Electrochemistry, Nanomaterials, and Nanostructures

Bueno, Paulo Agenor Alves; Gabrielli, C.

doi:10.1007/978-0-387-49323-7_3

Cited by 6 publications

(10 citation statements)

References 215 publications

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“…The electrochemical interrogation of redox-accessible thin films at engineered interfaces, more generally, constitutes a potentially powerful means of studying fundamental aspects of interfacial electron transfer. − In seeking to address the commonly distorting and low signal-to-noise characteristics of standard electrochemical methodologies, we have recently introduced impedance-derived capacitance spectroscopy as a means of accessing, in a frequency-resolved manner, faradaic (redox) features free from the (otherwise inherent) distorting and distracting resistive and capacitive effects caused by ionic polarization and other nonfaradaic phenomena (see Figure c) . Herein, the redox centers and faradaic activity should be treated as synonymous with metallic states (Fermi levels) and the resonant communication of these with confined orbital states.…”

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confidence: 99%

“…15,16,20,24 The main purpose of the current work is to demonstrate that the charging of a film constraining electrochemical (or redox) accessible orbitals is fundamentally and resolvably associated with a communication between a metal density of states, DOS (i.e., considered to be infinite in magnitude) and individual quantized energy levels (associated with a small finite DOS) that, en masse, constitute a population DOS that can be energetically mapped by capacitance spectroscopy. 15,16,22,24 It will be additionally demonstrated that electrochemical capacitance obtained from these spectroscopic analyses is divisible into electrostatic and quantum components (see Let us start with a brief review of the energy storage associated with the application of a DC voltage (V dc ) across parallel metallic plates spanning a dielectric. As depicted in Figure 2a, the initially equalized Fermi energies diverge by the sums of edV l and edV r for the left and right electrodes, respectively.…”

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confidence: 99%

“…In taking the derivative of eq 5 with respect to μ e (and assuming that q = ne, where n = fΓ), C r , 15,16,24 for a single redox energy state E r , can be given by (noting that the derivative of eq 5 with respect to μ e is df/dμ As can be noted, there is no apparent changes so that there is little suitable information in impedance representation as discussed in the previous work. 16,22 (b) The analogous capacitative Nyquist response (obtained by using the Z* = 1/jωC* relationship to convert the complex impedance function into capacitance; see the Supporting Information and refs 16 and 22 for more detail) where the impact of solvent static dielectric constant on experimentally resolved C r spread is clear. C e (and therefore experimental C r ) is intrinsically associated with a dielectric constant, according to dielectric theory.…”

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confidence: 99%

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Measuring Quantum Capacitance in Energetically Addressable Molecular Layers

2014

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The Fermi level or electrochemical signature of a molecular film containing accessible orbital states is ultimately governed by two measurable series energetic components, an energy loss term related to the charging of appropriately addressable molecular orbitals (resonant or charge transfer resistance), and an energy storage or electrochemical capacitance component. The latter conservative term is further divisible into two series contributions, one being a classic electrostatic term and the other arising from the involvement and charging of quantized molecular orbital states. These can be tuned in and out of resonance with underlying electrode states with an efficiency that governs electron transfer kinetics and an energetic spread dependent on solution dielectric. These features are experimentally resolved by an impedance derived capacitance analysis, a methodology which ultimately enables a convenient spectroscopic mapping of electron transfer efficacy, and of density of states within molecular films.

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Measuring Quantum Capacitance in Energetically Addressable Molecular Layers

2014

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“…167,168 However, metal-based catalysts are costly to use and they also show low selectivity and durability. Carbonaceous materials are relatively inexpensive metal-free catalysts and are an alternative to the bench mark Pt catalysts.…”

Section: Application Of 2d Nanomaterials In Electrochemistrymentioning

confidence: 99%

Two-Dimensional (2D) Nanomaterials towards Electrochemical Nanoarchitectonics in Energy-Related Applications

