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Appl. Nano, Volume 5, Issue 1 (March 2024) – 3 articles

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13 pages, 9860 KiB  
Article
Nano Application of Oil Concentration Detection Using Double-Tooth Ring Plasma Sensing
by Lei Li, Shubin Yan, Yang Cui, Chuanhui Zhu, Taiquan Wu, Qizhi Zhang and Guowang Gao
Appl. Nano 2024, 5(1), 20-32; https://doi.org/10.3390/applnano5010003 - 23 Feb 2024
Viewed by 682
Abstract
Based on the unique properties of optical Fano resonance and plasmonic-waveguide coupling systems, this paper explores a novel refractive index concentration sensor structure. The sensor structure is composed of a metal–insulator–metal (MIM) waveguide and two identically shaped and sized double-tooth ring couplers (DTR). [...] Read more.
Based on the unique properties of optical Fano resonance and plasmonic-waveguide coupling systems, this paper explores a novel refractive index concentration sensor structure. The sensor structure is composed of a metal–insulator–metal (MIM) waveguide and two identically shaped and sized double-tooth ring couplers (DTR). The performance structure of the nanoscale refractive index sensor with DTR cavity was comprehensively assessed using the finite element method (FEM). Due to the impact of various geometric parameters on the sensing characteristics, including the rotation angles, the widths between the double-tooth rings, and the gaps between the cavity and the waveguide, we identified an optimal novel refractive index sensor structure that boasts the best performance indices. Finally, the DTR cavity sensor achieved a sensitivity of 4137 nm/RIU and Figure of merit (FOM) of 59.1. Given the high complexity and sensitivity of the overall structure, this nanoscale refractive index sensor can be applied to the detection of oil concentration in industrial oil–water mixtures, yielding highly precise results. Full article
(This article belongs to the Collection Feature Papers for Applied Nano)
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6 pages, 630 KiB  
Editorial
Nanoscale Solutions: The Transformative Applications of Functionalized Nanomaterials in Environmental Remediation
by Sara Cerra and Ilaria Fratoddi
Appl. Nano 2024, 5(1), 14-19; https://doi.org/10.3390/applnano5010002 - 31 Jan 2024
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Abstract
Environmental pollution has become a pervasive and pressing issue in the modern world, mainly arising from human activities that release harmful substances into the air, water, and soil [...] Full article
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14 pages, 3750 KiB  
Article
Concurrent Thermal Reduction and Boron-Doped Graphene Oxide by Metal–Organic Chemical Vapor Deposition for Ultraviolet Sensing Application
by Beo Deul Ryu, Hyeon-Sik Jang, Kang Bok Ko, Min Han, Tran Viet Cuong, Chel-Jong Choi and Chang-Hee Hong
Appl. Nano 2024, 5(1), 1-13; https://doi.org/10.3390/applnano5010001 - 28 Dec 2023
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Abstract
We synthesized a boron-doped reduced graphene oxide (BrGO) material characterized by various electrical properties, through simultaneous thermal reduction and doping procedures, using a metal–organic chemical vapor deposition technique. X-ray photoelectron spectroscopy (XPS) was used to study the impact of the doping level on [...] Read more.
We synthesized a boron-doped reduced graphene oxide (BrGO) material characterized by various electrical properties, through simultaneous thermal reduction and doping procedures, using a metal–organic chemical vapor deposition technique. X-ray photoelectron spectroscopy (XPS) was used to study the impact of the doping level on the B bonding in the reduced graphene oxide (rGO) layer that is influenced by the annealing temperature. The synthesized BrGO layer demonstrated a high B concentration with a considerable number of O-B bonds, that were altered by annealing temperatures. This resulted in a decreased work function and the formation of a Schottky contact between the BrGO and n-type Si substrate. Due to the higher proportion of B-C and B-C3 bonding in the BrGO/Si device than that in the rGO/Si, the decreased Schottky barrier height of the BrGO/n-Si vertical junction photodetector resulted in a higher responsivity. This study showcases a promise of a simple B-doping method in use to alter the electrical characteristics of graphene materials. Full article
(This article belongs to the Collection Feature Papers for Applied Nano)
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