Artem Grebenko

Artem Grebenko
National University of Singapore | NUS · Center for Advanced 2D Materials

Doctor of Philosophy

About

37
Publications
4,004
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220
Citations

Publications

Publications (37)
Article
Full-text available
Fabrication of nanostructured metasurfaces poses a significant technological and fundamental challenge. Despite developing novel material systems that support reversible elongation and distortion, their nanoscale patterning and control of optical properties remain an open problem. Herein we report the atomic force microscope lithography application...
Article
Full-text available
Following the game-changing high-pressure CO (HiPco) process that established the first facile route toward large-scale production of single-walled carbon nanotubes, CO synthesis of cm-sized graphene crystals of ultra-high purity grown during tens of minutes is proposed. The Boudouard reaction serves for the first time to produce individual monolay...
Article
Advances in material science, bioelectronic, and implantable medicine combined with recent requests for eco‐friendly materials and technologies inevitably formulate new challenges for nano‐ and micropatterning techniques. Overall, the importance of creating micro‐ and nanostructures is motivated by a large manifold of fundamental and applied proper...
Preprint
Full-text available
Fabrication of nanostructured metasurfaces poses a significant technological and fundamental challenge. Despite developing novel systems that support reversible elongation and distortion, their nanoscale patterning and control of optical properties remain an open problem. Herein we report the atomic force microscope lithography (AFML) application f...
Preprint
Advances in material science, bio-electronic, and implantable medicine combined with recent requests for eco-friendly materials and technologies inevitably formulate new challenges for nano- and micro-patterning techniques. Overall, the importance of creating micro and nanostructures is motivated by a large manifold of fundamental and applied prope...
Article
Full-text available
A variety of unconventional materials, including biological nanostructures, organic and hybrid semiconductors, as well as monolayer, and other low‐dimensional systems, are actively explored. They are usually incompatible with standard lithographic techniques that use harsh organic solvents and other detrimental processing. Here, a new class of gree...
Preprint
Nanometer thin single-walled carbon nanotube (CNT) films collected from the aerosol chemical deposition reactors have gathered attention for their promising applications. Densification of these pristine films provides an important way to manipulate the mechanical, electronic, and optical properties. To elucidate the underlying microstructural level...
Article
Full-text available
Novel bio-materials, like chitosan and its derivatives, appeal to finding a new niche in room temperature gas sensors, demonstrating not only a chemoresistive response, but also changes in mechanical impedance due to vapor adsorption. We determined the coefficients of elasticity and viscosity of chitosan acetate films in air, ammonia, and water vap...
Article
We study quasi-two-dimensional crystals of Co3O4 grown by electrochemical synthesis on Pt electrodes in nanoflake morphology to serve as a gas sensor. When synthesizing in aqueous electrolytes under applied electrical bias the material follows a self-hierarchical architecture to primarily appear as hexagonal nanoflakes, α-Co(OH)2. Following heating...
Article
We report a development of recently designed apparatus equipped with a spark discharge generator of catalytic nanoparticles for robust aerosol CVD synthesis of single-walled carbon nanotubes. We achieve a profound control over the diameter distribution and the defectiveness of carbon nanotubes produced. By providing a justified comparison of the ap...
Article
We developed a novel robust technique to produce high-quality dispersions of debundled SWCNTs in aqueous solutions. Direct injection of SWCNTs treated with supercritical nitrogen into the aqueous surfactant solution facilitates the dispersion process without the need of extensive ultrasonication. Ac- cording to photoluminescence and absorbance meas...
Article
Stable dispersions of single-walled carbon nanotubes (SWCNTs) demonstrated great prospects for applications in biomedical engineering, including bioelectronics, nanoparticle-based drug delivery and imaging in vivo. Prolonged stability of individual SWCNTs in suspensions is crucial for these applications. Here we report the method for efficient stab...
Article
We have designed and built an exhaust-free spark discharge generator for robust aerosol CVD synthesis of single-walled carbon nanotubes. The systematic study has shown the generator to provide a facile and repeatable route to precisely control the size of the catalyst particle and, therefore, carbon nanotube growth. Using a comprehensive set of met...
Article
Although carbon nanotubes have been already demonstrated to be a promising material for bolometric photodetectors, the sensitivity enhancement while maintaining the speed of operation remains a great challenge. Here, we present a holey carbon nanotube network, designed to improve the temperature coefficient of resistance for highly sensitive ultra-...
Article
Full-text available
Employing optical spectroscopy we have performed a comparative study of the dielectric response of extracellular matrix and filaments of electrogenic bacteria Shewanella oneidensis MR-1, cytochrome c, and bovine serum albumin. Combining infrared transmission measurements on thin layers with data of the terahertz spectra, we obtain the dielectric pe...
