0000000000025427

AUTHOR

Rositsa Yakimova

showing 3 related works from this author

Seed‐Layer‐Free Atomic Layer Deposition of Highly Uniform Al 2 O 3 Thin Films onto Monolayer Epitaxial Graphene on Silicon Carbide

2019

Atomic layer deposition (ALD) is the method of choice to obtain uniform insulating films on graphene for device applications. Owing to the lack of out-of-plane bonds in the sp(2) lattice of graphene, nucleation of ALD layers is typically promoted by functionalization treatments or predeposition of a seed layer, which, in turn, can adversely affect graphene electrical properties. Hence, ALD of dielectrics on graphene without prefunctionalization and seed layers would be highly desirable. In this work, uniform Al2O3 films are obtained by seed-layer-free thermal ALD at 250 degrees C on highly homogeneous monolayer (1L) epitaxial graphene (EG) (amp;gt;98% 1L coverage) grown on on-axis 4H-SiC(00…

SiCMaterials sciencePhysics::Opticslaw.inventionchemistry.chemical_compoundAtomic layer depositionlawLattice (order)MonolayerPhysics::Atomic and Molecular ClustersSilicon carbidePhysics::Chemical PhysicsThin filmCondensed Matter::Quantum Gasesatomic force microscopybusiness.industryAtomic force microscopyGrapheneMechanical EngineeringCondensed Matter Physicsepitaxial graphenechemistryMechanics of Materialsatomic layer depositionOptoelectronicsatomic force microscopy; atomic layer deposition; epitaxial graphene; SiCEpitaxial graphenebusinessDen kondenserade materiens fysikAdvanced Materials Interfaces
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Application of 2D Non-Graphene Materials and 2D Oxide Nanostructures for Biosensing Technology

2016

The discovery of graphene and its unique properties has inspired researchers to try to invent other two-dimensional (2D) materials. After considerable research effort, a distinct "beyond graphene" domain has been established, comprising the library of non-graphene 2D materials. It is significant that some 2D non-graphene materials possess solid advantages over their predecessor, such as having a direct band gap, and therefore are highly promising for a number of applications. These applications are not limited to nano- and opto-electronics, but have a strong potential in biosensing technologies, as one example. However, since most of the 2D non-graphene materials have been newly discovered,…

NanostructureDopamineOxidetransition metal dichalcogenides; transducers; beyond graphene; biosensors; two-dimensional materials; two-dimensional oxides; transition metal oxidesNanotechnologyReviewBiosensing Techniques02 engineering and technology010402 general chemistrylcsh:Chemical technology01 natural sciencesBiochemistryAnalytical Chemistrylaw.inventionchemistry.chemical_compoundlawtransducerslcsh:TP1-1185transition metal oxidesElectrical and Electronic Engineeringtwo-dimensional materialsInstrumentationMaterial synthesisChemistryGraphenetransition metal dichalcogenidesOxidesDNAKemi021001 nanoscience & nanotechnologyAscorbic acidbiosensorsAtomic and Molecular Physics and OpticsNanostructures0104 chemical sciencestwo-dimensional oxidesbeyond grapheneGlucoseChemical SciencesGraphiteDirect and indirect band gaps0210 nano-technologyBiosensor
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Toward development of optical biosensors based on photoluminescence of TiO2 nanoparticles for the detection of Salmonella

2017

Quality control of food and agriculture production is an inseparable part of human safety and wellbeing. Salmonella infections belong to one of the most monitored pathogens in the world, therefore advanced determination of this pathogen can decrease the risks of human diseases caused by this microorganism. In this research we introduce a novel optical immunosensor for determination of Salmonella typhimurium. The immunosensor is based on Titanium dioxide (TiO2) nanoparticles deposited on glass substrates (glass/TiO2)center dot TiO2 nanoparticles exhibit an intense photoluminescence (PL) in the visible range of spectrum at room temperature. The direct immobilization of antibodies (anti-S-Ab) …

TiO2 nanoparticles; Photoluminescence based biosensor; Immunosensor; Salmonella infection; AntibodySalmonellaPhotoluminescenceMaterials scienceNanoparticleNanotechnology02 engineering and technology010402 general chemistrymedicine.disease_cause01 natural sciencesAnalytical Chemistrychemistry.chemical_compoundAnalytisk kemiMaterials ChemistrymedicineHuman safetyElectrical and Electronic EngineeringInstrumentationTio2 nanoparticlesMetals and Alloys021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryTitanium dioxideVisible range0210 nano-technologyBiosensorSensors and Actuators B: Chemical
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