Meet the editors

Prof. Dr. Sher Bahadar Khan received his PhD from HEJ, Karachi University, Pakistan. He then started his postdoctoral career in nanochemistry and nanotechnology and continued to work as a postdoctoral research fellow until February 2010 at Yonsei University, South Korea. In March 2010, he joined the Center for Advanced Materials and Nano-engineering, Department of Chemistry, Najran University, as an assistant professor and

continued his work until August 2011. He then joined the Chemistry Department, King Abdulaziz University, Jeddah, Saudi Arabia, as an assistant professor in September 2011. Currently, he is a full professor in the Chemistry Department, King Abdulaziz University, and is performing research in nanochemistry and nanotechnology. He was honored with the top scientist award of KP Science & Technology in 2018. He was also honored with the Deanship of Scientific Research award at King Abdulaziz University for book, patent, and highly ranked scientific publications. He is the author of 320 research articles, 12 books, and six patents with almost 1000 ± 10 impact factors, 6665 citations, and a 45 h-index.

Prof. Abdullah Mohamed Asiri received his PhD from the University of Wales, College of Cardiff, UK, in 1995. He has been Head of the Chemistry Department at King Abdulaziz University since October 2009 and is the Founder and Director of the Center of Excellence for Advanced Materials Research. He is also a professor of organic photochemistry. His research interest covers color chemistry, synthesis of novel photochromic and

thermochromic systems, synthesis of novel coloring matters and dyeing of textiles, materials chemistry, nanochemistry, nanotechnology, polymers, and plastics. He is the editor-in-chief of the King Abdulaziz University *Journal of Science* and is also a member of the editorial board of *Pigments and Resin Technology* (UK), *Organic Chemistry in Sight* (New Zealand), and *Recent Patents on Materials Science* (USA). He is the Vice-President of the Saudi Chemical Society (Western Province branch).

Dr. Kalsoom Akhtar received her PhD from the Chemistry Department, Ewha Women's University, Seoul, Korea. Dr. K. Akhtar is an assistant professor at the Chemistry Department, King Abdulaziz University, and is performing research in organic and nanochemistry, which comprises photocatalysis, organic synthesis, and metal oxide nanomaterials. She is the author of two books and 65 research papers.

Contents

*by Fatma Sarf*

Gas Sensors

Vapors Sensing

Gas Sensors

Gas Sensors

*and Balchandra Yadav*

Metal Oxide Gas Sensors by Nanostructures

*by Mostafa Barzegar Gerdroodbary*

*by Borwen You and Ja-Yu Lu*

**Preface III**

**Chapter 1 1**

**Chapter 2 19**

**Chapter 3 37**

**Chapter 4 57**

**Chapter 5 81**

**Chapter 6 101**

**Chapter 7 125**

Application of Knudsen Force for Development of Modern Micro

Optical Gas Sensors Using Terahertz Waves in the Layered Media

A Review on Preparation of ZnO Nanorods and Their Use in Ethanol

Design and Growth of Metal Oxide Film as Liquefied Petroleum

Synthesis of Metal Oxide Semiconductor Nanostructures for

*by Rakesh Kumar Sonker, Saroj Radheyshyam Shabajeet, Rahul Johari* 

*by Nazar Abbas Shah, Majeed Gul, Murrawat Abbas and Muhammad Amin*

*by Musarrat Jabeen, R. Vasant Kumar and Nisar Ali*

Gas Sensors Based on Conducting Polymers *by Nagy L. Torad and Mohamad M. Ayad*
