Reversibly switchable ruthenium hybrid thermo-responsive electrocatalyst-based voltammetric sensor for sensitive detection of sulfamethazine in milk samples

Mutharani, Bhuvanenthiran; Chen, Shen‐Ming; Liu, Xiaoheng

doi:10.1016/j.snb.2020.128103

Cited by 34 publications

(21 citation statements)

References 27 publications

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“…The EF shows two-fold increase when the temperature rises to 45 °C and switches back when the temperature drops to 20 °C (Figure 4d). Based on the tunable gap of Au NPiBs and the sensitivity of SERS, various applications based on plasmonic hot spots are more functionalized, which opens many new opportunities for switchable catalysis [32,33] and photothermia. [34] For instance, the phase change of PNIPAM contracts the shells, which turns the vicinity of the metal cores hydrophobic.…”

Section: Resultsmentioning

confidence: 99%

Dynamic and Reversible Tuning of Particle‐in‐Bowl Shaped Plasmonic Resonators for Switchable Surface Enhanced Raman Scattering

Deng

Xiang

Wang

et al. 2021

Adv Materials Inter

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water splitting, [14] and biomedical diagnosis. [15] Among many of these designs, nanoparticle-in-void structure appears more attractive as it has a uniform hemispherical gap between the nanoparticle and the inner wall of the void, promising a much higher SERS enhancement and uniformity. [16,17] However, such a nanoscale hemispherical configuration with good uniformity poses great challenge to the traditional fabrication methods. Although drop-casting of nanoparticles and thermal dewetting of the metal films in ordered porous template can produce particles in the void, their morphology is not welldefined with lots of local defects. [18][19][20][21][22][23] The gap formed via electrochemical growth appears more uniform and controllable, [24] but the gap between the particle and the inner wall of nanobowl is fully filled, which has to resort to overcoating of another Ag films to boost its SERS performance. [25] Moreover, none of these structures are dynamically tunable, making it much less versatile.Ideally, the geometry of single Au nanoparticle in bowl (Au NPiB) with a proper space in between is desired to support plasmonic hot spots for SERS, which requires 1) matchable sizes between the Au nanovoids and the Au nanoparticles (AuNPs); 2) properly functionalized surfaces that hinder the aggregation of AuNPs during the assembly process; 3) monolayer of AuNPs to avoid random stacking. It is nontrivial to meet all these three requirements although it is quite easy to achieve one or two via conventional self-assembly or colloidal lithography.Here, we employ anodic aluminum oxide (AAO) as the nanobowl template, which are sputter-coated with Au films to generate Au nanobowl arrays. The size of these nanobowls is ≈80 nm which is slightly larger than the AuNPs (≈60 nm) used for self-assembly (Requirement 1). These AuNPs are coated with poly(N-isopropylamide) (PNIPAM), which not only provides steric hindrance against aggregation but also endows the thermal tunability of the plasmonic system (Requirement 2). The Au@PNIPAM NP monolayer assembled at liquidliquid interface is transferred to the Au nanobowl arrays via dip-coating so that each void of nanobowl is filled with just one Au@PNIPAM NP (Requirement 3). As the gap between the AuNP and the Au bowl is filled with PNIPAM, their separation can be reversibly tuned by simply controlling the Plasmonic nanoresonators made of particle-in-void have been considered as superior plasmonic cavities for surface enhanced Raman scattering (SERS). However, controlled fabrication of such plasmonic system and its dynamic tuning pose great challenges to traditional fabrication methods. Here, a capillary-driven self-assembly is proposed to form gold nanoparticles in bowls (Au NPiBs), which have a nm-gap filled with temperature-responsive polymers (poly(N-isopropylacrylamide)). As such, the plasmonic resonances of the Au NPiB nanostructures can be dynamically and reversibly tuned with the change of temperature due to the thermally induced expansion and contraction of the polymers. The SERS e...

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Section: Resultsmentioning

confidence: 99%

Dynamic and Reversible Tuning of Particle‐in‐Bowl Shaped Plasmonic Resonators for Switchable Surface Enhanced Raman Scattering

Deng

Xiang

Wang

et al. 2021

Adv Materials Inter

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“…Mutharani et al described an EC detection of the antibiotic medication sulfamethazine (SFZ) utilizing a microgel (poly(NIPAM-coMAA); MGC) containing Ru NPs-modified GCE (Ru@MGC/GCE). A simple precipitation polymerization process was used to create the microgel (MGC).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review of the Design of Ruthenium-Based Nanomaterials and Their Sensing Applications in Electrochemistry

Veerakumar

Hung

et al. 2022

J. Agric. Food Chem.

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In this review, ruthenium nanoparticles (Ru NPs)-based functional nanomaterials have attractive electrocatalytic characteristics and they offer considerable potential in a number of fields. Ru-based binary or multimetallic NPs are widely utilized for electrode modification because of their unique electrocatalytic properties, enhanced surface-area-to-volume ratio, and synergistic effect between two metals provides as an effective improved electrode sensor. This perspective review suggests the current research and development of Ru-based nanomaterials as a platform for electrochemical (EC) sensing of harmful substances, biomolecules, insecticides, pharmaceuticals, and environmental pollutants. The advantages and limitations of mono-, bi-, and multimetallic Rubased nanocomposites for EC sensors are discussed. Besides, the relevant EC properties and analyte sensing approaches are also presented. On the basis of these insights, we highlighted recent results for synthesizing techniques and EC environmental pollutant sensors from the perspectives of diverse supports, including graphene, carbon nanotubes, silica, semiconductors, metal sulfides, and polymers. Finally, this work overviews the modern improvements in the utilization of Ru-based nanocomposites on the basis for electroanalytical sensors as well as suggestions for the field's future development.

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“…Thermo-responsive polymer materials, especially hydrogels, are of great significance for creating intelligent/functional systems/ materials. [1][2][3][4] Poly(N-isopropylacrylamide) (PNIPAm) shows an obvious volume phase transition behavior in aqueous media with a lower critical solution temperature (LCST) near 32 °C. 5,6 PNIPAm chains hydrate to form loose coils in aqueous media when the temperature is below its LCST, and dehydrate to form compact globular structures when the temperature is above its LCST, accompanied by a transition from hydrophilicity to hydrophobicity of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Thermo-responsive, mechanically robust and 3D printable supramolecular hydrogels

Wang

Guo

2022

Polym. Chem.

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Reversibly switchable ruthenium hybrid thermo-responsive electrocatalyst-based voltammetric sensor for sensitive detection of sulfamethazine in milk samples

Cited by 34 publications

References 27 publications

Dynamic and Reversible Tuning of Particle‐in‐Bowl Shaped Plasmonic Resonators for Switchable Surface Enhanced Raman Scattering

Dynamic and Reversible Tuning of Particle‐in‐Bowl Shaped Plasmonic Resonators for Switchable Surface Enhanced Raman Scattering

Review of the Design of Ruthenium-Based Nanomaterials and Their Sensing Applications in Electrochemistry

Thermo-responsive, mechanically robust and 3D printable supramolecular hydrogels

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