Article
Full-text available
Carbon nanotubes (CNT) attract considerable attention due to their unique physical properties and potential application in optoelectronics. Despite of intensive studies there is still a lack of agreement in experimental data on electrical properties of the material. Here we report on extremely broad-band conductivity and dielectric permittivity spe...
Article
Full-text available
An implementation of carbon nanotube films in optoelectronic devices is still a challenging task which requires further improvement of their both optical and electrical properties. Here, we report an approach to enhance the transmittance of single-walled carbon nanotube films placed onto polymeric substrates without losses in the film conductivity...
Article
Typical experimental measurement is set up as a study of the system’s response to a stationary external excitation. This approach considers any random fluctuation of the signal as spurious contribution which is to be eliminated via time-averaging or, equivalently, bandwidth reduction. Beyond that lies a conceptually different paradigm – the measure...
Preprint
Full-text available
Typical experimental measurement is set up as a study of the system's response to a stationary external excitation. This approach considers any random fluctuation of the signal as spurious contribution which is to be eliminated via time-averaging or, equivalently, bandwidth reduction. Beyond that lies a conceptually different paradigm -- the measur...
Article
Full-text available
For decades respiratory chain and photosystems were the main firing field of the studies devoted to mechanisms of electron transfer in proteins. The concept of conjugated lateral electron and transverse proton transport during cellular respiration and photosynthesis, which was formulated in the beginning of 1960-s, has been confirmed by thousands o...
Data
Scheme illustrating the change of water-metal surface with increasing humidity. At each particular RH level, there is a water layer lying between IBID Pt contacts above the bacterial nanofilament. Having reached a certain critical RH value, the thickness of the water layer overcomes 100–150 nm contact height and 300 nm of Au pads. At low humidity l...
Data
Tabulated Raman spectroscopy data. (PDF)
Data
Empty-circuit test structure DC I-V curves in dependence on RH. Comparing to Fig 3a no perceptible difference can be observed. (TIFF)
Article
Full-text available
The electrodynamics of metals is well understood within the Drude conductivity model; properties of insulators and semiconductors are governed by a gap in the electronic states. But there is a great variety of disordered materials that do not fall in these categories and still respond to external field in an amazingly uniform manner. At radiofreque...
Article
Electrical transport mechanisms of 2D carbon nanotube networks are presently under intensive studies. The related experimental data are ambiguous and controversial. We report on terahertz-infrared spectra of optical conductivity and dielectric permittivity of thin transparent films composed of pristine and CuCl- or iodine-doped single-walled carbon...
Article
Broad-band (4 to 20 000 cm<sup>-1</sup>) spectra of real and imaginary conductance of a set of high-quality pristine and AuCl<sub>3</sub>-dopped single-walled carbon nanotube (SWCNT) films with different transparency are systematically measured. It is shown that while the high-energy (≥1 eV) response is determined by well-known interband transition...
Conference Paper
Ac conductivity and dielectric permittivity of bovine serum albumin, cytochrome c and extracellular matrix synthesized by electrogenic bacteria Shewanella oneidensis MR-1 are measured at frequencies 1–10 12 Hz and temperatures 10–300 K. Two types of conductivity mechanisms are observed as well as nearly constant loss (NCL) phenomenon, universal die...
Article
Full-text available
An original method of one-step electrochemical deposition of electroactive composite films from a mixed solution of precursors of the organic and inorganic components in the mode of double cathodic–anodic pulses is used for the formation of Prussian blue/polypyrrole films on the surface of optically transparent electrodes. The deposition parameters...
Article
We demonstrate the procedure of scanning probe microscopy (SPM) conductive probe fabrication with a single multi-walled carbon nanotube (MWNT) on a silicon cantilever pyramid. The nanotube bundle reliably attached to the metal-covered pyramid is formed using dielectrophoresis technique from the MWNT suspension. It is shown that the dimpled aluminum...
Article
Full-text available
We demonstrate the procedure of Scanning Probe Microscopy (SPM) conductive probe fabrication with a single multi-walled carbon nanotube (MWNT) on a silicon cantilever pyramid. The nanotube bundle reliably attached to the metal-covered pyramid is formed using electrophoresis technique from the MWNT suspension. It is shown that the dimpled aluminium...

Questions

Questions (2)
Question
I'm working with chitosan films, and I am facing a problem with its degradation within a time. After few days chitosan films become less soluble in DI water. I wonder if chelating can help do the trick. 
Question
I have tried the following procdeure:
10 sec hexafluoroisopropanol (HFI)
dipping in DI water
back to HFI
It helped me to take off the spidroin film, however it was sufficiently damaged. Is there anyway to dettach it gently?

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