The optical properties and energy transition process in nanocomposite of polyvinyl-pyrrolidone polymer and Mn-doped ZnS

2012 ◽  
Vol 45 (2) ◽  
pp. 147-159 ◽  
Author(s):  
Thi Tran Minh ◽  
Ben Pham Van ◽  
Thai Dang Van ◽  
Hien Nguyen Thi
2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Tran Minh Thi ◽  
Le Van Tinh ◽  
Bui Hong Van ◽  
Pham Van Ben ◽  
Vu Quoc Trung

We report the optical properties of polyvinyl-pyrrolidone (PVP) and the influence of PVP concentration on the photoluminescence spectra of the PVP (PL) coated ZnS : Ni nanocrystalline thin films synthesized by the wet chemical method and spin-coating. PL spectra of samples were clearly showed that the 520 nm luminescence peak position of samples remains unchanged, but their peak intensity changes with PVP concentration. The PVP polymer is emissive with peak maximum at 394 nm with the exciting wavelength of 325 nm. The photoluminescence exciting (PLE) spectrum of PVP recorded at 394 nm emission shows peak maximum at 332 nm. This excitation band is attributed to the electronic transitions in PVP molecular orbitals. The absorption edges of the PVP-coated ZnS : Ni0.3% samples that were shifted towards shorter wavelength with increasing of PVP concentration can be explained by the absorption of PVP in range of 350 nm to 400 nm. While the PVP coating does not affect the microstructure of ZnS : Ni nanomaterial, the analyzed results of the PL, PLE, and time-resolved PL spectra and luminescence decay curves of the PVP and PVP-coated ZnS : Ni samples allow to explain the energy transition process from surface PVP molecules to the Ni2+centers that occurs via hot ZnS.


2021 ◽  
Vol 13 (2) ◽  
pp. 715
Author(s):  
Jurrit M. Bergsma ◽  
Jeroen Pruyn ◽  
Geerten van de Kaa

Energy transition is affecting the European maritime sector at an increasing rate. New technologies and regulations are being introduced with increasing speed. The ability to adapt to these changes is crucial for the economic success of the maritime sector. However, the sector is challenged by inertia due to its global nature and long-life assets (e.g., vessels). These developments result in a globally projected greenhouse gas emission growth rather than a reduction towards 2050. The sector can be considered essential to economic prosperity, but its innovation system should align with global sustainability trends. This article aims to structure and evaluate the maritime sector’s systemic challenges by conducting an extensive systematic review of (sustainable) maritime innovation literature. These findings are structured and discussed via four key activities that support the transition process: developing strategy and policy, creating legitimacy, mobilizing resources, and developing and disseminating knowledge.


2020 ◽  
Vol 77 (7) ◽  
pp. 587-591
Author(s):  
Rundong Liang ◽  
Xiuwen Zhao ◽  
Guichao Hu ◽  
Weiwei Yue ◽  
Xiaobo Yuan ◽  
...  

2021 ◽  
pp. 102295
Author(s):  
Jeferson A. Dias ◽  
Ana L.F. Freire ◽  
Isabelly Girotto ◽  
Carolina Del Roveri ◽  
Valmor R. Mastelaro ◽  
...  

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Iain Todd ◽  
Darren McCauley

AbstractThe compelling need to tackle climate change is well-established. It is a challenge which is being faced by all nations. This requires an approach which is truly inter-disciplinary in nature, drawing on the expertise of politicians, social scientists, and technologists. We report how the pace of the energy transition can be influenced significantly by both the operation of societal barriers, and by policy actions aimed at reducing these effects. Using the case study of South Africa, a suite of interviews has been conducted with diverse energy interests, to develop and analyse four key issues pertinent to the energy transition there. We do so primarily through the lens of delivering energy justice to that society. In doing so, we emphasise the need to monitor, model, and modify the dynamic characteristic of the energy transition process and the delivery of energy justice; a static approach which ignores the fluid nature of transition will be insufficient. We conclude that the South African fossil fuel industry is still impeding the development of the country’s renewable resources, and the price of doing so is being met by those living in townships and in rural areas.


Author(s):  
Fabia Farlin Athena ◽  
Tilottoma Saha ◽  
Md Rafiqul Islam ◽  
M. A. Matin ◽  
Ahmed Sharif

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