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Alexander Porkovich

Alexander Porkovich
Archer Materials

BSc (hons.) in Nanotechnology, PhD

About

20
Publications
2,170
Reads
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200
Citations
Introduction
My area of research interest lies in surface physics and chemistry. Specifically I am interested in the fabrication and characterisation of nanostructures and nanoparticles, in addition to exploiting their unique properties for applied purposes. This has included investigating applications in sensors, plasmonics and catalysis. I am also interested in exploring applications in energy in the future.
Additional affiliations
August 2016 - July 2020
Okinawa Institute of Science and Technology
Position
  • PostDoc Position
Description
  • Was responsible for the synthesis and deposition of nanoparticles using magnetron assisted gas aggregation. Also characterized samples using SEM, XPS and TEM (low mag), and analysed the results. Worked with inorganic noble metals and transition metal oxides. Assisted in the preparation of manuscripts by contributing a report to be incorporated, assisting in post draft edits and preparation of full drafts.
Education
April 2008 - June 2013
University of Technology, Sydney
Field of study
  • Materials Science, Physics, Sensor Technology
March 2007 - October 2007
University of Technology Sydney
Field of study
  • Biomolecule Characterisation
March 2004 - October 2006
University of Technology Sydney
Field of study
  • Nanotechnology

Publications

Publications (20)
Article
Full-text available
Nanomaterials undergoing cyclic swelling-deswelling benefit from inner void spaces that help accommodate significant volumetric changes. Such flexibility, however, typically comes at a price of reduced mechanical stability, which leads to component deterioration and, eventually, failure. Here, we identify an optimised building block for silicon-bas...
Article
Interactions between oxide supports and noble metal nanoparticles (NPs) is an area of intense research interest across all fields of catalysis. Oxygen spillover, metal support interactions (MSIs) and charge transfer, are among many mechanisms observed and proposed as to how NP-support interfaces assist and enhance catalysis. This work studies the m...
Article
Electronic metal-support interactions (EMSI) are an area of intense study, the manipulation of which is of paramount importance in the improvement of heterogenous metal nanoparticle (NP) supported catalysts. EMSI is the transfer of charge from the support to the NP, enabling more effective adsorption and interaction of reactants during catalysis. R...
Article
Full-text available
Tuning the metal support interaction (MSI) in heterogeneous catalysts is of utmost importance for various applications different catalysis reactions. Pt-TiN systems are strong contenders for commercial catalysts, although the charge screening of Pt and non-involvement of N reduces their effective MSI and limits it to the Pt-Ti interface. Here the b...
Article
Electronic Metal-Support Interactions (EMSIs) in metallic nanoparticle (NP) supported catalysts are responsible for these nanomaterials’ high-performance electronic and catalytic properties. However, the investigation of EMSIs at nanoscale under different environments has not been well studied. In this work, gas-phase synthesized Pt NPs and thermal...
Article
Field-effect transistor (FET) biosensors based on low-dimensional materials are capable of highly sensitive and specific label-free detection of various analytes. In this work, a FET biosensor based on graphene decorated with gold nanoparticles (Au NPs) was fabricated for lactose detection in a liquid-gate measurement configuration. This graphene d...
Article
Full-text available
Research has focused on graphene for developing the next generation of label-free biosensors, capable of highly sensitive and specific detection of DNA or other biomolecules. The binding of charged analytes to the one-atom thick layer of graphene can greatly affect its electronic properties. However, graphene is highly chemically inert, thus surfac...
Chapter
This chapter examines examples of the decoration of nanostructured semiconductive materials with nanoclusters, highlighting what cluster beam deposition can add to the field. The chapter starts by explaining the basic concepts of semiconductor-based sensors (particularly metal oxide semiconductors (MOS)), before describing some general geometries a...
Article
Full-text available
Metal oxide semiconductor nanowires have important applications in label-free biosensing due to their ease of fabrication and ultralow detection limits. Typically, chemical functionalization of the oxide surface is necessary for specific biological analyte detection. We instead demonstrate the use of gas-phase synthesis of gold nanoparticles (Au NP...
Article
Comprehensive understanding of the electrochemical activity of single nanoparticles (NPs) is in critical need for opening new avenues in the broad field of electrochemistry. Published reports on single-NP electrocatalysts typically include complicated and difficult methods of synthesis and characterization; moreover, these methods usually fail to p...
Article
Full-text available
Surface charge and charge transfer between nanoclusters and oxide supports are of paramount importance to catalysis, surface plasmonics, and optical energy harvesting areas. At present, high-energy X-rays and theoretical investigation are always required to determine the chemical state changes in the nanoclusters and the oxide supports, as well as...
Article
Full-text available
To this day, engineering nanoalloys beyond bimetallic compositions has scarcely been within the scope of physical deposition methods due to the complex, non-equilibrium processes they entail. Here, we report a gas-phase synthesis strategy for the growth of multi-metallic nanoparticles: magnetron-sputtering inert-gas condensation from neighboring mo...
Article
Nanoscale sponges formed by de-alloying suitable metallic alloys have a wide variety of potential applications due to their enhanced catalytic, optical and electrochemical properties. In general these materials have a bi-continuous, vermicular morphology of pores and ligaments with a fibrous appearance, however other morphologies are sometimes repo...
Article
Mist streams comprised of ${\rm H}_{2}{\rm O}_{2}/{\rm H}_{2}{\rm O}$ droplets are a recent innovation for disinfecting medical equipment, but the availability of a sensor that could monitor the concentration of ${\rm H}_{2}{\rm O}_{2}$ applied during the treatment would be desirable. Here we describe a means to obtain a rapid estimation of ${\rm H...
Article
A sensor for characterising aqueous solutions of hydrogen peroxide is described. The sensor is based on the calorimetric signal obtained when catalysing the decomposition of H2O2. The system is quick and simple, and is suitable for determinations of H2O2 concentration between 0% and at least 50% (w/w).
Article
Full-text available
The ability to visualise proteins in their native environment and discern information regarding stoichiometry is of criti-cal importance when studying protein interactions and function. We have used liquid cell atomic force microscopy (AFM) to visualise proteins in their native state in buffer and have determined their molecular volumes. The human...
Article
The localised surface plasmon resonance in gold nanoparticles can be used as the basis of a refractometric sensor. Usually, this is accomplished by monitoring a shift in wavelength of the resonance peak, a task which requires measurements over a range of wavelengths. Here we investigate a different scheme, in which interrogation of the sensor is ca...

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Projects

Projects (2)
Project
Gas-phase synthesis of bimetallic/trimetallic nanoparticles