English for Nanotechnology: Essential Vocabulary & Phrases

"nanoparticle"

A particle with at least one dimension between 1 and 100 nanometres that exhibits size-dependent properties.

"Gold nanoparticles are widely studied for their unique optical properties and biocompatibility in drug delivery systems."

"carbon nanotube"

A cylindrical nanostructure made of rolled graphene sheets with extraordinary mechanical and electrical properties.

"Carbon nanotubes were incorporated into the composite matrix to increase tensile strength by over 40 percent."

"quantum dot"

A semiconductor nanocrystal whose electronic properties are strongly size-dependent due to quantum confinement effects.

"Quantum dots tuned to emit at specific wavelengths are used as fluorescent markers in biological imaging."

"graphene"

A single atomic layer of carbon atoms arranged in a two-dimensional hexagonal lattice with exceptional electrical conductivity.

"The graphene coating dramatically reduced the electrical resistance of the flexible electrode."

"nanocomposite"

A material in which nanoscale filler particles are dispersed within a matrix to enhance its mechanical, thermal, or barrier properties.

"The polymer nanocomposite exhibited significantly improved flame retardancy due to the clay nanoplatelet reinforcement."

"surface-to-volume ratio"

The proportion of surface area to volume, which increases dramatically at the nanoscale and governs reactivity.

"The catalyst's high surface-to-volume ratio enabled faster reaction kinetics at lower temperatures."

"nanowire"

A one-dimensional nanostructure with a diameter typically below 100 nm and high aspect ratio, used in electronics and sensing.

"Silicon nanowires were grown vertically on the substrate to create a high-sensitivity biosensor array."

"self-assembly"

The spontaneous organization of molecules or nanocomponents into ordered structures without external direction.

"Block copolymer self-assembly was exploited to pattern features below 10 nm across the wafer."

"lithography"

A patterning technique that uses light, electrons, or ions to transfer a design onto a substrate for nanoscale device fabrication.

"Extreme ultraviolet lithography enabled the production of transistors with a gate length below 5 nm."

"chemical vapour deposition"

A process in which gaseous precursors react on a heated substrate surface to deposit thin solid films of controlled composition.

"Chemical vapour deposition was used to grow a uniform tungsten disulfide monolayer across a 4-inch wafer."

"atomic layer deposition"

A thin-film technique that deposits material one atomic layer at a time through sequential self-limiting surface reactions.

"Atomic layer deposition produced a conformal alumina barrier only 2 nm thick inside the high-aspect-ratio trenches."

"etching"

The controlled removal of material from a substrate using chemical or plasma processes to define nanoscale features.

"Reactive ion etching defined vertical sidewalls with sub-nanometre roughness in the silicon fin structure."

"top-down fabrication"

A manufacturing approach that begins with bulk material and progressively removes or patterns it to create nanoscale features.

"Top-down fabrication using electron-beam lithography produced reproducible quantum constrictions in the device array."

"bottom-up fabrication"

A manufacturing approach that builds structures atom by atom or molecule by molecule from smaller components.

"The team demonstrated bottom-up fabrication of a molecular motor assembled from just 78 atoms."

"dip-pen nanolithography"

A scanning-probe technique that uses an AFM tip as a pen to directly write chemical patterns with nanometre resolution.

"Dip-pen nanolithography deposited thiol inks onto gold surfaces to create protein-binding arrays for biosensing."

"nanoimprint lithography"

A patterning method that mechanically stamps a mould into a resist layer to replicate nanoscale features at low cost.

"Nanoimprint lithography achieved throughput 10 times higher than electron-beam lithography for the same feature resolution."

"atomic force microscopy"

A scanning-probe technique that measures surface topography and properties by sensing forces between a sharp tip and the sample surface.

"Atomic force microscopy revealed a root-mean-square surface roughness of only 0.3 nm after chemical mechanical polishing."

"transmission electron microscopy"

A high-resolution imaging technique in which a beam of electrons transmitted through a thin specimen forms an atomic-resolution image.

"Transmission electron microscopy confirmed the core-shell structure of the bimetallic nanoparticles at atomic resolution."

"X-ray diffraction"

A technique that uses the diffraction of X-rays by a crystalline sample to determine its atomic structure and phase composition.

"X-ray diffraction confirmed the phase-pure synthesis of the perovskite nanocrystals without detectable impurities."

"dynamic light scattering"

An optical technique that measures particle size distribution in suspension by analysing fluctuations in scattered laser light.

"Dynamic light scattering indicated a hydrodynamic diameter of 85 nm and a polydispersity index below 0.1."

"BET surface area"

The total accessible surface area per gram of a porous material, determined from gas adsorption measurements using Brunauer-Emmett-Teller theory.

"The mesoporous silica showed a BET surface area of 750 m² per gram, making it suitable for drug loading."

"scanning tunnelling microscopy"

A technique that images conductive surfaces at atomic resolution by measuring the quantum-mechanical tunnelling current between a sharp tip and the surface.

"Scanning tunnelling microscopy directly visualised the arrangement of individual iron atoms manipulated into a quantum corral."

"energy-dispersive X-ray spectroscopy"

An analytical technique coupled to an electron microscope that identifies elemental composition by measuring characteristic X-ray energies.

"Energy-dispersive X-ray spectroscopy mapping confirmed the homogeneous distribution of zinc throughout the nanoparticle interior."

"zeta potential"

The electrokinetic potential at the interface between a nanoparticle surface and the surrounding liquid, used to assess colloidal stability.

"A zeta potential more negative than −30 mV indicated that the nanoparticle suspension would remain stable for months."

"drug delivery system"

A nanotechnology-based carrier designed to transport therapeutic agents to a target tissue and release them in a controlled manner.

