This book covers the various aspects of MXenes nanomaterials and its composites from the fabrication to the potential applications in energy devices, sensors, and environmental remediation. MXenes are two-dimensional (2D) transition metal carbides and nitrides which contains novel combination of properties including great conductivity and mechanical, thermal features of transition metal carbide and nitrides. In addition, MXenes nanomaterials possess high surface area, novel morphology, and layered structure and the functionalized of its surfaces gives it excellent hydrophilic characteristics and high absorption of electromagnetic radiations making them versatile materials for various applications. The beginning part of the book gives an in-depth literature covering the fundamental principles, fabrication, self-assembling strategies of nano-engineered MXenes, and their composites materials. The later chapters describe the chemical functionalization of MXenes nanomaterials for diversified applications such as electromagnetic shielding, energy storage devices (super capacitors, lithium ion batteries, CO2 capture, optical switching, transistors), photo catalysis, drug delivery, implants, tissue engineering, water purification, and sensing applications. It demonstrates that MXene-based advanced architectures promote continuous innovations and provide driving force in different fields particularly in environmental remediation and energy storage devices. This book is essential reading for all chemists, biologists, physicists, and environmental scientists working in the field of nanotechnology, energy, and environmental chemistry. It helps academics and professionals to polish their knowledge with the latest described data. It also helps professionals in developing innovative technologies by keeping in mind the applications of functionalized nanostructured MXenes.