Author : Prof. J.V. YAKHMI
Homi Bhabha National Institute (HBNI), DAE
Mumbai, India,
(formerly at Bhabha Atomic Research Centre (BARC), Mumbai)
Homi Bhabha National Institute (HBNI), DAE
Mumbai, India,
(formerly at Bhabha Atomic Research Centre (BARC), Mumbai)
"Chemiresistive Gas Sensors from Nanostructured and Organic Materials"
ABSTRACT
In this talk, we describe efforts made in our labs at BARC to prepare functional nano-structured or molecular materials and their films towards fabrication of sensors. The materials chosen for use as selective sensors of toxic gases (H2S, Cl2, NO, NO2, NH3), are thin films of large band-gap oxide semiconductors, conducting polymers, MBE-grown metal-phthalocyanine (M-Pc) films, or molecular-oxide hybrid films for good selectivity and sensitivity. We shall primarily focus on the gas sensing characteristics (chemi-resistor effect) of the following three categories of materials:
(A) Inorganic Nano-structured Materials, viz. CuO-doped SnO2 films, Cu doped SnO2 nanowires, Au-incorporated WO3 films, Te nanotubes, ZnO nanobelts, ZnO-nanowires network modified by ultrathin CuO layers, Au-modified ZnO-nanowires, In2O3 whiskers, and Cr2O3 thin films.
(B) Molecular Materials engineered through self-assembly: Polycarbazole LB films, Au-modified Polycarbazole films, Polyaniline-microcrystals, MBE-grown Co-Pc and Cu-Pc films.
(C) Hybrids of Inorganic Nano-phases and Molecular materials: Composite Films of poly(3-hexylthiophene) and ZnO nanowires, and of ZnO-nanowires modified polypyrrole, p-polypyrrole/n-tungsten oxide hybrid nanocomposites, PANI–Ag nanocomposite flexible films, flexible Au-CoPc heterojunction films, and ZnO Nanowires-CoPc Heterojunction.
We shall also briefly discuss work conducted in our labs on immunosensors.
BIOGRAPHY
Prof. (Dr.) J.V. Yakhmi is a DAE Raja Ramanna Fellow at the Homi Bhabha National Institute - a Deemed University of DAE at Mumbai. During 2012-2015, he served as Chairman, Atomic Energy Education Society, Mumbai, which runs 30 Schools and Junior Colleges across India. He spent a research career of 45 years at Bhabha Atomic Research Centre, and at the time of his formal retirement in 2010, he was Associate Director of Physics Group and Head, Technical Physics & Prototype Engineering Division at BARC, and Adviser to the Chairman of Indian Atomic Energy Commission.
A 1975 Ph.D. in Condensed Matter Physics from Mumbai University, he has spent a large part of his career working on the broad areas of magnetism, superconductivity and soft matter. Under the subject are of soft matter, he has acquired special expertise in several areas, such as Molecular Magnets, Self-assembly, Polymers, Nano-phase materials, Surfactants, and Liquid Crystals. Besides, he established a program on the use of molecular materials for fabrication of Sensors, Bio-sensors, and Organic Electronic Devices at BARC. His current research interest, and recent publications are, in the subject of exotic Nb-nitroxide superconductors. He has published 380 papers in International journals and 60 Review articles in Journals/Books, and has a Google Scholar h-Index of 41. Besides, he has delivered 375 Invited Lectures of which 145 were in reputed International foreign labs, and 47 at International conferences.
He is a Fellow of National Academy of Sciences (India) and an elected Member of Asia Pacific Academy of Materials. He is a winner of the triennial MRS-ICSC Superconductivity and Materials Science Award (Senior) by Materials Research Society of India, Distinguished Alumni Award by Kurukshetra University, and the IIS Gold Medal by University of Tokyo.
Before retirement from BARC in 2010, he was Chairman of the Basic Sciences Committee of the Board of Research in Nuclear Sciences of DAE, and continues to serve as a Member of several Expert Advisory Committees of Government of India for research funding. He is also listed on the EC Experts Database.
In this talk, we describe efforts made in our labs at BARC to prepare functional nano-structured or molecular materials and their films towards fabrication of sensors. The materials chosen for use as selective sensors of toxic gases (H2S, Cl2, NO, NO2, NH3), are thin films of large band-gap oxide semiconductors, conducting polymers, MBE-grown metal-phthalocyanine (M-Pc) films, or molecular-oxide hybrid films for good selectivity and sensitivity. We shall primarily focus on the gas sensing characteristics (chemi-resistor effect) of the following three categories of materials:
(A) Inorganic Nano-structured Materials, viz. CuO-doped SnO2 films, Cu doped SnO2 nanowires, Au-incorporated WO3 films, Te nanotubes, ZnO nanobelts, ZnO-nanowires network modified by ultrathin CuO layers, Au-modified ZnO-nanowires, In2O3 whiskers, and Cr2O3 thin films.
(B) Molecular Materials engineered through self-assembly: Polycarbazole LB films, Au-modified Polycarbazole films, Polyaniline-microcrystals, MBE-grown Co-Pc and Cu-Pc films.
(C) Hybrids of Inorganic Nano-phases and Molecular materials: Composite Films of poly(3-hexylthiophene) and ZnO nanowires, and of ZnO-nanowires modified polypyrrole, p-polypyrrole/n-tungsten oxide hybrid nanocomposites, PANI–Ag nanocomposite flexible films, flexible Au-CoPc heterojunction films, and ZnO Nanowires-CoPc Heterojunction.
We shall also briefly discuss work conducted in our labs on immunosensors.
BIOGRAPHY
Prof. (Dr.) J.V. Yakhmi is a DAE Raja Ramanna Fellow at the Homi Bhabha National Institute - a Deemed University of DAE at Mumbai. During 2012-2015, he served as Chairman, Atomic Energy Education Society, Mumbai, which runs 30 Schools and Junior Colleges across India. He spent a research career of 45 years at Bhabha Atomic Research Centre, and at the time of his formal retirement in 2010, he was Associate Director of Physics Group and Head, Technical Physics & Prototype Engineering Division at BARC, and Adviser to the Chairman of Indian Atomic Energy Commission.
A 1975 Ph.D. in Condensed Matter Physics from Mumbai University, he has spent a large part of his career working on the broad areas of magnetism, superconductivity and soft matter. Under the subject are of soft matter, he has acquired special expertise in several areas, such as Molecular Magnets, Self-assembly, Polymers, Nano-phase materials, Surfactants, and Liquid Crystals. Besides, he established a program on the use of molecular materials for fabrication of Sensors, Bio-sensors, and Organic Electronic Devices at BARC. His current research interest, and recent publications are, in the subject of exotic Nb-nitroxide superconductors. He has published 380 papers in International journals and 60 Review articles in Journals/Books, and has a Google Scholar h-Index of 41. Besides, he has delivered 375 Invited Lectures of which 145 were in reputed International foreign labs, and 47 at International conferences.
He is a Fellow of National Academy of Sciences (India) and an elected Member of Asia Pacific Academy of Materials. He is a winner of the triennial MRS-ICSC Superconductivity and Materials Science Award (Senior) by Materials Research Society of India, Distinguished Alumni Award by Kurukshetra University, and the IIS Gold Medal by University of Tokyo.
Before retirement from BARC in 2010, he was Chairman of the Basic Sciences Committee of the Board of Research in Nuclear Sciences of DAE, and continues to serve as a Member of several Expert Advisory Committees of Government of India for research funding. He is also listed on the EC Experts Database.