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UID:20260525T171143EDT-8551EJuxi7@132.216.98.100
DTSTAMP:20260525T211143Z
DESCRIPTION:Abstract\n\nThis thesis concerns concepts in noise analysis\, t
 hermoelectric devices\, and electrochemical sensors\, presenting findings 
 across these interconnected fields. In part one\, the research advances th
 e understanding of thermoelectric materials by extending the fluctuation-d
 issipation theorem to reveal the relationship between temperature and volt
 age fluctuations. This theoretical framework is validated through experime
 nts with an ultra-fast thermoelectric micro-device\, demonstrating an enha
 nced voltage fluctuation spectral density beyond the famed Johnson-Nyquist
  noise of Ohmic materials. The practical implications for temperature meas
 urement by thermoelectric response are discussed.\n\nIn part two\, 1/f noi
 se in graphene field-effect transistors is studied\, as this is the primar
 y source of noise that limits the resolution of graphene field-effect tran
 sistor-based chemical sensors. Experiments demonstrating a facile method t
 o reduce noise by scaling the active area of the sensors are presented\, r
 esulting in the lowest room temperature 1/f noise in a graphene transistor
  reported to date. This advancement leads to the development of a sulfate 
 ion sensor with unprecedented resolution of 1.2 × 10^-3 log molar concentr
 ation units\, showcasing the potential of graphene-based sensors in high-r
 esolution chemical sensing applications.\n\nFinally\, in the third part\, 
 attention is turned to the reference electrode and its stability. All pote
 ntiometric sensors working in a liquid environment require an element sens
 itive to the analyte and a reference electrode. The study introduces a nov
 el solid reservoir reference electrode designed to provide stable electroc
 hemical measurements and overcome the high manufacturing cost\, short shel
 f life\, and wet storage requirements of traditional liquid-filled electro
 des. The solid reservoir reference electrode features a construction analo
 gous to the liquid-filled Ag/AgCl electrode\, with an Ag/AgCl layer\, a so
 lid KCl reservoir\, and a porous polydimethylsiloxane membrane\, allowing 
 for planar processing. The new electrode's performance is evaluated in aqu
 eous and non-aqueous solvents like acetonitrile. The electrode's open circ
 uit potential drift was less than 0.37 mV over 17 hours in deionized water
  and less than 3 mV over 8 hours in acetonitrile. In applications relating
  to electrocardiogram and electroencephalogram measurements\, the solid re
 servoir reference electrode demonstrates a 50% improvement in signal-to-no
 ise ratio.\n
DTSTART:20241107T183000Z
DTEND:20241107T203000Z
LOCATION:Room 603\, McConnell Engineering Building\, CA\, QC\, Montreal\, H
 3A 0E9\, 3480 rue University
SUMMARY:PhD defence of Minh Tran – Fluctuation and Stability in Potentiomet
 ric Sensors
URL:/ece/channels/event/phd-defence-minh-tran-fluctuat
 ion-and-stability-potentiometric-sensors-360740
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