Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Wong, Priscilla Chui Hong; Santhanam, K. S. V.; Kandlikar, Satish G.

doi:10.1149/2.0041807jes

Cited by 3 publications

(3 citation statements)

References 80 publications

(135 reference statements)

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“…7647-14-5, ACS, 100 wt %] and Sodium sulfate anhydrous [CAS 7757-82-6, ACS grade, 99.99%] were procured from EMD Millipore Company. Graphene quantum dots were prepared as reported in the literature [24][25][26][27]. The sample conformed to the specifications of graphene given in the earlier publications from Raman spectrum, FTIR and UV-VIS spectrum.…”

Section: Methodsmentioning

confidence: 99%

Corrosion Protection of Monel Alloy Coated with Graphene Quantum Dots Starts with a Surge

Bopp

Santhanam

2019

ChemEngineering

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There has been an active interest in protecting metals and alloys using graphene coating. The mechanism by which corrosion protection occurs has not been well understood as the couple involved are both good electron conductors. In this work, we demonstrate that Monel alloy coated with graphene quantum dots (GQD) changes the corrosion rate with a surge (increase) caused by the galvanic coupling of the two materials. This surge results in the protective layer formation on Monel to inhibit the corrosion. X-ray fluorescence spectrum of Monel (400) alloy showed the composition of it as Ni (67.05%) and Cu (29.42%). The Tafel experiments carried out in NaCl and Na2SO4 electrolytes showed an initial enhancement of the corrosion rate followed by a decrease upon successive polarizations. Monel coated with graphene oxide (an insulator) shows no initial enhancement of corrosion rate; the coated samples showed a lower corrosion rate in comparison to the uncoated samples. X-ray fluorescence, Fourier Transform spectroscopy (FTIR) and Raman imaging studies have been carried out for understanding this transformation. Distinct peaks due to Ni-O stretching and Ni-O-H bending vibration were observed in the FTIR spectrum.

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Section: Methodsmentioning

confidence: 99%

Corrosion Protection of Monel Alloy Coated with Graphene Quantum Dots Starts with a Surge

Bopp

Santhanam

2019

ChemEngineering

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“…Figure 16 gives the plot of CV peak current vs norovirus concentration. Graphene which has been established to have fast electron transfer property and high chemical stability (Protich, Santhanam, et al, 2016;Protich, Wong, et al, 2016;Wong et al, 2018) was used for constructing real-time rapid sensor for the pathogenic rotavirus. The specific rotavirus antibodies are covalently attached to the graphene surface after adsorbing F I G U R E 1 5 Binding affinity between modified AG3 with MNV using polycarbonate filter binding assay ( ) and fluorescence anisotropy ( ).…”

Section: Re Vie W Of the Re Sultsmentioning

confidence: 99%

Electrochemical approaches towards sensing viruses: A mini review

Santhanam

2020

Med Devices & Sens

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The world is exposed to a large number of pathogens that are primarily responsible for variety of diseases in humans and animals. These pathogens are divided into five broad categories such as viruses, bacteria, fungi, protozoa and worms. They enter the human body and utilize the body's resources to replicate, before exiting and infecting a new host, while weakening the immune system. In the class of pathogens, viruses are unique in that they kill host cells. We have been threatened by pathogens for centuries and our ability to reduce morbidity becomes obvious when we examine our average life span. Life expectancy of humans in the early 19th century was 40 years, which increased to 58 years in 1950 and then to 72 years in 1972. This gradual increase is due to better understanding of the biology of these pathogens, along with established methods for their detection and treatment. In 1940, influenza viruses A and B were detected and two vaccine protections against them were discovered in 1942. The H2N2 virus of 1957 resulted in deaths globally and led to the discovery of an antiviral medication in 1966. Another pandemic caused by H3N2 influenza virus resulted in several deaths in the United States and worldwide. The 2009 human influenza A H1N1 virus caused an annual global attack rate of 5%-10% in adults and 20%-30% in children; in one year (April 2009 to April 2010), 60.8 million cases were identified with a large number of deaths occurring in USA (https://www.cdc.gov/flu/pande mic-resou rces/2009-h1n1-pande mic.html, https://www.cdc.gov/flu/pande mic-resou rces/pande mic-timel ine-1930-and-beyond.html). Influenza virus infection occurred via inhalation of virus laden particles or direct contact with virus contaminated surfaces (Choi et al., 2002; Couch, 2003). The solution to the problem of virus attack is to detect them with precautions to suitably control or eliminate them. This review is oriented towards the detection of the viruses. 2 | ME THODOLOGY FOR DE TEC TION OF VIRUS E S Historically, respiratory virus infections have been diagnosed by a combination of techniques such as enzyme immune assay, direct fluorescence antibody, staining, cell culture and nucleic acid amplification

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“…The 2D monolayer underpotential deposition of Cu has provided an advantage for the control of the Au nanoparticles [25] and the 2Dto-3D transition has been studied by potentiodynamic studies. The nucleation processes in the deposition of copper, zinc, and cobalt in graphene quantum dot baths have been discussed for understanding the mechanism [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition from a Graphene Bath: A Sustainable Copper Composite Alloy in a Graphene Matrix

Richardson

Bopp

et al. 2020

J. Compos. Sci.

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The leaching effect of metals has led to the introduction of government regulations for the safety of the environment and humans. This has led to the search for new alloys with long-lasting sustainability. Herein, we wish to report a new brass alloy containing carbon with a remarkable sustainability produced by electrodeposition from a graphene quantum dots bath. The electrochemical measurements were carried out using cyclic voltammetry, potentiodynamic analysis, and Tafel measurements, and the deposits were characterized by X-ray fluorescence spectroscopy (XRF), Raman imaging, X-ray diffraction (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM) to understand the surface morphology and elemental compositions. The current–time transients in the potential-step electrolysis were used to investigate the nucleation and growth mechanism. The smooth and compact deposit obtained at −0.60 V showed a composition of Cu = 24.33 wt %; Zn = 0.089 wt %; and C = 75.57 wt %. The SEM and energy dispersion X-ray analysis revealed a surface morphology with a uniform distribution of the particles and the presence of Cu, Zn, and C. The corrosion density of the material is very much lower than that of conventional brass, suggesting a higher sustainability.

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Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Cited by 3 publications

References 80 publications

Corrosion Protection of Monel Alloy Coated with Graphene Quantum Dots Starts with a Surge

Corrosion Protection of Monel Alloy Coated with Graphene Quantum Dots Starts with a Surge

Electrochemical approaches towards sensing viruses: A mini review

Electrodeposition from a Graphene Bath: A Sustainable Copper Composite Alloy in a Graphene Matrix

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