Education and Experience

PARC, a Xerox company

Member of Research Staff (2018-Present), Post-doctoral Researcher (2017-2018)
As a member of the Electronic Materials and Devices Laboratory at PARC, I work to develop materials, processes, and applications for next-generation printed and flexible electronics, including printed sensors, hybrid chemical electronic systems, and systems that support energy storage and harvesting.

University of California, Berkeley

Ph.D. in Physical Chemistry (2012-2016)
As a graduate student, I developed and studied the mechanism for a new class of reactions for controlling nanocrystal surface chemistry, developed a new class of size-selective membranes for non-aqueous batteries, and studied the electrochemistry of redox-mediators for the electro-deposition of non-conductive energy storage materials. In each of these projects, I applied materials science and electrochemistry to solving applied problems in the fields of energy storage and conversion.
Co-advised by: Dr. Brett A. Helms (LBNL) and Prof. Omar Yaghi (UC Berkeley)
Selected Coursework: Statistical Mechanics, Materials Chemistry, and Surface Properties of Materials
Teaching: Organic chemistry laboratory (Chem 3AL), 3 semesters, 2012-2015

University of North Carolina at Chapel Hill

Bachelor of Science in Chemistry with Highest Distinction (2008-2012)
Advised by: Prof. Royce Murray. GPA: 3.92 cumulative, 3.95 chemistry.
Selected Coursework: Electroanalytical Chemistry, Separations, and Mechanisms of Organic and Inorganic Reactions.
Teaching: Volunteer chemistry tutor (Chemistry Resource Center), 2 semesters, 2010-2011

Skills

  • Synthesis

    Common organic, inorganic, and nanocrystal synthesis procedures, including oxygen and moisture-free atmosphere procedures (Schlenk and glove box techniques)

  • Electroanalytical techniques

    Cyclic voltammetry, chronoamperometry, rotating ring-disk electrode experiments, electrochemical impedance spectroscopy, and battery cycling (galvanostatic and potentiostatic)

  • Lab Management

    Experience setting up new lab space and infrastructure, including glove box maintenance and equipment requisition

  • Imaging

    Scanning Electron Microscopy (SEM), limited exposure to Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM)

  • Separations

    High pressure liquid chromatography (HPLC), capillary electrophoresis (CE), and gas chromatography-mass spectrometry (GC-MS)

  • Computers and Electronics

    Diagnosing hardware and software problems, hardware configuration, and software installation/configuration. Proficient in using Python for automated data analysis and instrument control.

  • Spectroscopy

    Experienced with Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), UV-Vis, FT-IR, and NMR spectroscopies (including advanced 2D NMR techniques)

  • Materials Characterization

    Thermogravimetric analysis, dynamic light scattering, zeta potential measurements, powder X-ray diffraction, Grazing Incidence Small Angle X-ray Scattering (GISAXS)

Publications

9. Doris, S.E.; Pierre, A.; Street, R.A. Dynamic and Tunable Threshold Voltage in Organic Electrochemical Transistors Adv. Mater. 2018, 30, 1706757

8. Ward, A.L.; Doris, S.E.; Li, L.; Hughes, M.A. Jr.; Qu, X.; Persson, K.A.; Helms, B.A. Materials Genomics Screens for Adaptive Ion Transport Behavior by Redox-Switchable Microporous Polymer Membranes in Lithium–Sulfur Batteries ACS Cent. Sci. 2017, 3, pp. 399–406.

7. Doris, S.E.; Ward, A.L.; Baskin, A.; Frischmann, P.D.; Gavvalapalli, N.; Chénard, E.; Sevov, C.S.; Prendergast, D.; Moore, J.S.; Helms, B.A. "Macromolecular Design Strategies for Preventing Active-Material Crossover in Non-Aqueous All-Organic Redox-Flow Batteries" Angew. Chem. Int. Ed. 2017, 56, pp. 1595–1599.

6. Doris, S.E.; Ward, A.L; Frischmann, P.D.; Li, L.; Helms, B.A. “Understanding and controlling the chemical evolution and polysulfide-blocking ability of lithium–sulfur battery membranes cast from polymers of intrinsic microporosity” J. Mater. Chem. A 2016, 4, pp. 16946–16952.

5. Gerber, L.C.H; Frischmann, P.D.; Fan, F.Y.; Doris, S.E.; Qu, X.; Scheuermann, A.M.; Persson, K.; Chiang, Y.-M.; Helms, B.A. “Three-Dimensional Growth of Li2S in Lithium-Sulfur Batteries Promoted by a Redox Mediator” Nano Lett. 2016, 16 (1), pp. 549–554.

4. Frischmann, P.D.; Gerber, L.C.H.; Doris, S.E.; Tsai, E.Y.; Fan, F.Y.; Qu, X.; Jain, A.; Persson, K.A.; Chiang, Y.-M.; Helms, B.A. “Supramolecular Perylene Bisimide-Polysulfide Gel Networks as Nanostructured Redox Mediators in Dissolved Polysulfide Lithium-Sulfur Batteries” Chem. Mater. 2015, 25 (19), pp. 6765–6770.

