MOSFET	Metal-oxide-semiconductor field effect transistors
SPR	Surface plasmon resonance
rGO	Reduced graphene oxide
CNTs	Carbon nanotubes
2D	Two-dimensional
3D	Three-dimensional
TMDCs	Transition metal dichalcogenides
MOx	Metal oxides
VOCs	Volatile organic compounds
e-noses	Electronic noses
FFT	Fast Fourier transform
CWT	Continuous wavelet transform
DWT	Discrete wavelet transform
PCA	Principal component analysis
LDA	Linear discriminant analysis
KNN	k-nearest neighbors
CART	Classification and regression trees
NB	Gaussian naïve Bayes
SVM	Support vector machines
RF	Random forest
DFT	Density function theory
DOS	Density of state
VSCs	Volatile sulfur compounds
LOD	Limit of detection
LPWN	Low-power wireless network
M2M	Machine to machine
LR	Logistic regression
Rair	Sensor resistance in air
Rgas	Sensor resistance after gas exposure
ΔR	Difference between Rair and Rgas
AResp	Area under response time curve
ARecov	Area under recovery time curve
Cavitand	A container shaped molecule with a cavity
Tsfresh	A tool for feature extraction
FETs	Field effect transistors
CV	Cross-validation
ANN	Artificial neural networks
DFA	Discriminant factor analysis
MEMS	Micro-electromechanical systems
NEMS	Nano-electromechanical systems