The quantum confined Stark effect in N-doped ZnO/ZnO/N-doped ZnO nanostructures for infrared and terahertz applications

Sikam, Pornsawan; Thirayatorn, R; Moontragoon, Pairot; Kaewmaraya, Thanayut; Amornkitbamrung, Vittaya; Ikonić, Z.

doi:10.1088/1361-6528/aba86f

Cited by 8 publications

(2 citation statements)

References 35 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the past decade, the rapid development of terahertz (THz) technology opened new routes to several important applications in the field of wireless communication, security, and nondestructive testing [1][2][3][4]. Thanks to the unique manipulation of electromagnetic waves in metamaterials (MTMs), the THz devices such as filters and signal absorbers gained a considerable attention by the researchers [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A vanadium dioxide-based metamaterial with quatrefoil and circle loaded structure on flexible polyamide substrate for terahertz applications

et al. 2022

View full text Add to dashboard Cite

In this study, a novel broadband metamaterial (MTM) absorber is proposed, which is based on vanadium dioxide (VO2) resonators coated onto a flexible polyamide substrate. The VO2 resonator is in the form of a quatrefoil and circle-loaded complementary square split ring resonator (CSSRR), which is fine tuned to operate in the terahertz range. The MTM design and simulation were carried out using Computer Simulation Technology (CST) software, by which different layouts were investigated to achieve the optimum structure. The results showed the presence of two pronounced peaks for the proposed MTM structure at 0.88 and 1.42 THz. The absorption peaks were found to be insensitive to the wave polarization and incident angle from 0° to 90°. The absorption mechanism of the MTM was investigated considering the insulating and metallic states of VO2. The results were in a good agreement with those calculated using high frequency simulated structure (HFSS) software. The flexible nature of the proposed MTM design makes it a viable candidate for non-planar and conformal geometry applications in stealth technology, and terahertz imaging.

show abstract

Section: Introductionmentioning

confidence: 99%

A vanadium dioxide-based metamaterial with quatrefoil and circle loaded structure on flexible polyamide substrate for terahertz applications

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Single atom catalysts (SACs) have furthered the field of catalysis due to the potential for carefully controlled active site properties and distinct capabilities compared to bulk and nanoparticle catalysts. The reduction in size of the metal modifies the behavior through several mechanisms including: quantum size effect, [1][2][3][4] strong metal-support interactions (SMSI), [5][6][7] surface effects, [8][9][10][11] and varied oxidation states. [12] As a result of these influences, the coordination environment of single atoms on supports control their reactivity.Visualizing SACs is important to understand the formation, coordination environment, and stability of the catalyst.…”

mentioning

confidence: 99%

Directly Probing the Local Coordination, Charge State, and Stability of Single Atom Catalysts by Advanced Electron Microscopy: A Review

Tieu

Yan

et al. 2021

Small

View full text Add to dashboard Cite

of a heterogeneous catalyst. Any atom not at the catalyst surface is not directly used to drive chemical conversions, which is a critical consideration for the use of precious metal catalysts. To that end, the use of smaller particles with high surface/ volume ratios has been the preferred choice to maximize metal utilization. Recent advancements in the synthesis of nanomaterials with targeted shapes and sizes have resulted in the production of catalysts with designed catalytic properties. Single atom catalysts (SACs) have furthered the field of catalysis due to the potential for carefully controlled active site properties and distinct capabilities compared to bulk and nanoparticle catalysts. The reduction in size of the metal modifies the behavior through several mechanisms including: quantum size effect, [1][2][3][4] strong metal-support interactions (SMSI), [5][6][7] surface effects, [8][9][10][11] and varied oxidation states. [12] As a result of these influences, the coordination environment of single atoms on supports control their reactivity.Visualizing SACs is important to understand the formation, coordination environment, and stability of the catalyst. Oftentimes, bulk and nanoparticle catalysts release atoms during a catalytic process, which may contribute to the measured catalytic activity and changes in activity as a function of time. Recent work visualizing the release of Au single atoms, from nanoporous Au surfaces during methane pyrolysis, demonstrates the importance of visualizing catalysts at the atomic scaleThe drive for atom efficient catalysts with carefully controlled properties has motivated the development of single atom catalysts (SACs), aided by a variety of synthetic methods, characterization techniques, and computational modeling. The distinct capabilities of SACs for oxidation, hydrogenation, and electrocatalytic reactions have led to the optimization of activity and selectivity through composition variation. However, characterization methods such as infrared and X-ray spectroscopy are incapable of direct observations at atomic scale. Advances in transmission electron microscopy (TEM) including aberration correction, monochromators, environmental TEM, and microelectro-mechanical system based in situ holders have improved catalysis study, allowing researchers to peer into regimes previously unavailable, observing critical structural and chemical information at atomic scale. This review presents recent development and applications of TEM techniques to garner information about the location, bonding characteristics, homogeneity, and stability of SACs. Aberration corrected TEM imaging routinely achieves sub-Ångstrom resolution to reveal the atomic structure of materials. TEM spectroscopy provides complementary information about local composition, chemical bonding, electronic properties, and atomic/molecular vibration with superior spatial resolution. In situ/operando TEM directly observe the evolution of SACs under reaction conditions. This review concludes with remarks on the challenges an...

show abstract

Low operating temperature N-ZnO/PANI chemiresistive acetone gas sensor

Baharuddin,

Ang,

Haseeb

et al. 2024

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

The quantum confined Stark effect in N-doped ZnO/ZnO/N-doped ZnO nanostructures for infrared and terahertz applications

Abstract: This is a repository copy of The quantum confined Stark effect in N-doped ZnO/ZnO/Ndoped ZnO nanostructures for infrared and terahertz applications.

Cited by 8 publications

References 35 publications

A vanadium dioxide-based metamaterial with quatrefoil and circle loaded structure on flexible polyamide substrate for terahertz applications

A vanadium dioxide-based metamaterial with quatrefoil and circle loaded structure on flexible polyamide substrate for terahertz applications

Directly Probing the Local Coordination, Charge State, and Stability of Single Atom Catalysts by Advanced Electron Microscopy: A Review

Low operating temperature N-ZnO/PANI chemiresistive acetone gas sensor

Contact Info

Product

Resources

About