Han Zhang received his B.S. degree from Wuhan University in 2006 and Ph.D. from Nanyang Technological University in 2010. He is currently working as a distinguished Professor and Director College of Physics and Optoelectronic Engineering Shenzhen University, Shenzhen 518060, China. His current research is on the ultrafast and nonlinear photonics of two-dimensional materials. He is currently the director of Shenzhen Key Laboratory of 2D Materials and Devices and Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, Shenzhen University.Nasir Mahmood Abbasi received his master’s degree in Chemistry from the University of Karachi, Pakistan, and PhD in Chemical Engineering with a focus in nanoscale materials (morphology and self-assembly of nanomaterial) from Zhejiang University, China in 2016. He worked as a postdoc fellow in the School of Physics and Optoelectronic Engineering at Shenzhen University from June 2019 to August 2021. After that worked as a scientist on a collaborative project in the Nanjing University Biomedical Engineering Department (Butch/Wang research group: https://butchresearch.com) and Research and Development unit of Nanjing Nuoyuan Medical Devices Company (October 2021 to October 2024). His research interests include heterostructures and the macroassemblies of nanoscale materials for their applications in energy, healthcare, and electronics.Muhammad Tayyab obtained his Ph.D. in Material Science and Engineering with a specialization in Magnetic Optoelectronic Materials from Nanjing Tech University,China in 2021, has continued to expand his research pursuits. After serving as a postdoctoral researcher from October 2023 to September 2025 at Nanjing Tech University, he has extended his expertise to Shenzhen University, China, where he currently holds a postdoctoral position. With a comprehensive background in energy generation, particularly focusing on triboelectric nanogenerators (TENGs) and piezoelectric nanogenerators (PENGs), and batteries as well as diverse interests encompassing sensors and actuators, optoelectronics,flexible electronics, and capacitors, Dr. Tayyab's contributions continue to drive advancements in sustainable energy solutions and advanced materials science. His dual postdoctoral experiences underscore his commitment to interdisciplinary research and collaborative exploration in academia.

• Chapter 1 An Overview of 2D Titanium-Based MXenes Chapter 2 Morphological Engineering of 2D Titanium-Based MXeneChapter 3 Defect Engineering/Physical Properties of Titanium-Based MXeneChapter 4 Application of Titanium-Based MXenes in Sensing, Photovoltaics, Catalysis, Energy Storage Devices, and BiomedicinesChapter 5 Composite Structures of 2D Titanium-Based MXenes with PolymersChapter 6 Mixed-Dimensional Heterostructures of Titanium-Based MXene with other 2D Layered MaterialsChapter 7 Mixed-Dimensional Titanium-Based MXene Heterostructures in Supercapacitors and Batteries-Based Energy Storage NetworkChapter 8 Mixed-Dimensional Titanium-Based Structures in Photovoltaics and CatalysisChapter 9 Preparation of 3D Assemblies/Structures of Titanium-Based MXenesChapter 10 Application of 3D Assemblies/Structures of Titanium-Based MXenes in Sensing, Photovoltaics, and CatalysisChapter 11 Summary and Future Directions