"The liposomal drug delivery system reduced off-target toxicity while maintaining the same anti-tumour efficacy."

"targeted drug delivery"

The use of nanocarriers functionalised with ligands to direct therapeutic payloads specifically to diseased cells or tissues.

"Targeted drug delivery via folate-receptor-conjugated nanoparticles increased intracellular drug concentration fivefold in cancer cells."

"liposome"

A spherical vesicle enclosed by a phospholipid bilayer that can encapsulate both hydrophilic and hydrophobic drugs for delivery.

"The pegylated liposome formulation extended the drug's circulation half-life from two hours to over 20 hours."

"biocompatibility"

The ability of a material to perform its intended function without eliciting an adverse host response or toxic reaction.

"Extensive cytotoxicity assays confirmed the biocompatibility of the iron oxide nanoparticles up to a concentration of 200 µg/mL."

"EPR effect"

The enhanced permeability and retention effect, by which nanoparticles preferentially accumulate in tumour tissue due to leaky vasculature.

"Nanoparticles sized around 100 nm exploited the EPR effect to achieve twelvefold higher tumour accumulation than free drug."

"theranostics"

An integrated approach combining diagnostic imaging and therapy within a single nanoscale platform.

"The theranostic nanoparticle enabled simultaneous MRI-guided imaging and photothermal ablation of the tumour."

"controlled release"

The engineered delivery of a drug from a carrier at a predetermined rate and duration in response to a stimulus or over time.

"The pH-responsive hydrogel achieved controlled release of the antibiotic only under the acidic conditions found in infected tissue."

"in vivo toxicology"

The study of the adverse biological effects of nanomaterials within living organisms, essential for regulatory approval.

"In vivo toxicology studies in rodent models showed no significant organ damage at the intended therapeutic dose range."

"transistor scaling"

The ongoing reduction in transistor dimensions according to Moore's Law to increase integration density and processing power.

"Transistor scaling below 3 nm requires entirely new device architectures such as gate-all-around nanosheets."

"quantum confinement"

The restriction of electron motion in one or more dimensions at the nanoscale, leading to discrete energy levels and size-dependent properties.

"Quantum confinement in the thin semiconductor well produced a blue-shifted emission peak compared to the bulk material."

"single-electron transistor"

A nanoscale device that controls the flow of individual electrons through a Coulomb blockade island, enabling ultra-low-power switching.

"The single-electron transistor operated at millikelvin temperatures and demonstrated charge sensitivity approaching the quantum limit."

"spintronics"

A field that exploits the intrinsic spin of electrons, as well as their charge, to store and process information in nanoscale devices.

"Spintronics-based magnetic tunnel junctions enabled hard drive read heads with sensitivity at the nanometre scale."

"two-dimensional material"

A crystalline material consisting of a single or few atomic layers with electronic properties distinct from its bulk counterpart.

"The transition metal dichalcogenide showed a direct bandgap as a two-dimensional material, making it attractive for LED applications."

"memristor"

A passive nanoscale circuit element whose resistance depends on the history of current flow, enabling non-volatile memory and neuromorphic computing.

"The memristor array performed vector-matrix multiplication in hardware, reducing inference energy by three orders of magnitude."

"tunnel junction"

A thin insulating barrier between two conductors through which electrons pass by quantum-mechanical tunnelling, used in sensors and qubits.

"Precise control of the tunnel junction thickness to within one atomic layer was critical for achieving uniform qubit frequencies."

"nanophotonic device"

An optical component that manipulates light at the nanoscale, exploiting phenomena such as plasmonics or photonic bandgaps.

"The nanophotonic device concentrated the optical field into a 10 nm gap, enabling single-molecule surface-enhanced Raman detection."

"photocatalysis"

The acceleration of a chemical reaction by a semiconductor nanomaterial that absorbs light and generates reactive species to drive the reaction.

"Visible-light-driven photocatalysis using titanium dioxide nanoparticles degraded over 90 percent of the dye within two hours."

"nanoporous membrane"

A thin film containing pores on the nanometre scale used for filtration, desalination, and selective separation of molecules.

"The graphene oxide nanoporous membrane achieved water permeance 100 times higher than conventional reverse osmosis filters."

"supercapacitor"

An energy storage device that uses nanoscale electrodes and electrolytes to store charge electrostatically, offering high power density and long cycle life.

"The reduced graphene oxide supercapacitor delivered a specific capacitance of 210 F/g and retained 95 percent capacity after 10,000 cycles."

"perovskite solar cell"

A photovoltaic device based on a perovskite-structured absorber layer that can be deposited as nanocrystalline thin films with high efficiency.

"The certified power conversion efficiency of the perovskite solar cell exceeded 26 percent in the latest record report."

"electrocatalyst"

A nanomaterial that increases the rate of an electrochemical reaction at an electrode surface, used in fuel cells and electrolysers.

"Platinum-iridium alloy nanoparticles served as a highly active electrocatalyst for the oxygen evolution reaction in the water electrolyser."

"adsorption capacity"

The amount of contaminant a nanomaterial can remove from solution by binding it to its surface, measured per unit mass.

"The iron oxide nanoparticles showed an adsorption capacity of 180 mg of arsenic per gram at pH 7."

"nanogenerator"

A device that converts mechanical or thermal energy into electricity using piezoelectric or triboelectric nanomaterials.

"The flexible piezoelectric nanogenerator harvested energy from finger bending and powered a wireless sensor continuously."

"nanofluid"

A base fluid in which nanomaterials are stably dispersed to enhance thermal conductivity and heat transfer performance.

"Adding 1 volume percent of copper nanoparticles to the coolant produced a nanofluid with 25 percent higher thermal conductivity."