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Papers by Rajapandiyan Panneerselvam

Research paper thumbnail of Discernable machine learning methods for Raman micro‐spectroscopic stratification of mitoxantrone‐induced drug‐resistant cells in acute myeloid leukemia

Journal of Raman spectroscopy, May 17, 2024

Research paper thumbnail of Silver nanopopcorns decorated on flexible membrane for SERS detection of nitrofurazone

Mikrochimica acta, May 28, 2024

Research paper thumbnail of Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy (SHINERS) of Electrode Surfaces

Advances in electrochemical science and engineering, Mar 3, 2017

An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-ba... more An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-based leaching solution with shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) is discussed. Differences in passive layer growth during thiosulfate leaching were observed in the SHINERS spectra between the untreated and pressure oxidation (POX)-treated oxide ore samples received from Barrick Gold Corporation. The SHINERS spectra revealed that the passive layer at the untreated oxide ore-electrolyte interface contains metal sulfides and significant quantities of polysulfide chains ðS n =S 2À n Þ of variable lengths after longer exposure to the leaching solution. However, the passive layer observed with the POX-treated sample was found to be predominantly metal sulfides with only a small quantity of polysulfide chains. From these results, it was concluded that the POX pretreatment process may successfully destroy or inactivate minerals found in the ore that are responsible for catalysing thiosulfate decomposition into polysulfides which results in low gold extraction efficiencies.

Research paper thumbnail of Microwave-Assisted Synthesis of Highly Dispersed PtCu Nanoparticles on Three-Dimensional Nitrogen-Doped Graphene Networks with Remarkably Enhanced Methanol Electrooxidation

ACS Applied Materials & Interfaces, Nov 30, 2016

A well-dispersed PtCu alloy nanoparticles (NPs) on three-dimensional nitrogen-doped graphene (PtC... more A well-dispersed PtCu alloy nanoparticles (NPs) on three-dimensional nitrogen-doped graphene (PtCu/3D N-G) electrocatalyst has been successfully synthesized by a conventional hydrothermal method combined with a high-efficiency microwave-assisted polyol process. The morphology, composition, and structures are well-characterized by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy. Cyclic voltammograms illustrate that the as-prepared PtCu/3D N-G electrocatalyst possesses the larger electrochemical active surface area, lower onset potential, higher current density, and better tolerance to CO poisoning than PtCu NPs on reduced graphene oxide and XC-72 carbon black in acid solution. In addition, long-time chronoamperometry reveals that the PtCu/3D N-G catalyst exhibits excellent stability even longer than 60 min toward acid methanol electrooxidation. The remarkably enhanced performance is related to the combined effects of uniformly interconnected three-dimensional porous graphene networks, nitrogen doping, modified Pt alloy NPs, and strong binding force between Pt alloy NPs and 3D N-G structures.

Research paper thumbnail of Intelligent convolution neural network assisted SERS to realize highly accurate identification of six pathogenic Vibrio

Chemical Communications, 2023

Based on the label-free SERS technology, we successfully developed a deep learning CNN model, ach... more Based on the label-free SERS technology, we successfully developed a deep learning CNN model, achieving low-cost and high-accuracy identification of six representative pathogenic Vibrio within 15 minutes.

Research paper thumbnail of Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy

WORLD SCIENTIFIC (EUROPE) eBooks, Dec 6, 2017

Research paper thumbnail of Raman Spectroscopy for Hydrogen Production

American Chemical Society eBooks, Feb 15, 2023

Research paper thumbnail of Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy at Single-Crystal Electrode Surfaces

Advanced Optical Materials, Jul 21, 2016

An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-ba... more An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-based leaching solution with shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) is discussed. Differences in passive layer growth during thiosulfate leaching were observed in the SHINERS spectra between the untreated and pressure oxidation (POX)-treated oxide ore samples received from Barrick Gold Corporation. The SHINERS spectra revealed that the passive layer at the untreated oxide ore-electrolyte interface contains metal sulfides and significant quantities of polysulfide chains ðS n =S 2À n Þ of variable lengths after longer exposure to the leaching solution. However, the passive layer observed with the POX-treated sample was found to be predominantly metal sulfides with only a small quantity of polysulfide chains. From these results, it was concluded that the POX pretreatment process may successfully destroy or inactivate minerals found in the ore that are responsible for catalysing thiosulfate decomposition into polysulfides which results in low gold extraction efficiencies.

