Bulletin of the American Physical Society
75th Annual Gaseous Electronics Conference
Volume 67, Number 9
Monday–Friday, October 3–7, 2022;
Sendai International Center, Sendai, Japan
The session times in this program are intended for Japan Standard Time zone in Tokyo, Japan (GMT+9)
Session DT3: Plasmas and Nanotechnology II |
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Chair: Tsuyohito Ito, The University of Tokyo Room: Sendai International Center Tachibana |
Tuesday, October 4, 2022 1:30PM - 2:00PM |
DT3.00001: Nanoplasmonic sensors designed by plasmas Invited Speaker: Uros Cvelbar Today, there are several well-established research directions where plasmonic detection is employed extensively; namely, food and water quality monitoring, viruses, pathogenic bacteria and hazardous toxin investigations for theranostic applications, and other purposes. A combination of vibrational spectroscopy and surface nanoengineering has gained a reputation as a powerful tool for rapid and accurate determination of submolecular quantities of nanoanalytes. Signal enhancement achieved by employing various metallic nanoparticles and nanostructures can be amplified significantly due to the electromagnetic field confinement effect. Localized surface plasmon waves, which are responsible for the phenomenon, promote light absorption at nanovolume, generating ‘hot spots’ with an incredibly intense and confined electromagnetic field close to the nanosculptured metallic surface. However, the formation of the hot spot network is heavily dependent on morphology, size, and spatial arrangement of plasmonic nanomaterials. Under optimal excitation conditions, the interaction between the optically induced electromagnetic field in the hot spot region and a probing analyte attached to the nanosculptured metallic substrate enlarges photon scattering cross-section, increasing signal intensity by 106–1010. As a result, fast single-molecule vibrational fingerprint recording is possible. Here plasma fabrication of such nanoplasmonic surfaces was used due to its versatility compared to other nanofabrication techniques, its reliability, single-step and fast processing. This presentation highlights our recent research in the design of nanoplasmonic surfaces with plasmas, highlighted by supreme performances from the detection of toxic molecules down to DNA sampling. |
Tuesday, October 4, 2022 2:00PM - 2:15PM |
DT3.00002: Preparation of surfactant-free gold nano-particle dispersed aqueous solutions with solution plasma processing for surface-enhanced Raman scattering spectroscopy Naoki Matsuda Detailed procedure to form gold (Au) thin films from surfactant-free Au nano-particle dispersed aqueous solution prepared by solution plasma processing was investigated for the application of surface-enhanced Raman scattering (SERS) spectroscopy measurement. The averaged diameter, thickness, and the weight of each Au thin film in our experimental conditions from 40 mL of around 0.1 % Au dispersed aqueous solution, were evaluated to be around 2.4 mm, 3 μm and 0.1 mg, respectively. SERS spectra of dye molecules and thiol compounds adsorbed on Au thin film were successfully measured upon excitation at 532 nm of solid type laser and 632.8 nm of He-Ne laser, respectively. These SERS spectra from AuNP film surface were unexpectedly strong as compared to those from Ag surface. The possible application of AuNP thin film for SERS platform on solid/liquid interfaces was demonstrated by observation of SERS spectra from p-nitrothiophenol (PNTP) adsorbed on Au thin film/aqueous solution interface. |
Tuesday, October 4, 2022 2:15PM - 2:45PM |
DT3.00003: Plasma synthesis and processing of nanostructured quantum materials Invited Speaker: Renato P Camata Low-temperature plasmas (LTPs) have long been recognized as effective in enhancing physical and chemical processes during materials synthesis. The emergence of quantum materials has renewed the interest in processing using LTPs, with the goal of engineering systems that exhibit quantum coherence, electronic wave function topology, quantum entanglement, and quantum fluctuation effects. There are vast opportunities for control, enhancement, and discovery of new phenomena when these materials are synthesized as thin films and heterostructures. A now-classic example is the interface-enhanced superconductivity of monolayer β-FeSe on (001)-oriented SrTiO3. LTPs generated by laser ablation are of particular interest in this regard because of their rich chemistry and spatiotemporal phenomena. These plasmas can produce reactivity, temperature, and stress profiles to induce chemo-thermo-mechanical materials transformations at interfaces that are not accessible by other approaches. The kinetic energy of ions can be readily tuned in the ~1-100 eV range and ion densities controlled between 109 and 1015 cm-3. Compressive stress (kPa to tens of GPa) and temperature pulses (hundreds to thousands of kelvin) can be delivered by the leading edge of the plasma expansion. The sequence and timing of these conditions are adjustable, allowing new types of nonequilibrium processing. In this talk, I will review the state of plasma synthesis and processing of quantum materials, such as graphene, transition metal dichalcogenides, and atomic-monolayer epitaxial quantum materials. I will show how Langmuir probe, optical emission spectroscopy, and gated-intensified CCD imaging diagnostics can be used in conjunction with plasma fluid simulations to probe the plasma flow dynamics, distinguish the various components, and control the plasma parameters of the multi-species laser-generated plasma used for growth of FeSe/SrTiO3 quantum heterointerfaces. |
Tuesday, October 4, 2022 2:45PM - 3:00PM |
DT3.00004: Size-control of Gold Nanoparticles Synthesized by Plasma in Contact with Liquids via Using Ligands Phuoc V Thai Plasma in contact with liquids (PCL) owns the ability to synthesize gold nanoparticles (AuNPs) with surfaces free of any ligands. This feature has been attractive for high-standard applications, for which AuNPs undergo many steps of functionalization. However, the size-control of AuNPs synthesized by PCL has still been challenging. This study presents a simple approach to precisely controlling the size of AuNPs synthesized via PCL. By adding the suitable ligands into the precursor, the growth in large size of AuNPs can be controlled, and the final size of AuNPs was fixed to a reciprocal function of the concentration of added ligand. |
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