 27 , 28 , 29 ], sensing [ 30 , 31 , 32 , 33 ], imaging [ 34 , 35 , 36 ], hybrid materials [ 37 , 38 ], and solar cells [ 39 , 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Properties and Bioapplications of Amphiphilic Janus Dendrimers: A Review

et al. 2023

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Amphiphilic Janus dendrimers are arrangements containing both hydrophilic and hydrophobic units, capable of forming ordered aggregates by intermolecular noncovalent interactions between the dendrimer units. Compared to conventional dendrimers, these molecular self-assemblies possess particular and effective attributes i.e., the presence of different terminal groups, essential to design new elaborated materials. The present review will focus on the pharmaceutical and biomedical application of amphiphilic Janus dendrimers. Important information for the development of novel optimized pharmaceutical formulations, such as structural classification, synthetic pathways, properties and applications, will offer the complete characterization of this type of Janus dendrimers. This work will constitute an up-to-date background for dendrimer specialists involved in designing amphiphilic Janus dendrimer-based nanomaterials for future innovations in this promising field.

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Metal-dendrimer hybrid nanomaterials for sensing applications

Cited by 25 publications

References 310 publications

Tara Tannin-Cross-Linked, Underwater-Adhesive, Super Self-Healing, and Recyclable Gelatin-Based Conductive Hydrogel as a Strain Sensor

Tara Tannin-Cross-Linked, Underwater-Adhesive, Super Self-Healing, and Recyclable Gelatin-Based Conductive Hydrogel as a Strain Sensor

Stimuli-Responsive Dendritic Macromolecules for Optical Detection of Metal Ions and Acidic Vapors by the Photoinduced Electron Transfer Mechanism: Paper-Based Indicator for Food Spoilage Sensing

Properties and Bioapplications of Amphiphilic Janus Dendrimers: A Review

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