Transition metal (Co, Mn) co-doped ZnO nanoparticles: Effect on structural and optical properties

Publication date: 25 March 2017
Source:Journal of Alloys and Compounds, Volume 698
Author(s): Darshan Sharma, Ranjana Jha
Pure ZnO and Co/Mn co-doped ZnO {Zn0.98-xCo0.02MnxO (0 ≤ x ≤ 0.06)} nanoparticles were synthesized by co-precipitation method. The structural, morphological and optical properties of prepared samples were explored in detail. Rietveld refinement of x-ray diffraction (XRD) data revealed the single phase, hexagonal wurtzite structure without any impurity phase. XRD and Fourier transform infra-red (FTIR) analysis confirmed the incorporation of Co/Mn ions at Zn site into host lattice structure. The morphology of samples was examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis. The particle size from TEM results was corroborated well with XRD data. The absorption spectra showed the initial decrease in optical energy band gap for low Mn concentration. The optical energy band gap further increased with a higher Mn concentration in co-doped ZnO samples. Photoluminescence (PL) spectra showed five emission peaks due to different defect states. The paper enhances the understanding of structural, optical properties of Co/Mn co-doped nanocrystals. This paves the path for its potential application in the optoelectronic devices e.g. solar cell.

Graphical abstract

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Influence of Al doping on the structural, morphological, optical, and gas sensing properties of ZnO nanorods

Publication date: 25 March 2017
Source:Journal of Alloys and Compounds, Volume 698
Author(s): R. Sankar ganesh, M. Navaneethan, Ganesh Kumar Mani, S. Ponnusamy, K. Tsuchiya, C. Muthamizhchelvan, S. Kawasaki, Y. Hayakawa
Ammonia is one of the most hazardous substance and highly toxic to human health when inhaled above the moderate level. Sensing ammonia is one most challenging task at low temperature level and room temperature. ZnO and Al-doped ZnO nanostructures were successfully synthesized by sol–gel method, and their structural, optical, morphological, and gas sensing properties were investigated. Field-emission scanning electron microscopy revealed that the ZnO nanorods transformed into particles upon incorporation of Al. Transmission electron microscopy and high-resolution transmission electron microscopy confirmed that both the ZnO nanorods and Al-doped ZnO nanoparticles were crystalline. Fourier transform infrared spectroscopy analysis indicated the presence of Zn–O and Al–O in the nanostructures. Energy-dispersive X-ray spectroscopy revealed the presence of Al in the Al-doped ZnO materials. The ammonia gas sensing analysis revealed that the Al-doped ZnO nanoparticles displayed a higher response than the ZnO nanorods. Moreover, among the doped samples, that containing 6 wt% Al dopant exhibited the highest response of 350 when exposed to 100 ppm ammonia gas. The higher sensing efficiency of the Al-doped ZnO nanostructures was attributed to changes in structural defects in Al-doped ZnO, as confirmed by X-ray photoelectron spectroscopy analysis.



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Cross-reactive LTP sensitization in food-dependent exercise-induced urticaria/anaphylaxis: a pilot study of a component-resolved and in vitro depletion approach

Challenge tests for food-dependent exercise-induced anaphylaxis (FDEIA) carry some risk and have a high rate of false negatives. Our aim was to explore the usefulness of an in vitro immunodepletion assay and a...

http://ift.tt/2i9FOg4

Cross-reactive LTP sensitization in food-dependent exercise-induced urticaria/anaphylaxis: a pilot study of a component-resolved and in vitro depletion approach

Challenge tests for food-dependent exercise-induced anaphylaxis (FDEIA) carry some risk and have a high rate of false negatives. Our aim was to explore the usefulness of an in vitro immunodepletion assay and a...

http://ift.tt/2i9FOg4

Dutch Melanoma Treatment Registry: Quality assurance in the care of patients with metastatic melanoma in the Netherlands

Publication date: February 2017
Source:European Journal of Cancer, Volume 72
Author(s): Anouk Jochems, Maartje G. Schouwenburg, Brenda Leeneman, Margreet G. Franken, Alfons J.M. van den Eertwegh, John B.A.G. Haanen, Hans Gelderblom, Carin A. Uyl-de Groot, Maureen J.B. Aarts, Franchette W.P.J. van den Berkmortel, Willeke A.M. Blokx, Mathilde C. Cardous-Ubbink, Gerard Groenewegen, Jan Willem B. de Groot, Geke A.P. Hospers, Ellen Kapiteijn, Rutger H. Koornstra, Wim H. Kruit, Marieke W. Louwman, Djura Piersma, Rozemarijn S. van Rijn, Albert J. ten Tije, Gerard Vreugdenhil, Michel W.J.M. Wouters, Jacobus J.M. van der Hoeven
BackgroundIn recent years, the treatment of metastatic melanoma has changed dramatically due to the development of immune checkpoint and mitogen-activated protein (MAP) kinase inhibitors. A population-based registry, the Dutch Melanoma Treatment Registry (DMTR), was set up in July 2013 to assure the safety and quality of melanoma care in the Netherlands. This article describes the design and objectives of the DMTR and presents some results of the first 2 years of registration.MethodsThe DMTR documents detailed information on all Dutch patients with unresectable stage IIIc or IV melanoma. This includes tumour and patient characteristics, treatment patterns, clinical outcomes, quality of life, healthcare utilisation, informal care and productivity losses. These data are used for clinical auditing, increasing the transparency of melanoma care, providing insights into real-world cost-effectiveness and creating a platform for research.ResultsWithin 1 year, all melanoma centres were participating in the DMTR. The quality performance indicators demonstrated that the BRAF inhibitors and ipilimumab have been safely introduced in the Netherlands with toxicity rates that were consistent with the phase III trials conducted. The median overall survival of patients treated with systemic therapy was 10.1 months (95% confidence interval [CI] 9.1–11.1) in the first registration year and 12.7 months (95% CI 11.6–13.7) in the second year.ConclusionThe DMTR is the first comprehensive multipurpose nationwide registry and its collaboration with all stakeholders involved in melanoma care reflects an integrative view of cancer management. In future, the DMTR will provide insights into challenging questions regarding the definition of possible subsets of patients who benefit most from the new drugs.



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Fetus in the Bladder: Rare Complication of Vesicouterine Fistula

The work presents a rare case of spontaneous migration of an 11-week fetus from the uterine cavity into the urinary bladder cavity through the long-standing vesicouterine fistula.

http://ift.tt/2ivWpat

Otitis media in children: A proposal for a new nosological classification.

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Otitis media in children: A proposal for a new nosological classification.

Int J Pediatr Otorhinolaryngol. 2016 Jun 07;:

Authors: Torretta S, Marchisio P

PMID: 28011068 [PubMed - as supplied by publisher]

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