3. Li, C.; Ward, A.L.; Doris, S.E.; Pascal, T.A.; Prendergast, D.; Helms, B.A. “Polysulfide-Blocking Microporous Polymer Membrane Tailored for Hybrid Li-Sulfur Flow Batteries” Nano Lett. 2015, 15 (9), pp. 5724–5729.

2. Rosen, E.L.; Gilmore, K.; Sawvel, A.M.; Hammack, A.T.; Doris, S.E.; Aloni, S.; Altoe, V.; Nordlund, D.; Weng, T.-C.; Sokaras, D.; Cohen, B.E.; Urban, J.J.; Ogletree, D.F.; Milliron, D.J.; Prendergast, D.; Helms, B.A. “Chemically Directing d-Block Heterometallics to Nanocrystal Surfaces as Molecular Beacons of Surface Structure” Chem. Sci. 2015, 6, pp. 6295–6304.

1. Doris, S.E.; Lynch, J.J.; Li, C.; Wills, A.W.; Urban, J.J.; Helms, B.A. “Mechanistic Insight into the Formation of Cationic Naked Nanocrystals Generated under Equilibrium Control” J. Am. Chem. Soc. 2014, 136 (44), pp. 15702–15710.

Patents

4. Helms, B.A.; Doris, S.E.; Ward, A.L.; Frischmann, P.D.; Chenard, E.; Gavvalapalli, N.; Moore, J.S. "Redox-Flow Batteries Employing Oligomeric Organic Active Materials and Size-Selective Microporous Polymer Membranes" Patent Application US20170346104A1

3. Helms, B.A.; Frischmann, P.D.; Chiang, Y.-M.; Fan, F.Y.; Doris, S.E.; Gerber, L.C.H. "Redox mediators for metal sulfur batteries" Patent Application PCT/US2015/044637

2. Helms, B.A.; Li, C.; Ward, A.L.; Doris, S.E.; Frischmann, P.D. “Polymeric materials for electrochemical cells and ion separation processes” Patent Application PCT/US2016/025712

1. Helms, B.A.; Doris, S.E.; Li, C. “Ionic Nanocrystalline Materials with High Surface Charge Density and Composites of the Same” Patent Application 2015/0298988 A1

Presentations

8. Doris, S.E.; Pierre, A.; Street, R.A. "Controlling the Electrical Properties of Organic Electronics: a Path Towards Low-Power Printed Electronics " Talk given at: 2017 fall meeting of the Materials Research Society; 2017 Nov 26 – Dec 1; Boston, MA.

7. Doris, S.E.; Pierre, A.; Street, R.A. "Controlling the electrical properties of organic electronics with electrochemistry" Invited talk in the Electrical Engineering Seminar Series at UC Santa Cruz; 2017 Nov 6; Santa Cruz, CA.

6. Doris, S.E.; Ward, A.L.; Frischmann, P.D.; Helms, B.A. "Rational Design of Size-Selective Membranes for Next-Generation Electrochemical Energy Storage" Talk given at: 229th meeting of the Electrochemical Society; 2016 May 29 – June 3; San Diego, CA.

5. Doris, S.E.; Gerber, L.C.H.; Frischmann, P.D.; Fan, F.; Qu, X.; Scheuermann, A.M.; Persson, K.; Chiang, Y.-M.; Helms, B.A. "Redox Mediators Control Electrodeposition of Li2S in Lithium–Sulfur Batteries" Talk given at: 251st national meeting of the American Chemical Society; 2016 March 13 – 17; San Diego, CA. (invited to appear in Sci-Mix poster session)

4. Doris, S.E.; Ward, A.L.; Frischmann, P.D.; Helms, B.A. "Understanding Chemical Stability in Size-Selective Membranes Cast from Polymers of Intrinsic Microporosity" Talk given at: 251st national meeting of the American Chemical Society; 2016 March 13 – 17; San Diego, CA. (invited to appear in Sci-Mix poster session)

3. Doris, S.E.; Lynch, J.J.; Li, C.; Wills, A.W.; Urban, J.J.; Helms, B.A. “In Situ Analysis of the Formation of Cationic Naked Nanocrystals Generated under Equilibrium Control” Talk given at: 248th national meeting of the American Chemical Society; 2014 Aug 10 – 14; San Francisco, CA. (invited to appear in Sci-Mix poster session)

2. Doris, S.E.; Lynch, J.J.; Li, C.; Wills, A.W.; Urban, J.J.; Helms, B.A. “Naked Nanocrystal Inks for Solution-Processable Energy Devices” Talk given at: 2014 spring meeting of the Materials Research Society; 2014 April 21 – 25; San Francisco, CA.

1. Doris, S.E.; Helms, B.A. “A Building Block Approach to Architectured Mesoporous Battery Electrodes” Talk given to: Graduate Research Conference (UC Berkeley Chemistry Department, in fulfillment of qualifying examination requirements); 2013 Oct 3; Berkeley, CA.