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Helena I. S. Nogueira

Researcher at University of Coimbra

Publications -  205
Citations -  6247

Helena I. S. Nogueira is an academic researcher from University of Coimbra. The author has contributed to research in topics: Overweight & Raman spectroscopy. The author has an hindex of 38, co-authored 195 publications receiving 5048 citations. Previous affiliations of Helena I. S. Nogueira include University of Western Australia & University of Reading.

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Journal ArticleDOI

Surface Modification of Graphene Nanosheets with Gold Nanoparticles: The Role of Oxygen Moieties at Graphene Surface on Gold Nucleation and Growth

Gil Gonçalves, +5 more
- 24 Sep 2009 - 
TL;DR: In this article, the authors show that the presence of oxygen functionalities at the graphene surface provides reactive sites for the nucleation and growth of gold nanoparticles, which are effectively grown at functionalized graphene surfaces using a simple chemical method in aqueous medium.
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Spatial and temporal distribution of microplastics in water and sediments of a freshwater system (Antuã River, Portugal).

Mariana Rodrigues, +6 more
- 15 Aug 2018 - 
TL;DR: Foams and fibers were the most abundant type in São João da Madeira, while fibers and fragments were themost abundant in Aguincheira and Estarreja in water and sediment samples, respectively.
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Novel lanthanide luminescent materials based on complexes of 3-hydroxypicolinic acid and silica nanoparticles

Paula C. R. Soares-Santos, +6 more
- 01 Jan 2003 - 
TL;DR: In this paper, the 3-hydroxypicolinic acid (HpicOH) was characterized using photoluminescence, infrared, Raman and H-1 NMR spectroscopy, and elemental analysis.
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Height and body-mass index trajectories of school-aged children and adolescents from 1985 to 2019 in 200 countries and territories: a pooled analysis of 2181 population-based studies with 65 million participants

Andrea Rodriguez-Martinez, +1361 more
- 07 Nov 2020 - 
TL;DR: Girls in South Korea, Vietnam, Saudi Arabia, Turkey, and some central Asian countries and boys in central and western Europe had the healthiest changes in anthropometric status over the past 3·5 decades because, compared with children and adolescents in other countries, they had a much larger gain in height than they did in BMI.
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A theoretical interpretation of the abnormal 5D0→7F4 intensity based on the Eu3+ local coordination in the Na9[EuW10O36]·14H2O polyoxometalate

R. A. Sá Ferreira, +5 more
- 01 Dec 2006 - 
TL;DR: In this article, the Na9[EuW10O36]·14H2O polyoxometalate studied here has shown a peculiar 4f-4f emission spectrum that has two main differences in comparison to data reported previously in the literature: a 5D0→7F0 line with much smaller intensity and an abnormally high intensity of the 5D 0→ 7F4 transition.