Ghenadii Korotcenkov, received his Ph.D. in Physics and Technology of Semiconductor Materials and Devices in 1976, and his Habilitate Degree (Dr.Sci.) in Physics and Mathematics of Semiconductors and Dielectrics in 1990. For a long time he was a leader of the scientific Gas Sensor Group and manager of various national and international scientific and engineering projects carried out in the Laboratory of Micro- and Optoelectronics, Technical University of Moldova. Currently, Dr. Korotcenkov is a research professor at the Gwangju Institute of Science and Technology, Republic of Korea.

　　Specialists from the former Soviet Union know Dr. Korotcenkov's research results in the field of study of Schottky barriers, MOS structures, native oxides, and photoreceivers based on Group IIIH-V compounds very well. His current research interests include materials science and surface science, focused on nanostructured metal oxides and solid-state gas sensor design. Dr. Korotcenkov is the author or editor of 11 books and special issues, 11 invited review papers, 17 book chapters, and more than 190 peer-reviewed articles. He holds 18 patents, and he has presented more than 200 reports at national and international conferences.

　　Dr. Korotcenkov's research activities have been honored by an Award of the Supreme Council of Science and Advanced Technology of the Republic of Moldova (2004), The Prize of the Presidents of the Ukrainian, Belarus, and Moldovan Academies of Sciences (2003), Senior Research Excellence Awards from the Technical University of Moldova (2001, 2003, 2005), a fellowship from the International Research Exchange Board (1998), and the National Youth Prize of the Republic of Moldova (1980), among others.

PREFACE

ABOUT THE EDITOR

CONTRIBUTORS

7 EXPERIMENTAL INVESTIGATIOX AND MODELING OF GAS-SENSING EFFECT

IN MIXED METAL OXIDE NANOCOMPOSITES

1 Introduction

2 Types of Mixed Metal Oxides

3 Synthesis of Metal Oxide Nanocomposites

4 Charge Transfer Processes and Conductivity

5 Conductivity Mechanism

6 Sensor Properties

7 Mechanism of Sensor Effect

7.1 Sensors Based on Single Nanofibers

7.2 Polycrystalline Sensors

8 Modeling of the Sensory Effect for Reduced Gases

8.1 Qualitative Discussion of the Sensory Mechanism

8.2 Equilibrium Electronic Characteristics Of SnO2

8.3 Sensor Response

9 Conclusions

Acknowledgment

References

8 THE INFLUENCE OF WATER VAPOR ON THE GAS-SENSING PHENOMENON

OF TIN DIOXIDE-BASED GAS SENSORS

1 Introduction

2 Direct Water Effects on Tin Dioxide-Based Gas Sensors

2.1 Undoped SnO2

2.2 Doped SnO2

3 Indirect Water Effects on Tin Dioxide-Based Gas Sensors

3.1 Reducing Gases

3.2 Oxidizing Gases

4 Phenomenological Model

5 Conclusions

Acknowledgments

References

9 COMPUTATIONAL DESIGN OF CHEMICAL NANOSENSORS:

TRANSITION METAL-DOPED SINGLE-WALLED CARBON NANOTUBES

1 Introduction

2 TM-Doped SWNTs as Nanosensors

3 Density Functional Theory

4 Kinetic Modeling

5 Nonequilibrium Green's Function Methodology

5.1 Divacancy II

5.2 Divacancy I

5.3 Monovacancy

5.4 Target and Background Molecules

6 Sensing Property

7 Conclusions

Acknowledgments

References

10 AL-DOPED GRAPHENE FOR ULTRASENSTIVE GAS DETECTION

11 PHYSICS-BASED MODELING OF SNO2 GAS SENSORS WITH FIELD-EFFECT TRANSISTOR STRUCTURE