Variations in thermo-optical properties of neutral red dye with laser ablated gold nanoparticles

Prakash, A. P. Gnana; Pathrose, Bini P.; Mathew, S.; Nampoori, V. P. N.; Radhakrishnan, P.; Mujeeb, A.

doi:10.1016/j.optmat.2018.03.044

Cited by 16 publications

(11 citation statements)

References 25 publications

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“…Neutral red belonging to the quinone imine class of dyes is a lysosomal probe and biological pH indicator. It is utilized in the optoelectronic field . To overcome some of the limitations of organic dyes such as photobleaching and quenching, the optical properties of synthesized Zn 3 N 2 nanoparticles integrated with aforementioned dye molecules were analyzed in detail.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Emission of Zinc Nitride Colloidal Nanoparticles with Organic Dyes for Optical Sensors and Imaging Application

Sundaravadivel

Durgalakshmi

Karthikeyan

et al. 2020

ACS Appl. Mater. Interfaces

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Herein, we have reported on the efficiency of inorganic Zn3N2 nanoparticles for labeling plant cells and animal cells toward imaging applications with negligible toxicity. We have synthesized zinc nitride (Zn3N2) colloidal nanoparticles with an average size of 25 nm at room temperature. The optical band gap of the prepared Zn3N2 nanoparticles is 2.8 eV and gives a visible range emission at 415 nm. With the addition of Zn3N2 colloids to organic dyes such as protoporphyrin, flavin adenine dinucleotide, fluorescein, and neutral red, the emission intensity of the organic dyes enhanced from 3 to 20 times. The molecular simulation and lifetime studies evidence the possibility of energy transfer from zinc nitride to organic dyes. The enhancement of dye intensity in the presence of Zn3N2 enhanced the vicinity of the cellular environment during confocal imaging of plant cells and animal cells. The detailed results suggested Zn3N2 for bioimaging and biosensor applications.

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Section: Resultsmentioning

confidence: 99%

Enhanced Emission of Zinc Nitride Colloidal Nanoparticles with Organic Dyes for Optical Sensors and Imaging Application

Sundaravadivel

Durgalakshmi

Karthikeyan

et al. 2020

ACS Appl. Mater. Interfaces

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“…It was firstly studied in a large-area graphene electrode ( Figure S4A ), under inert atmosphere, according to a electrochemical methodology described elsewhere ( Pauliukaite et al, 2007 ; Pauliukaite and Brett, 2008 ). PNR was chosen due to its ability to adsorb on gold nanoparticles-based bioconjugates with high affinity, useful for our next analytical studies ( Mazar et al, 2017 ; Prakash et al, 2018 ). Typical redox peaks are observed due to irreversible monomer oxidation at +0.86 V ( vs. Ag/AgCl sat ) and the redox pair interconversion neutral red – leuco -neutral red at −0.585 V ( vs. Ag/AgCl sat )( Pauliukaite et al, 2007 ).…”

Section: Resultsmentioning

confidence: 99%

“…Bioconjugate of RBD with AuNP was strategically adopted in order to ensure an efficient modification of EEVD’s G-PNR interface with RBD, as PNR and AuNP present a well-established adsorptive interaction( Mazar et al, 2017 ; Prakash et al, 2018 ). Therefore, AuNP based bioconjugates are expected to adsorb effectively on G-PNR EEVD interface.…”

Section: Methodsmentioning

confidence: 99%

Graphene-based hybrid electrical-electrochemical point-of-care device for serologic COVID-19 diagnosis

Mattioli

Castro

Macedo

et al. 2022

Biosensors and Bioelectronics

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The outbreak of COVID-19 pandemics highlighted the need of sensitive, selective, and easy-to-handle biosensing devices. In the contemporary scenario, point-of-care devices technologies for mass testing and infection mapping within a population has proven itself as of primordial importance. Here, we introduce a graphene-based Electrical-Electrochemical Vertical Device (EEVD) point-of-care biosensor, strategically engineered for serologic COVID-19 diagnosis. EEVD uses serologic IgG quantifications on SARS-CoV-2 Receptor Binding Domain (RBD) bioconjugate immobilized onto device surface. EEVD combines graphene basal plane with high charge carrier mobility, high conductivity, low intrinsic resistance, and interfacial sensitivity to capacitance alterations. EEVD application was carried out in real human serum samples. Since EEVD is a miniaturized device, it requires just 40 μL of sample for a point-of-care COVID-19 infections detection. When compared to serologic assays such ELISA and others immunochromatographic methods, EEVD presents some advantages such as time of analyses (15 min), sample preparation, and a LOD of 1.0 pg mL -1 . We glimpse that EEVD meets the principles of robustness and accuracy, desirable analytic parameters for assays destined to pandemics control strategies.

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“…12,13 Among the many nanosystems available, Au and Ag nanoparticles are popularly used because of their optical and electrochemical properties. 14,15 Likewise, Fe 3 O 4 nanoparticles are used in many practical applications as they posses electrochemical and magnetic properties. 16,17 The properties of nanoparticles can be advanced by coupling with biomolecules.…”

Section: Introductionmentioning

confidence: 99%

“…They also possess advantages like biocompatibility, 11 manufacturing of biosensors with increased sensitivity 12,13 . Among the many nanosystems available, Au and Ag nanoparticles are popularly used because of their optical and electrochemical properties 14,15 . Likewise, Fe 3 O 4 nanoparticles are used in many practical applications as they posses electrochemical and magnetic properties 16,17 .…”

Section: Introductionmentioning

confidence: 99%

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid

2021

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In recent times, Au nanoparticles have been commonly used for delivering the drug especially in the case of hypothermia of tumors, but low absorption of IR light does not solve destruction of tumor cells. However, nanoparticles such as Fe3O4 coated with Au could be used to deliver the drug to a specific spot due to applied external magnetic field. Due to these applications, boundary layer approximation is invoked to simplify the mathematical model. This paper presents the nanoparticle shape analysis and heat transfer features of the Au–Fe3O4–blood hybrid nanofluid flowing past a stretching surface on a magnetohydrodynamic medium. Numerical solutions of nonlinear differential equations are obtained by RKF‐45 method with the help of shooting technique. The behavior of emerging parameters is described graphically for velocity and temperature profiles. It is found that the blade‐shaped Au and Fe3O4 nanoparticles have better thermal conductance than brick, sphere, cylinder, needle, and platelet shapes. It is also observed that the Lorentz force generated due to magnetic field helps in controlling the flow and enhance the thermal conductivity of hybrid nanofluid.

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Variations in thermo-optical properties of neutral red dye with laser ablated gold nanoparticles

Cited by 16 publications

References 25 publications

Enhanced Emission of Zinc Nitride Colloidal Nanoparticles with Organic Dyes for Optical Sensors and Imaging Application

Enhanced Emission of Zinc Nitride Colloidal Nanoparticles with Organic Dyes for Optical Sensors and Imaging Application

Graphene-based hybrid electrical-electrochemical point-of-care device for serologic COVID-19 diagnosis

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid

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Variations in thermo-optical properties of neutral red dye with laser ablated gold nanoparticles

Cited by 16 publications

References 25 publications

Enhanced Emission of Zinc Nitride Colloidal Nanoparticles with Organic Dyes for Optical Sensors and Imaging Application

Enhanced Emission of Zinc Nitride Colloidal Nanoparticles with Organic Dyes for Optical Sensors and Imaging Application

Graphene-based hybrid electrical-electrochemical point-of-care device for serologic COVID-19 diagnosis

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe3O4 Casson hybrid nanofluid

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The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid