scholarly journals Charge state switching of Cu acceptors in ZnO nanorods

2017 ◽  
Vol 110 (12) ◽  
pp. 121907 ◽  
Author(s):  
M. Azizar Rahman ◽  
Mika T. Westerhausen ◽  
Christian Nenstiel ◽  
Sumin Choi ◽  
Axel Hoffmann ◽  
...  
Keyword(s):  
Charge State ◽  
Zno Nanorods ◽  
State Switching

scholarly journals Charge state switching of the divacancy defect in 4H -SiC

2018 ◽  
Vol 98 (21) ◽  
Author(s):  
Ariana Beste ◽  
DeCarlos E. Taylor ◽  
D. Andrew Golter ◽  
Chih W. Lai
Keyword(s):  
Charge State ◽  
State Switching

scholarly journals Active and fast charge-state switching of single NV centres in diamond by in-plane Al-Schottky junctions

2016 ◽  
Vol 7 ◽  
pp. 1727-1735 ◽  
Author(s):  
Christoph Schreyvogel ◽  
Vladimir Polyakov ◽  
Sina Burk ◽  
Helmut Fedder ◽  
Andrej Denisenko ◽  
...  
Keyword(s):  
Quantum Information ◽  
Charge State ◽  
Single Photon ◽  
Schottky Contact ◽  
Nitrogen Vacancy ◽  
Diode Structure ◽  
Diamond Surface ◽  
Switching Frequency ◽  
Near Surface ◽  
State Switching

In this paper, we demonstrate an active and fast control of the charge state and hence of the optical and electronic properties of single and near-surface nitrogen-vacancy centres (NV centres) in diamond. This active manipulation is achieved by using a two-dimensional Schottky-diode structure from diamond, i.e., by using aluminium as Schottky contact on a hydrogen terminated diamond surface. By changing the applied potential on the Schottky contact, we are able to actively switch single NV centres between all three charge states NV+, NV0 and NV− on a timescale of 10 to 100 ns, corresponding to a switching frequency of 10–100 MHz. This switching frequency is much higher than the hyperfine interaction frequency between an electron spin (of NV−) and a nuclear spin (of 15N or 13C for example) of 2.66 kHz. This high-frequency charge state switching with a planar diode structure would open the door for many quantum optical applications such as a quantum computer with single NVs for quantum information processing as well as single 13C atoms for long-lifetime storage of quantum information. Furthermore, a control of spectral emission properties of single NVs as a single photon emitters – embedded in photonic structures for example – can be realized which would be vital for quantum communication and cryptography.

Charge state switching of deep levels for low-power optical modulation in silicon waveguides

2011 ◽  
Vol 36 (19) ◽  
pp. 3717 ◽  
Author(s):  
D. F. Logan ◽  
P. Velha ◽  
M. Sorel ◽  
R. M. De La Rue ◽  
G. Wojcik ◽  
...  
Keyword(s):  
Low Power ◽  
Charge State ◽  
Deep Levels ◽  
Optical Modulation ◽  
Silicon Waveguides ◽  
State Switching

Exhibition of novel photocatalytic activity and photoluminescence properties with high inhibition towards bacterial growth by hydrothermally grown ZnO nanorods

2020 ◽  
Vol 16 ◽  
Author(s):  
Nihar Ranjan Panda ◽  
Dojalisa Sahu
Keyword(s):  
Methylene Blue ◽  
Bacterial Growth ◽  
Organic Dyes ◽  
Zno Nanorods ◽  
Antibacterial Properties ◽  
Crystallographic Structure ◽  
Inhibition Activity ◽  
Electron Microscopic ◽  
Skin Bacteria ◽  
High Inhibition

Background: Metal oxide nanomaterial such as; ZnO shows novel structural, optical, electrical and antibacterial properties due to wide band gap (3.37 eV) and high excitonic binding energy (60 meV). Probing these inherent properties of nanosized ZnO with different morphology has generated new interest among researchers Objective: To investigate the size dependent functional attributes, ZnO nanorods were prepared by hydrothermal method and the photocatalytic (PC) efficiency was studied. The photoluminescence (PL) property of ZnO nanorods was also studied by recording the emission spectrum under photo-excitation. These nanorods (NRs) were coated on cotton fabric to study the effectiveness of these NRs in defending and inhibiting the growth of different bacteria Methods: The crystallographic structure and morphology of the ZnO samples were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopic (FESEM) measurements. PL measurement at room temperature was undertaken by exciting the sample with light of wavelength 350 nm. The PC property of ZnO NRs was studied in degrading organic dyes like methylene blue. Bacteria like Staphylococcus aureus, Escherichia coli and Bacillus subtilis were cultured and the inhibition of growth of these bacteria was studied by the application of ZnO. To enhance the microbe defence mechanism of fabric, we coated these NRs on fabric test samples and investigated the bacterial growth on it. Results: XRD and FESEM studies reveal the dimension of the synthesized products in nano range. These nanorods are of high density and surface roughness as per the FESEM study. PL measurement shows the presence of strong UV emission at 382 nm with defect emissions in the blue-green region opening up the path for ZnO to be used in fabrication of optoelectronic devices. PC study reveals that 89% degradation of methylene blue (MB) dye is achievable in 180 min using these ZnO catalysts. The anti-bacterial study shows that the minimum inhibitory concentration (MIC) of ZnO nanorods coated on the fabric against S. aureus is found to be 3.5 mg/ml which is the minimum as compared to E. coli (7.5 mg/ml) and B. subtilis (5.5 mg/ml). The study further enunciates that fabric coated with ZnO samples exhibited considerably high inhibition activity toward S. aureus. Conclusion: The study shows that ZnO NRs can be effectively used for fabrication of UV-LASER/LED. Photocatalytic efficiency of ZnO will be useful for degradation of organic dyes controlling environment pollution. It further enunciates that fabric coated with ZnO samples exhibited considerably high inhibition activity toward S. aureus (skin bacteria) which will be helpful in defending microbes if used in surgical cotton bandages

Application of ZnO nanorods doped with Cu for enhanced sonocatalytic removal of Cr(VI) from aqueous solutions

2019 ◽  
Vol 27 (3) ◽  
pp. 2691-2706 ◽  
Author(s):  
Kazem Godini ◽  
Mahsa Tahergorabi ◽  
Mohammad Naimi-Joubani ◽  
Mehdi Shirzad-Siboni ◽  
Jae-Kyu Yang
Keyword(s):  
Aqueous Solutions ◽  
Zno Nanorods
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