The ability to tune the localised surface plasmon resonance (LSPR) behaviour of metal nanostructures has great importance for many optical sensor applications such as metal (plasmon) enhanced fluorescence spectroscopy and surface-enhanced Raman scattering (SERS). In this paper, we used Aerosol Direct Writing (ADW) to selectively deposit fine gold nanoparticles (AuNPs) patterns. A low-temperature thermal post-treatment (below 200 °C) provides enough...
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Lambda is a leading supplier of characterisation, measurement and analysis equipment, applied to signals from DC to Light. Our company provides hardware, software and integrated solutions throughout the UK & Ireland.
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White Paper: High step coverage interconnects by printed nanoparticles
The growing diversity in the used materials in semiconductor packaging provides challenges for achieving good interconnection. Particularly the very soft substrates, such as paper and polymers, and very hard, such as silicon carbide, offer unique challenges to wire-bonding or formation of vertical interconnects. Complementary technologies are therefore needed. Here, a method to direct-write metal tracks on the top and sides... -
White Paper: Boosting the thermoelectric properties of PEDOT:PSS via low-impact deposition of tin oxide nanoparticles
Poly(3,4-ethylenedioxy thiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibits valuable characteristics concerning stability, green-processing, flexibility, high electrical conductivity, and ease of property modulation, qualifying it as one of the most promising p-type organic conductors for thermoelectric (TE) applications. While blending with inorganic counterparts is considered a good strategy to further improve polymeric TE properties, only a few attempts succeed so far due to inhomogeneous embedding... -
White Paper: Dynamic restructuring of supported metal nanoparticles and its implications for structure insensitive catalysis
Some fundamental concepts of catalysis are not fully explained but are of paramount importance for the development of improved catalysts. An example is the concept of structure-insensitive reactions, where surface-normalized activity does not change with catalyst metal particle size. Here we explore this concept and its relation to surface reconstruction on a set of silica-supported Ni metal nanoparticles (mean particle... -
White Paper: Enhancement of room temperature Ethanol sensing by optimizing the density of vertically aligned carbon nanofibers decorated with gold nanoparticles
An ethanol gas sensor based on carbon nanofibers (CNFs) with various densities and nanoparticle functionalization was investigated. The CNFs were grown by means of a Plasma-Enhanced Chemical Vapor Deposition (PECVD), and the synthesis conditions were varied to obtain different number of fibers per unit area. The devices with a larger density of CNFs lead to higher responses, with a maximal... -
White Paper: Mass and density determination of porous nanoparticle films using a quartz crystal microbalance
A method is presented to directly measure the mass output of an impaction printer coupled with a spark ablation generator. It is based on a quartz crystal microbalance and shown to be reliable in quantifying mass deposition rate. Here, the method is demonstrated with an Au nanoparticle aerosol synthesized under several spark ablation and deposition settings. Changes in the deposition... -
White Paper: Aerosol based fabrication of Thiol-capped gold nanoparticles and their application for gene transfection
In this study, an ambient–spark–produced–Au– nanoparticle–laden nitrogen gas was mixed with an atomized solution of 1–hexanethiol and ethanol (EtOH). By increasing the thiol concentration from 0.1% to 1.0% (v/v), the size distribution of merged particles (Au–thiol) was changed from bimodal to unimodal configuration. The latter phenomenon is attributed to quantitative incorporation of Au nanoparticles into atomized particles. Measurements of cell... -
White Paper: Preparation of Ag nanoparticles by spark ablation in gas as catalysts for electrocatalytic hydrogen production
Spark ablation in gas (SAG) technology has the characteristics of being green, fast quenching, fast dynamics and specializes in producing metallic nanoparticles with a clean surface, small size, and abundant defects. In this study, Ag nanoparticles were prepared via SAG and in situ loaded on a carbon fibre through nitrogen flow. The effect of the carrier gas flow rate and... -
White Paper: Floquet prethermalization with lifetime exceeding 90s in a bulk hyperpolarized solid
Researchers have reported the observation of long-lived Floquet prethermal states in a bulk solid composed of dipolar-coupled 13C nuclei in diamond at room temperature. For precessing nuclear spins prepared in an initial transverse state, we demonstrate pulsed spin-lock Floquet control that prevents their decay over multiple-minute long periods. Researchers observed Floquet prethermal lifetimes 𝑇’2 ≈90.9s, extended >60,000-fold over the nuclear... -
Application Note: Stumbling across a good reason why you need a Check Standard
Video below shows some hints & tips - even a real-life problem solved by the Check Standard! It’s all well and good performing the calibration even if you are a seasoned user of VNA’s. But it is good practice to check your calibration afterwards. https://www.youtube.com/embed/dlMYyY37TCI To speak with one of our Sales & Applications Engineers please call 01582 764334 or click here to email. Lambda Photometrics...