Research paper thumbnail of Erratum: Nanostructure-based plasmon-enhanced Raman spectroscopy for surface analysis of materials

Nature Reviews Materials, May 17, 2016

Research paper thumbnail of Shell-isolated nanoparticle-enhanced Raman spectroscopy study of the adsorption behaviour of DNA bases on Au(111) electrode surfaces

Analyst, 2016

Shell-isolated nanoparticle-enhanced Raman spectroscopy study of the adsorption behaviour of DNA ... more Shell-isolated nanoparticle-enhanced Raman spectroscopy study of the adsorption behaviour of DNA bases on Au(111) electrode surfaces †

Research paper thumbnail of Intelligent convolution neural network-assisted SERS to realize highly accurate identification of six pathogenic Vibrio

Chemical Communications

Based on the label-free SERS technology, we successfully developed a deep learning CNN model, ach... more Based on the label-free SERS technology, we successfully developed a deep learning CNN model, achieving low-cost and high-accuracy identification of six representative pathogenic Vibrio within 15 minutes.

Research paper thumbnail of Au nanocakes as a SERS sensor for on site and ultrafast detection of dioxins

Research paper thumbnail of Microwave-Assisted Synthesis of Highly Dispersed Carbon Supported Nickel Nanoparticles (Ni/C) With Renewable Carbon Source

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2013

ABSTRACT Carbon supported nickel nanoparticles, nickel/carbon (Ni/C) nanocomposite, have niche ap... more ABSTRACT Carbon supported nickel nanoparticles, nickel/carbon (Ni/C) nanocomposite, have niche applications in the area of catalysts, fuel cells, and electrodes. As a catalyst, nickel can be used in many catalysis reactions replacing the more expensive catalysts, palladium and platinum. Coating the nickel nanoparticles with carbon can stabilize the reactive nickel nanoparticles. Herein a new improved method of synthesizing highly dispersed nickel nanoparticles in a carbon matrix by utilizing a rapid heating from microwave irradiation is described. This method is an easy, fast, and economical route in synthesizing carbon coated nickel nanoparticles.

Research paper thumbnail of Surface-Enhanced Raman Spectroscopic Probing in Digital Microfluidics through a Microspray Hole

Analytical Chemistry, Dec 28, 2022

Research paper thumbnail of Transition Metal-Based Electrocatalysts: Applications in Green Hydrogen Production and Storage

Research paper thumbnail of Clinical detection of total homocysteine in human serum using surface-enhanced Raman spectroscopy

Research paper thumbnail of Removal of hemolysis interference in serum Raman spectroscopy by multivariate curve resolution analysis for accurate classification of oral cancers

Sensors & Diagnostics

Removing hemolysis components in serum by MCR-ALS assisted Raman spectroscopy. Disease specific i... more Removing hemolysis components in serum by MCR-ALS assisted Raman spectroscopy. Disease specific information in serum preserved after MCR-ALS analysis. Digital removal of undesirable components in Raman spectra improves oral cancer diagnosis.

Research paper thumbnail of Surface-enhanced Raman spectroscopy for food quality and safety monitoring

Research paper thumbnail of Promise of nano-carbon to the next generation sustainable agriculture

Research paper thumbnail of A rapid and simple chemical method for the preparation of Ag colloids for surface-enhanced Raman spectroscopy using the Ag mirror reaction

Vibrational Spectroscopy, 2018

Colloidal silver (Ag) nanoparticles (AgNP) have been widely used for surface-enhanced Raman spect... more Colloidal silver (Ag) nanoparticles (AgNP) have been widely used for surface-enhanced Raman spectroscopy (SERS) applications. We report a simple, rapid and effective method to prepare AgNP colloids for SERS using the classic organic chemistry Ag mirror reaction with Tollens' reagent. The AgNP colloid prepared with this process was characterized using SEM, and the reaction conditions further optimized using SERS measurements. It was found that Ag mirror reaction conditions that included 20 mM AgNO3, 5 min reaction time, and 0.5 M glucose produced AgNP colloids with an average size of 319.1 nm (s.d ±128.1). These AgNP colloids exhibited a significant SERS response when adenine was used as the reporter molecule. The usefulness of these new AgNP colloids was demonstrated by detecting the nucleotides adenosine 5′-monophosphate (AMP), guanosine 5′-monophosphate (GMP), cytidine 5′-monophosphate (CMP), and uridine 5′-monophosphate (UMP). A detection limit of 500 nM for AMP was achieved with the as-prepared AgNP colloid. The bacterium Mycoplasma pneumoniae was also easily detected in laboratory culture with these SERS substrates. These findings attest to the applicability of this AgNP colloid for the sensitive and specific detection of both small biomolecules and microorganisms.

