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Title: Vapor-Phase-Gating-Induced Ultrasensitive Ion Detection in Graphene and Single-Walled Carbon Nanotube Networks

Journal Article · · Advanced Materials
 [1];  [2];  [3]; ORCiD logo [4];  [1];  [1]; ORCiD logo [5]
  1. Northeastern Univ., Boston, MA (United States)
  2. Northeastern Univ., Boston, MA (United States); Villanova University, PA (United States)
  3. Northeastern Univ., Boston, MA (United States); Gyeongnam National University of Science and Technology, Jinju‐Si (South Korea)
  4. Northeastern Univ., Boston, MA (United States) ; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Northeastern Univ., Boston, MA (United States) ; University of Electronic Science and Technology of China, Chengdu, Sichuan (China)

Designing ultrasensitive detectors often requires complex architectures, high-voltage operations, and sophisticated low-noise measurements. Here, it is shown that simple low-bias two-terminal DC-conductance values of graphene and single-walled carbon nanotubes are extremely sensitive to ionized gas molecules. Incident ions form an electrode-free, dielectric- or electrolyte-free, bias-free vapor-phase top-gate that can efficiently modulate carrier densities up to ≈0.6 × 1013 cm-2. Surprisingly, the resulting current changes are several orders of magnitude larger than that expected from conventional electrostatic gating, suggesting the possible role of a current-gain inducing mechanism similar to those seen in photodetectors. These miniature detectors demonstrate charge–current amplification factor values exceeding 108 A C-1 in vacuum with undiminished responses in open air, and clearly distinguish between positive and negative ions sources. At extremely low rates of ion incidence, detector currents show stepwise changes with time, and calculations suggest that these stepwise changes can result from arrival of individual ions. Lastly, these sensitive ion detectors are used to demonstrate a proof-of-concept low-cost, amplifier-free, light-emitting-diode-based low-power ion-indicator.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1481992
Report Number(s):
LA-UR-18-21107
Journal Information:
Advanced Materials, Vol. 29, Issue 23; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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