**3. Improved carbon nanocomposites**

In various fields of technology such as medical, sensors, computing etc. materials play important role for our comfort. The use of new materials with enhanced properties is a critical need due to demand for betterment. High-performance nanocomposites are recommended for industrial use like energy storage, damage sensing, aerospace and automobiles but have some limitations. The discovery of carbon-based nanofillers plays a vital role to overcome these limitations [29]. Combination of CNTs and Graphene extensively improves the properties of nanocomposites. CNTs and graphene are considered significant nanofillers to formulate advanced nanocomposites due to their several possible applications. At nanoscale, carbon nanotubes and graphene nanoplatelets (GnP) materials suggest an exclusive combination of elastic modulus (0.8–3 Tpa), thermal conductivity (3000–6000 W/m-K), and electrical resistivity (3–20 μΩ-cm) [30–33]. Some researchers have processed nanocomposites in the range of 0.2–5 weight % of CNTs into various polymer matrix materials [34]. These nanocomposites revealed 10–35% enhancement in properties such as modulus, strength, impact resistance, thermal conductivity, and electrical conductivity, compared to the matrix polymer.

#### **3.1 Carbon nanotubes-based nanocomposites**

Carbon nanotubes have been deemed as versatile building blocks to create a novel generation of nanocomposites desired for a variety of commercial applications.
