Localized collection of airborne biological hazards for environmental monitoring

Reiprich, Johannes; Gebinoga, Michael; Traue, Lutz-Philipp; Schlag, Leslie; Biswas, Shantonu; Kaltwasser, Mahsa; Honecker, Maria Christine; Stauden, Thomas; Pezoldt, Joerg; Schober, Andreas; Jacobs, Heiko O.

doi:10.1016/j.snb.2018.06.129

Cited by 3 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The corona generates electrons and negatively charged ions of the carrier gas nitrogen. A detailed description of the charging process and an analysis of the generated species were published before. , The negative charges drift toward the substrate, which, itself, acts as the grounded counter electrode. As substrates, silicon chips (1 cm × 1 cm) are used, which are partially masked with a 1 μm thick silicon dioxide (SiO 2 ) layer with circular openings.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Localized and Programmable Chemical Vapor Deposition Using an Electrically Charged and Guided Molecular Flux

et al. 2020

Self Cite

View full text Add to dashboard Cite

Chemical vapor deposition is a widely used material deposition technique. It commonly provides a uniform material flux to the substrate to cause uniform thin film growth. However, the ability to precisely adjust the local deposition rate would be highly preferable. This communication reports on a chemical vapor deposition method performed in a localized and programmable fashion by introducing an electrically charged and guided molecular flux. This allows for local adjustments of the deposition rate and three-dimensional shape by controlling the electric fields. Specifically, the precursor molecules are charged and then guided by arrays of electrodynamic funnels, which are created by a patterned dielectric layer, to predetermined deposition locations with a minimal spot size of 250 nm. Furthermore, nearest neighbor coupling is reported as a shaping method to cause the deposition of three-dimensional nanostructures. Additionally, the integration of individually addressable domain electrodes offers programmable charge dissipation to achieve an ON/OFF control. The described method is applicable to a wide variety of materials and precursors. Here, the localized and programmable deposition of three-dimensional copper oxide, chromium oxide, zinc oxide, and carbon nanowires is demonstrated.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Here, an alternative parallel deposition approach is introduced as a further development of the localized particle deposition. − The knowledge gained in the field of particles is now applied to precursor molecules. Specifically, an electrically charged and guided molecular flux is reported instead of charged nanoparticles.…”

mentioning

confidence: 99%

Localized and Programmable Chemical Vapor Deposition Using an Electrically Charged and Guided Molecular Flux

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Unlike these methods, a corona discharge assisted CVD process to tailor the growth morphology of Ga 2 O 3 and the physical properties for sensing applications has not yet been reported. The general idea and motivation behind this approach builds on recent research where we studied the effects of corona discharge in the presence of microscopic and nanoscopic particles and small molecules. − It was found that the particles can be directed toward biased surface electrodes at rates that exceeded diffusion-based transport by several orders of magnitude. , Moreover, due to the corona discharge, the carrier gas gets excited, yielding a plasma-assisted CVD process with a predominantly unipolar charging behavior. In previous experiments, the corona discharge had an influence on a classic vapor–liquid–solid (VLS) growth process.…”

mentioning

confidence: 99%

“…28−30 It was found that the particles can be directed toward biased surface electrodes at rates that exceeded diffusion-based transport by several orders of magnitude. 28,30 Moreover, due to the corona discharge, the carrier gas gets excited, yielding a plasma-assisted CVD process with a predominantly unipolar charging behavior. In previous experi-ments, the corona discharge had an influence on a classic vapor−liquid−solid (VLS) growth process.…”

mentioning

confidence: 99%

Corona Discharge Assisted Growth Morphology Switching of Tin-Doped Gallium Oxide for Optical Gas Sensing Applications

Reiprich

Isaac

Schlag

et al. 2019

Crystal Growth & Design

Self Cite

View full text Add to dashboard Cite

To match the properties of a semiconductor to a desired application, it is crucial to control its crystal structure. Here, we show that, by implementing a corona discharge in a chemical vapor deposition process, the growth morphology of gallium oxide can be adjusted to produce nanowires and layerlike and columnar crystal structures. The three morphologies can be explained by the transition from a classic chemical vapor process to a corona-assisted chemical vapor process with directed transport. Specifically, the excitation of the carrier gas by the corona discharge is exploited as a switch to transition from a vapor–liquid–solid nanowire growth mechanism to a layer by layer growth mechanism. The second switching parameter is the substrate bias which affects the directed precursor transport and enhances the growth rate. While the switching of the morphology has no effect on the crystal phase, the photoluminescence properties of the three morphologies are different. The grown structures are used as optical gas sensors at room temperature. Tin-doped gallium oxide is shown to be capable of detecting trace amounts (200 ppm) of alcohols such as acetone, ethanol, and isopropanol. The layerlike morphology provides the highest response.

show abstract

Nanoparticle gas phase electrodeposition: Fundamentals, fluid dynamics, and deposition kinetics

Schlag

Isaac

Nahrstedt

et al. 2021

Journal of Aerosol Science

View full text Add to dashboard Cite

Localized collection of airborne biological hazards for environmental monitoring

Cited by 3 publications

References 37 publications

Localized and Programmable Chemical Vapor Deposition Using an Electrically Charged and Guided Molecular Flux

Localized and Programmable Chemical Vapor Deposition Using an Electrically Charged and Guided Molecular Flux

Corona Discharge Assisted Growth Morphology Switching of Tin-Doped Gallium Oxide for Optical Gas Sensing Applications

Nanoparticle gas phase electrodeposition: Fundamentals, fluid dynamics, and deposition kinetics

Contact Info

Product

Resources

About