Research paper thumbnail of Discernable machine learning methods for Raman micro‐spectroscopic stratification of mitoxantrone‐induced drug‐resistant cells in acute myeloid leukemia

Journal of Raman spectroscopy, May 17, 2024

Research paper thumbnail of Silver nanopopcorns decorated on flexible membrane for SERS detection of nitrofurazone

Mikrochimica acta, May 28, 2024

Research paper thumbnail of Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy (SHINERS) of Electrode Surfaces

Advances in electrochemical science and engineering, Mar 3, 2017

An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-ba... more An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-based leaching solution with shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) is discussed. Differences in passive layer growth during thiosulfate leaching were observed in the SHINERS spectra between the untreated and pressure oxidation (POX)-treated oxide ore samples received from Barrick Gold Corporation. The SHINERS spectra revealed that the passive layer at the untreated oxide ore-electrolyte interface contains metal sulfides and significant quantities of polysulfide chains ðS n =S 2À n Þ of variable lengths after longer exposure to the leaching solution. However, the passive layer observed with the POX-treated sample was found to be predominantly metal sulfides with only a small quantity of polysulfide chains. From these results, it was concluded that the POX pretreatment process may successfully destroy or inactivate minerals found in the ore that are responsible for catalysing thiosulfate decomposition into polysulfides which results in low gold extraction efficiencies.

Research paper thumbnail of Microwave-Assisted Synthesis of Highly Dispersed PtCu Nanoparticles on Three-Dimensional Nitrogen-Doped Graphene Networks with Remarkably Enhanced Methanol Electrooxidation

ACS Applied Materials & Interfaces, Nov 30, 2016

A well-dispersed PtCu alloy nanoparticles (NPs) on three-dimensional nitrogen-doped graphene (PtC... more A well-dispersed PtCu alloy nanoparticles (NPs) on three-dimensional nitrogen-doped graphene (PtCu/3D N-G) electrocatalyst has been successfully synthesized by a conventional hydrothermal method combined with a high-efficiency microwave-assisted polyol process. The morphology, composition, and structures are well-characterized by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy. Cyclic voltammograms illustrate that the as-prepared PtCu/3D N-G electrocatalyst possesses the larger electrochemical active surface area, lower onset potential, higher current density, and better tolerance to CO poisoning than PtCu NPs on reduced graphene oxide and XC-72 carbon black in acid solution. In addition, long-time chronoamperometry reveals that the PtCu/3D N-G catalyst exhibits excellent stability even longer than 60 min toward acid methanol electrooxidation. The remarkably enhanced performance is related to the combined effects of uniformly interconnected three-dimensional porous graphene networks, nitrogen doping, modified Pt alloy NPs, and strong binding force between Pt alloy NPs and 3D N-G structures.

Research paper thumbnail of Intelligent convolution neural network assisted SERS to realize highly accurate identification of six pathogenic Vibrio

Chemical Communications, 2023

Based on the label-free SERS technology, we successfully developed a deep learning CNN model, ach... more Based on the label-free SERS technology, we successfully developed a deep learning CNN model, achieving low-cost and high-accuracy identification of six representative pathogenic Vibrio within 15 minutes.

Research paper thumbnail of Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy

WORLD SCIENTIFIC (EUROPE) eBooks, Dec 6, 2017

Research paper thumbnail of Raman Spectroscopy for Hydrogen Production

American Chemical Society eBooks, Feb 15, 2023

Research paper thumbnail of Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy at Single-Crystal Electrode Surfaces

Advanced Optical Materials, Jul 21, 2016

An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-ba... more An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-based leaching solution with shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) is discussed. Differences in passive layer growth during thiosulfate leaching were observed in the SHINERS spectra between the untreated and pressure oxidation (POX)-treated oxide ore samples received from Barrick Gold Corporation. The SHINERS spectra revealed that the passive layer at the untreated oxide ore-electrolyte interface contains metal sulfides and significant quantities of polysulfide chains ðS n =S 2À n Þ of variable lengths after longer exposure to the leaching solution. However, the passive layer observed with the POX-treated sample was found to be predominantly metal sulfides with only a small quantity of polysulfide chains. From these results, it was concluded that the POX pretreatment process may successfully destroy or inactivate minerals found in the ore that are responsible for catalysing thiosulfate decomposition into polysulfides which results in low gold extraction efficiencies.

