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Graphene is a very strong two-dimensional material with a lot of potential applications in microelectromechanical systems (MEMS). In this research, graphene is being optimized for use in a 5 m x 5 m graphene resonator. To work properly, this graphene resonator must have a uniform strain across all manufactured devices. To reduce strain induced in graphene sheets grown for use in these resonators, evaporated platinum has been used in this investigation due to its relatively lower surface roughness compared to copper films. The final goal is to have the layer of ultrathin platinum (<=200 nm) deposited on the MEMS graphene resonator and used to grow graphene directly onto the devices to remove the manual transfer step due to its inscalability. After growth, graphene is coated with polymer and the platinum is then etched. This investigation concentrated on the transfer process of graphene onto Si/SiO2 substrate from the platinum films. It was determined that the ideal platinum etchant was aqua regia at a volumetric ratio of 6:3:1 (H2O:HCl:HNO3). This concentration was dilute enough to preserve the polymer and graphene layer, but strong enough to etch within a day. Type and thickness of polymer support layers were also investigated. PMMA at a thickness of 200 nm was ideal because it was easy to remove with acetone and strong enough to support the graphene during the etch process. A reference growth recipe was used in this investigation, but now that the transfer has been demonstrated, growth can be optimized for even thinner films.
ContributorsCayll, David Richard (Author) / Tongay, Sefaattin (Thesis director) / Lee, Hyunglae (Committee member) / Mechanical and Aerospace Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12
Description
With the United States' diverse group of people, diverse set of beliefs and diverse cultural backgrounds, it’s no wonder that over the last few decades there has been a 51 percent increase in second-generation Americans in the United States (Child Trends, 2018). Though each of these second- and third-generation Americans experience life in the U.S. vastly different, the common steps of self-identity, acculturation and assimilation persist. However, what is often missed with this seemingly linear process is the delineating step: retro acculturation. Their sense of disconnect sparks a feeling of blurred identity, introducing the phenomenon of retro- acculturation, or an individual’s conscious efforts to connect to their heritage in new ways. Understanding the “why” behind this revelation is essential in understanding the “how”- or the actions taken by the individual to connect with their withdrawn culture. A deeper understanding of retro-acculturation and its processes is essential to leveraging a successful marketing effort in order to reach this demographic. As this population steadily reaches a larger population and quickly gains consumer buying power, it is important to be taking note of new and innovative ways of making lasting impressions on this demographic. This study focuses on exploring and discovering why individuals experience retro-acculturation and their triggers, as well as what approaches they use to connect to their heritage culture. Additionally, the insights gained were leveraged to provide recommendations as to how business can more effectively market to reach this demographic.
ContributorsHanson, Rebecca Jane (Co-author) / Burgess, Julia (Co-author) / Montoya, Detra (Thesis director) / Riker, Elise (Committee member) / School of International Letters and Cultures (Contributor) / Dean, W.P. Carey School of Business (Contributor) / Department of Management and Entrepreneurship (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05