Khan

Ghosh

Pradhan

et al. 2017

Bulletin of the Chemical Society of Japan

398

197

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includes self-assembled fullerene crystals design from zero-to-higher dimensions, mesoporous fullerene crystals and their conversion into graphitic mesoporous carbons, high surface area nanoporous carbon material design from agro-waste for electrochemical supercapacitors and VOC adsorption. Somobrata AcharyaSomobrata Acharya received his Ph.D. degree from Jadavpur University, India. He is currently Associate Professor in the Centre for Advanced Materials (CAM), Indian Association for the Cultivation of Science (IACS), India. He is carrying out research in interdisciplinary areas probing structure-property relationship and possible applications of semiconductor nanomaterials in the areas of energy generation and consumption. His research area includes heterostructures, 2D nanostructures, superlattices, supramolecular assemblies and their suitable applications. Katsuhiko ArigaKatsuhiko Ariga received his Ph.D. degree from Tokyo Institute of Technology. He is currently the Director of Supermolecules Group and Principal Investigator of World Premier International (WPI) Research Centre for Materials Nanoarchitectonics (MANA), the National Institute for Materials Science (NIMS). His research is oriented to supramolecular chemistry, surface science, and functional nanomaterials (Langmuir-Blodgett film, layer-by-layer assembly, self-organized materials, sensing and drug delivery, molecular recognition, mesoporous material, etc. and he is now trying to combine them into a unified field. AbstractDesigning nanoscale components and units into functional defined systems and materials has recently received attention as a nanoarchitectonics approach. In particular, exploration of nanoarchitectonics in two-dimensions (2D) has made great progress these days. Basically, 2D nanomaterials are a center of interest owing to the large surface areas suitable for a variety of surface active applications. The increasing demands for alternative energy generation have significantly promoted the rational design and fabrication of a variety of 2D nanomaterials since the discovery of graphene. In 2D nanomaterials, the charge carriers are confined along the thickness while being allowed to move along the plane. Owing to the large planar area, 2D nanomaterials are highly sensitive to external stimuli, a characteristic suitable for a variety of surface active applications including electrochemistry. Because of the unique

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“…This can be attributed to the high surface area of nanofibers which promotes enhanced interfacial electron transfer facilitated by strong local electric field gradient [49,50]. However, R ct gradually increased upon tyrosinase immobilization on the nanofibers (C/α-MnO 2 /tyrosinase); which can be attributed to the insulating nature of the enzyme thereby passivating the electrode surface [24].…”

Section: Tyrosine Sensing Performance Of Smart Band-aidmentioning

confidence: 99%

Electroanalytical Sensor for Diabetic Foot Ulcer Monitoring with Integrated Electronics for Connected Health Application

et al. 2020

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L‐tyrosine is an amino acid, the concentration of which is found to be highly elevated in patients suffering from diabetic foot ulcer (DFU). The latter proves to be fatal when it turns out chronic and may lead to amputation. The conventional clinical diagnostic methods are costly and time consuming, in which case, the condition of patient(s) may deteriorate long before proper treatment commences. Herein, we report the development of smart band‐aid for real time monitoring of L‐tyrosine by employing enzymatic bio‐sensor using α‐MnO2/tyrosinase. The smart band‐aid was further integrated with portable electronics capable of wireless data transmission to a personal digital assistant, and its tyrosine sensing performance was evaluated. Anodic current was found to vary linearly with the concentrations of L‐tyrosine in the range of 5 nM–500 μM. The developed sensor displayed a limit of detection and sensitivity of 0.71 nM and 0.67 μA/nM/mm2 respectively, with a stability of 25 days. The developed sensor was validated using a commercial impedance analyzer. The impedance response was found to be consistent with the cyclic voltammogram obtained and demonstrated to be a linear function of tyrosine concentration. The developed sensing platform combines early diagnosis with connected health technologies, thus, fitting well into modern healthcare needs.

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Electrochemistry, Nanomaterials, and Nanostructures

Cited by 6 publications

References 215 publications

Measuring Quantum Capacitance in Energetically Addressable Molecular Layers

Measuring Quantum Capacitance in Energetically Addressable Molecular Layers

Two-Dimensional (2D) Nanomaterials towards Electrochemical Nanoarchitectonics in Energy-Related Applications

Electroanalytical Sensor for Diabetic Foot Ulcer Monitoring with Integrated Electronics for Connected Health Application

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