Research paper thumbnail of Erratum: Nanostructure-based plasmon-enhanced Raman spectroscopy for surface analysis of materials

Nature Reviews Materials, May 17, 2016

Research paper thumbnail of Shell-isolated nanoparticle-enhanced Raman spectroscopy study of the adsorption behaviour of DNA bases on Au(111) electrode surfaces

Analyst, 2016

Shell-isolated nanoparticle-enhanced Raman spectroscopy study of the adsorption behaviour of DNA ... more Shell-isolated nanoparticle-enhanced Raman spectroscopy study of the adsorption behaviour of DNA bases on Au(111) electrode surfaces †

Research paper thumbnail of Intelligent convolution neural network-assisted SERS to realize highly accurate identification of six pathogenic Vibrio

Chemical Communications

Based on the label-free SERS technology, we successfully developed a deep learning CNN model, ach... more Based on the label-free SERS technology, we successfully developed a deep learning CNN model, achieving low-cost and high-accuracy identification of six representative pathogenic Vibrio within 15 minutes.

Research paper thumbnail of Au nanocakes as a SERS sensor for on site and ultrafast detection of dioxins

Research paper thumbnail of Microwave-Assisted Synthesis of Highly Dispersed Carbon Supported Nickel Nanoparticles (Ni/C) With Renewable Carbon Source

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2013

ABSTRACT Carbon supported nickel nanoparticles, nickel/carbon (Ni/C) nanocomposite, have niche ap... more ABSTRACT Carbon supported nickel nanoparticles, nickel/carbon (Ni/C) nanocomposite, have niche applications in the area of catalysts, fuel cells, and electrodes. As a catalyst, nickel can be used in many catalysis reactions replacing the more expensive catalysts, palladium and platinum. Coating the nickel nanoparticles with carbon can stabilize the reactive nickel nanoparticles. Herein a new improved method of synthesizing highly dispersed nickel nanoparticles in a carbon matrix by utilizing a rapid heating from microwave irradiation is described. This method is an easy, fast, and economical route in synthesizing carbon coated nickel nanoparticles.

Research paper thumbnail of Surface-Enhanced Raman Spectroscopic Probing in Digital Microfluidics through a Microspray Hole

Analytical Chemistry, Dec 28, 2022

Research paper thumbnail of Transition Metal-Based Electrocatalysts: Applications in Green Hydrogen Production and Storage

Research paper thumbnail of Clinical detection of total homocysteine in human serum using surface-enhanced Raman spectroscopy

Research paper thumbnail of Removal of hemolysis interference in serum Raman spectroscopy by multivariate curve resolution analysis for accurate classification of oral cancers

Sensors & Diagnostics

Removing hemolysis components in serum by MCR-ALS assisted Raman spectroscopy. Disease specific i... more Removing hemolysis components in serum by MCR-ALS assisted Raman spectroscopy. Disease specific information in serum preserved after MCR-ALS analysis. Digital removal of undesirable components in Raman spectra improves oral cancer diagnosis.

Research paper thumbnail of Surface-enhanced Raman spectroscopy for food quality and safety monitoring

Research paper thumbnail of Promise of nano-carbon to the next generation sustainable agriculture

Research paper thumbnail of A rapid and simple chemical method for the preparation of Ag colloids for surface-enhanced Raman spectroscopy using the Ag mirror reaction

Vibrational Spectroscopy, 2018

Colloidal silver (Ag) nanoparticles (AgNP) have been widely used for surface-enhanced Raman spect... more Colloidal silver (Ag) nanoparticles (AgNP) have been widely used for surface-enhanced Raman spectroscopy (SERS) applications. We report a simple, rapid and effective method to prepare AgNP colloids for SERS using the classic organic chemistry Ag mirror reaction with Tollens' reagent. The AgNP colloid prepared with this process was characterized using SEM, and the reaction conditions further optimized using SERS measurements. It was found that Ag mirror reaction conditions that included 20 mM AgNO3, 5 min reaction time, and 0.5 M glucose produced AgNP colloids with an average size of 319.1 nm (s.d ±128.1). These AgNP colloids exhibited a significant SERS response when adenine was used as the reporter molecule. The usefulness of these new AgNP colloids was demonstrated by detecting the nucleotides adenosine 5′-monophosphate (AMP), guanosine 5′-monophosphate (GMP), cytidine 5′-monophosphate (CMP), and uridine 5′-monophosphate (UMP). A detection limit of 500 nM for AMP was achieved with the as-prepared AgNP colloid. The bacterium Mycoplasma pneumoniae was also easily detected in laboratory culture with these SERS substrates. These findings attest to the applicability of this AgNP colloid for the sensitive and specific detection of both small biomolecules and microorganisms.