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Effect of gamma irradiation on Schottky-contacted vertically aligned ZnO nanorod-based hydrogen sensor
Sapana Ranwa, Surendra Singh Barala, Mattia Fanetti, Mahesh Kumar, 2016, original scientific article

Abstract: We report the impact of gamma irradiation on the performance of a gold Schottky-contacted ZnO nanorod-based hydrogen sensor. RF-sputtered vertically aligned highly c-axis-oriented ZnO NRs were grown on Si(100) substrate. X-ray diffraction shows no significant change in crystal structure at low gamma doses from 1 to 5 kGy. As gamma irradiation doses increase to 10 kGy, the single crystalline ZnO structure converts to polycrystalline. The photoluminescence spectra also shows suppression of the near-band emission peak and the huge wide-band spectrum indicates the generation of structural defects at high gamma doses. At 1 kGy, the hydrogen sensor response was enhanced from 67% to 77% for 1% hydrogen in pure argon at a 150 °C operating temperature. However, at 10 kGy, the relative response decreases to 33.5%. High gamma irradiation causes displacement damage and defects in ZnO NRs, and as a result, degrades the sensor's performance as a result. Low gamma irradiation doses activate the ZnO NR surface through ionization, which enhances the sensor performance. The relative response of the hydrogen sensor was enhanced by ∼14.9% with respect to pristine ZnO using 1 kGy gamma ray treatment. © 2016 IOP Publishing Ltd.
Found in: ključnih besedah
Keywords: ZnO, nanorods, gamma irradiation, sensor
Published: 12.01.2017; Views: 2014; Downloads: 0
.pdf Fulltext (4,60 MB)

Observations of M31 and M33 with the Fermi Large Area Telescope: A Galactic Center Excess in Andromeda?
Gabrijela Zaharijas, 2017, original scientific article

Found in: ključnih besedah
Summary of found: ... gamma-rays, Fermi LAT, Andromeda galaxy...
Keywords: gamma-rays, Fermi LAT, Andromeda galaxy
Published: 07.03.2017; Views: 2231; Downloads: 1
.pdf Fulltext (1,35 MB)

Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1713.7−3946
Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Samo Stanič, Gašper Kukec Mezek, F. Acero, 2017, original scientific article

Found in: ključnih besedah
Summary of found: ...very-high energy gamma-rays, supernova remnants (SNR), SNR RX J1713.7−3946, Cherenkov Telescope Array...
Keywords: very-high energy gamma-rays, supernova remnants (SNR), SNR RX J1713.7−3946, Cherenkov Telescope Array
Published: 10.05.2017; Views: 2287; Downloads: 0
.pdf Fulltext (997,39 KB)

New Frontiers in Black Hole Astrophysics
2017, proceedings of peer-reviewed scientific conference contributions (international and foreign conferences)

Found in: ključnih besedah
Keywords: astronomy, black holes, active galactic nuclei, gamma ray bursts, tidal disruption events, gravitational waves
Published: 17.08.2017; Views: 1705; Downloads: 0
.pdf Fulltext (106,73 KB)

Polarimetry and Photometry of Gamma-Ray Bursts with RINGO2
Andreja Gomboc, 2017, original scientific article

Found in: ključnih besedah
Keywords: astronomy, gamma ray bursts, polarisation
Published: 17.08.2017; Views: 1545; Downloads: 0
.pdf Fulltext (1,65 MB)

Ricerca di segnali di decadimento di materia oscura nell'emissione gamma isotropa rilevata dall'esperimento Fermi-LAT
Valentina Buran, master's thesis

Found in: ključnih besedah
Keywords: gamma rays
Published: 28.08.2017; Views: 1767; Downloads: 0
.pdf Fulltext (11,36 MB)

Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A
Jagdish Joshi, Marlui Miranda, Lili Yang, Soebur Razzaque, 2017, published scientific conference contribution abstract

Abstract: The association of at least a dozen ultrahigh-energy cosmic-ray (UHECR) events with energy 54 EeV or higher detected by the Pierre Auger Observatory from the direction of Centaurus-A, the nearest radio galaxy, supports the scenario of UHECR acceleration in the jets of radio galaxies. Multiwavelength observations of Centaurus-A suggest that the inner jet is likely the site for particle acceleration, which emits in X-ray to very high-energy (VHE) gamma-ray. We model broadband spectral energy distribution with emission from shock-accelerated electrons and protons in a combined synchrotron-self-Compton and photo-hadronic scenario. The UHECR flux from Centaurus-A, required to explain Pierre Auger data, successfully explains observed VHE gamma rays as photo-hadronic emission.
Found in: ključnih besedah
Keywords: Centaurus A, gamma ray, cosmic rays
Published: 17.01.2018; Views: 1389; Downloads: 0
.pdf Fulltext (2,27 MB)

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