Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Layered, Tunable Graphene Oxide Heterostructures for Wearable
  Electrocardiogram Sensors   Nanoscale engineered materials combined with wireless technologies within
Internet of Things (IoT) can deliver new level of health diagnostics. A reduced
graphene oxide-nylon composite material is developed and tested, demonstrating
its usefulness as a materials for sensors in a wearable, long term
electrocardiogram (ECG) monitoring. The heterostructure is analyzed
structurally, chemically and electrically by scanning electron microscope
(SEM), atomic force microscopy (AFM), Fourier Transform Infrared (FTIR)
spectroscopy, and resistivity analysis. Analysis finds interesting tunability
of electrical and optical properties, while live ECG data demonstrate its
signal transduction capability and suitability as an ECG sensor.

16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph