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xiv CONTENTS Contributions Paper III: This was the third published paper with me as the first author. Renyun Zhang did experiments on triboelectric nanogenerators (TENG:s) and I became interested in how they worked. The temperature dependence for the charging at contact had just recently been investigated for a generator using Al and PTFE (teflon) as contact materials, but the charging mechanism for triboelectric sys- tems containing non-metals was disputed: electron transfer or ion transfer? I made a two-level Schottky ion transfer model for this system comparing it to experimental data found in three references. The characteristic temperature for the transition be- tween the two levels obtained from fitting the Schottky model to the data was of the right magnitude for physically adsorbed atoms. I was the main writer of the paper withsupportofJonasO ̈rtegren,SalimReza,HenrikAnderssonandHa ̊kanOlinwho commented on the text. Contributions Paper IV: This was the fourth published paper and my second about triboelectricity. Renyun Zhang made a wind-driven triboelectric nanogener- ator consisting of a plastic ribbon that could flutter between two copper electrodes. He tested it in a table-top sized wind tunnel studying the frequency and voltage re- sponse at different wind speeds and gave me the data to analyze. Behind an obstacle in a flowing fluid, a von Karman vortex street is generated and I fitted this model to data and found that the fluttering frequency of the plastic ribbon was proportional to the von Karman frequency. The result of the analysis indicated that different har- monics could be excited in the plastic ribbon depending on the electrode distance. I wrotethepaperwiththesupportofJonasO ̈rtegren,HenrikAndersson,YaYangand Ha ̊kan Olin. Renyun and I made two figures each in the paper. List of papers not included in the thesis: A. Renyun Zhang, Henrik A. Andersson, Mattias Andersson, Britta Andres, Ha ̊kan Edlund,PerEdstro ̈m,SverkerEdvardsson,SvenForsberg,MagnusHummelga ̊rd, Niklas Johansson, Kristoffer Karlsson, Hans-Erik Nilsson, Magnus Norgren, Mar- tinOlsen,TetsuUesaka,ThomasO ̈hlundandHa ̊kanOlinSoap-filmcoating:High- speed deposition of multilayer nanofilms. Scientific Reports (2013), volume 3, article id. 1477 B. RenyunZhang,HenrikAndersson,MartinOlsen,MagnusHummelga ̊rd,Sverker Edvardsson, Hans-Erik Nilsson and Ha ̊kan Olin Piezoelectric gated ZnO nanowire diode studied by in situ TEM probing. Nano Energy (2014), volume 3, pages 10-15 C.RenyunZhang,MagnusHummelga ̊rd,MartinOlsen,JonasO ̈rtegrenandHa ̊kan Olin Nanogenerator made of ZnO nanosheet networks. Semiconductor Science and Technology (2017), volume 32, nr 5, article id. 054002 D. RenyunZhang,MagnusHummelga ̊rd,VivianeForsberg,HenrikAndersson,Mag- nusEngholm,ThomasO ̈hlund,MartinOlsen,JonasO ̈rtegren,andHa ̊kanOlin Photoconductivity of acid exfoliated and flash-light-processed MoS2 films. Scientific Reports (2018), volume 8, article id 3296PDF Image | Nanomechanics Quantum Size Effects, Contacts, and Triboelectricity
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