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You searched for subject:(Solution based deposition). Showing records 1 – 2 of 2 total matches.

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Oregon State University

1. Durgan, Christopher J. Solution-based deposition of functional thin films : development of a glucose biosensor and thermal processing of CZTS nanoparticle films.

Degree: MS, Chemical Engineering, 2013, Oregon State University

The development of solution-based methods for deposition of different thin film material is presented as an alternative to high cost vacuum-based methods. For certain materials, vacuum techniques are unsuitable for processing. Additionally, vacuum-based processes present high capital costs associated with equipment, and slow processing times. Atmospheric pressure solution based techniques are attractive and lend themselves to high-throughput processing using methods such as graphic patterning or roll-to-roll processing. This research details the development of solution-based outer layers for a continuous glucose biosensor. The biosensor is based on a biological ink deposited by electrohydrodynamic printing (EHDP), encapsulated by a biocompatible permselective membrane which enhances the sensor function and working lifetime. EHDP is a noncontact patterning method where ink is deposited by the application of high electric fields to a conductive microcapillary, resulting in the jetting of ionized ink droplets with precise placement. This research also examines the processing window of radiant arc plasma pulsed thermal processing (PTP) on thin films of copper zinc tin sulfide (CZTS) nanoparticles. CZTS is an attractive solar absorbing material for low cost thin film solar cells. CZTS has a near-optimal band gap of 1.5 eV and a high absorption coefficient. In this study, CZTS nanoparticles are synthesized using a continuous flow reactor, and deposited by spin-coating on substrates for PTP. The effects of PTP on film morphology and crystalline phase are investigated using scanning electon microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy. Advisors/Committee Members: Herman, Gregory S. (advisor), Chang, Chih-Hung (committee member).

Subjects/Keywords: Solution-based deposition; Biosensors  – Design and construction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Durgan, C. J. (2013). Solution-based deposition of functional thin films : development of a glucose biosensor and thermal processing of CZTS nanoparticle films. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/44910

Chicago Manual of Style (16th Edition):

Durgan, Christopher J. “Solution-based deposition of functional thin films : development of a glucose biosensor and thermal processing of CZTS nanoparticle films.” 2013. Masters Thesis, Oregon State University. Accessed October 23, 2019. http://hdl.handle.net/1957/44910.

MLA Handbook (7th Edition):

Durgan, Christopher J. “Solution-based deposition of functional thin films : development of a glucose biosensor and thermal processing of CZTS nanoparticle films.” 2013. Web. 23 Oct 2019.

Vancouver:

Durgan CJ. Solution-based deposition of functional thin films : development of a glucose biosensor and thermal processing of CZTS nanoparticle films. [Internet] [Masters thesis]. Oregon State University; 2013. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/1957/44910.

Council of Science Editors:

Durgan CJ. Solution-based deposition of functional thin films : development of a glucose biosensor and thermal processing of CZTS nanoparticle films. [Masters Thesis]. Oregon State University; 2013. Available from: http://hdl.handle.net/1957/44910


Oregon State University

2. Chang, Yu-Jen. Investigation of low temperature solution-based deposition process for flexible electronics.

Degree: PhD, Chemical Engineering, 2007, Oregon State University

The critical contribution of this dissertation is to provide a better understanding of the fundamental Chemical Bath Deposition (CBD) growth kinetic and mechanism for the well known II-VI semiconductor CdS using the newly developed continuous flow microreactor. This continuous flow microreactor provides the temporal resolution to control the homogeneous reaction of the chemical solution before it impinges on the substrate surface. This capability was used to decouple the homogeneous particle formation and deposition from the molecular level heterogeneous surface reaction to overcome the drawbacks associated with a conventional batch process. Transmission electron microscopy (TEM) analysis indicated an impinging flux without the formation of nanoparticles which could be obtained from this reactor in a short residence time. In addition, the reactor could be operated in a homogeneous particle formation regime. Size increasing CdS nanoparticles grown by homogeneous reaction were clearly observed from TEM and SEM micrographs by increasing the residence time from 1 to 280 sec using pre-heated precursor solutions. The formation of CdS nanorod and arrayed nanorod bundle structures using the CBD recipe were also observed in some areas and reported here for the first time. The growth kinetics were studied using a particle-free flux. The deposition results suggest that HS− ions formed through the thiourea hydrolysis reaction are the dominant sulfide ion source responsible for the CdS deposition rather than thioura itself that had been widely discussed in almost all of the previous literature. This finding could not be observed previously by a conventional CBD batch setup because all the reactant solutions were sequentially pulled into the reaction beaker and mixed all at once. An impinging flux without the formation of nanoparticles enables us to deposit extremely smooth and highly oriented nanocrystalline CdS semiconductor thin films at low temperature (80°C). Enhancement-mode functional thin film transistors with an effective mobility of μ[subscript eff] =1.46 cm²/V s, drain current on-to-off ratio of approximately 10⁵ and turn-on voltage at 0 V were fabricated from the asdeposited films without any post annealing process. This microreactor could be adapted for the deposition of other compound semiconductor thin films such as highly transparent amorphous Indium Oxide (In₂O₃) thin films at low temperature (70°C) using chemical solution deposition and opens a low-cost avenue to fabricate thin film flexible electronics on polymeric substrates. Advisors/Committee Members: Chang, Chih-Hung (advisor), Kimura, Shoichi (committee member).

Subjects/Keywords: Solution-based Deposition; Semiconductor films

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chang, Y. (2007). Investigation of low temperature solution-based deposition process for flexible electronics. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/4018

Chicago Manual of Style (16th Edition):

Chang, Yu-Jen. “Investigation of low temperature solution-based deposition process for flexible electronics.” 2007. Doctoral Dissertation, Oregon State University. Accessed October 23, 2019. http://hdl.handle.net/1957/4018.

MLA Handbook (7th Edition):

Chang, Yu-Jen. “Investigation of low temperature solution-based deposition process for flexible electronics.” 2007. Web. 23 Oct 2019.

Vancouver:

Chang Y. Investigation of low temperature solution-based deposition process for flexible electronics. [Internet] [Doctoral dissertation]. Oregon State University; 2007. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/1957/4018.

Council of Science Editors:

Chang Y. Investigation of low temperature solution-based deposition process for flexible electronics. [Doctoral Dissertation]. Oregon State University; 2007. Available from: http://hdl.handle.net/1957/4018

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