Formation of core-shell nanostructure through wrapping of cuprous oxide nanowires by hydrogen titanate nanotubes

Patra, Shyamapada; Das, Pritam; Rajbhar, Manoj K.; Facsko, Stefan; Möller, W.; Chatterjee, Shyamal

doi:10.1016/j.radphyschem.2022.110103

Cited by 10 publications

(6 citation statements)

References 41 publications

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“…The magnified image in the inset reveals that the surface has become slightly rough, which is usually the result of ion beam sputtering and surface diffusion. Prior research on oxide has shown the presence of rough surface due to surface defects as a result of preferential sputtering and surface diffuision. − Surface modification and roughening in large amounts by ion irradiation may change the cladding’s refractive index, enabling more modes in the cladding region than in the core. , In the present study, however, at the energies used in this study, the ions enter through the surface and implanted inside the cladding regionas well as create defects inside, and hence less surface damage is expected to happen.…”

Section: Resultsmentioning

confidence: 78%

Detection of Energetic Ions Based on Tapered Optical Fiber

Rajbhar

Maharana

Patra

et al. 2023

ACS Appl. Opt. Mater.

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Single-mode tapered optical fibers (TOF) are well-known for applications in sensing. In this work, we demonstrate the use of tapered optical fibers to detect charged particles (ions) irradiated at various energies, fluences, and species. In this experiment, two different ion species, namely, Ar+ and N+, have been used to irradiate tapered optical fibers at various fluences and energies. The variations in the free spectral range (FSR), period, and transmission power loss from the ion beam irradiated TOFs are picked up by the optical spectrum analyzer (OSA). We were able to identify ions with energy as low as 80 keV because of the change in the refractive index of the cladding material caused by the implanted ions. The observed changes in spectra are explained using the results of COMSOL simulations. Using Monte Carlo-based TRI3DYN ion–solid interaction simulation, the surface modification and defect formation caused by ion beams as well as the implantation profile in the TOF have been predicted. These results are further corroborated by experimental studies such as scanning electron microscopy and Raman scattering spectroscopy. Such a tapered optical fiber-based detection method will aid in the creation of portable equipment to identify charged particles in nuclear reactors and in space exploration.

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Section: Resultsmentioning

confidence: 78%

Detection of Energetic Ions Based on Tapered Optical Fiber

Rajbhar

Maharana

Patra

et al. 2023

ACS Appl. Opt. Mater.

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“…6 Therefore, wrapping and heterojunctions give a practical approach to developing high-performance electronic devices. 7,8 Here, we demonstrate the formation of core−shell heterostructure in 1D form by ion irradiation and show how such a structure can be extremely useful for designing an electrical nose to sense hydrogen gas.…”

Section: ■ Introductionmentioning

confidence: 90%

“…Compared to a vertical or a parallel configuration of nanostrcutures, a twisted heterostructure has compact size and at the surface both the individual nanostrcutures as well as their junction areas are exposed to interact with the surrounding . Therefore, wrapping and heterojunctions give a practical approach to developing high-performance electronic devices. , Here, we demonstrate the formation of core–shell heterostructure in 1D form by ion irradiation and show how such a structure can be extremely useful for designing an electrical nose to sense hydrogen gas.…”

Section: Introductionmentioning

confidence: 92%

Core–Shell Nanostructures of Tungsten Oxide and Hydrogen Titanate for H₂ Gas Adsorption

Rajbhar

Das

Möller

et al. 2022

ACS Appl. Nano Mater.

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Nanostructured tungsten oxide is a promising material for sensing reducing gases such as hydrogen. However, this material exhibits limitations due to a poor response toward sensing at room temperature, incomplete recovery to the initial state, long response time, and a low response factor, which is not desired for explosive gases like hydrogen. In this work, we, for the first time, demonstrate that these limitations can be significantly overcome using the core–shell structure of tungsten oxide (WO3) nanorods and hydrogen titanate (H2Ti3O7) nanotubes developed and suitably defect-engineered by low-energy ion irradiation. The sensor based on the pristine core–shell heterostructure of tungsten oxide nanorods and hydrogen titanate nanotubes exhibits excellent response and selectivity to different concentrations of H2 ranging from 10 to 500 ppm. However, it requires a quite high temperature of 300 °C with response and recovery times of about 38 and 99.8 s, respectively. After irradiation, the hybrid form shows a similar level of response and selectivity, however, at a much lower temperature of about 120 °C with significantly faster response and recovery times of about 16 and 18 s, respectively. Such an ion beam-modified structure addresses critical issues of developing a gas-sensing device, such as the effects of moisture and power consumption. The experimental observations are very well in agreement with the predictions of the state-of-the-art Monte Carlo-based TRI3DYN ion-solid interaction simulation, and the gas-sensing mechanism was explained using first principles-based calculation. The study reveals that low-energy ion-induced defect engineering yields better charge transport, better binding of the gas with the surface, as well as the superior moisture-repelling ability of the surface, leading to better sensing performance than the pristine core-shell structure. This heterostructure between two nanomaterials carries complementary advantages in various aspects, such as the surface area, conductivity, and sensitivity toward a wide range and mixture of gases. Additionally, the wrapping yields good mechanical strength and flexibility, making it possible to use as a flexible sensing device made through a bottom-up fabrication technique.

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“…Previous studies on Ar + ion irradiation have shown remarkable enhancements in properties, such as gas sensing, 16 optical detection, 17 energy storage, 18 hydrogen adsorbtion, 19 nano-device fabrication 20,21 etc., owing to changes in the surface defects and morphological modifications. 22,23 Other important aspects of 1D hematite are its application in sensing, catalysis, and energy devices. Different approaches have been used to enhance the effectiveness of hematite nanostructures.…”

Section: Introductionmentioning

confidence: 99%