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HCM UNIVERSITY OF TECHNICAL EDUCATION FACULTY OF CHEMICAL AND FOOD TECHNOLOGY CHEMICAL ENGINEERING TECHNOLOGY SUBJECT : Fundamentals of Design Chemical Machines and Factories SUBJECTION 13: CARBON NANOMATERIALS-BASED GAS SENSOR Introductor: TS Lý Tấn Nhiệm MEMBERS OF TEAM Trần Thanh Huy -19128002 Huỳnh Thị Yến Ly-19128048 MEMBERS OF TEAM Nguyễn Bình Đẵng- 19128027 Nguyễn Văn Tân- 19128069 Nguyễn Thanh Vinh- 19128101 CONTENTS OF PRESENTATION 01 03 APPLIC W Application of gas sensors in Summary about the gas sensor life in nanocarbone INTRODUCTION Concept of the gas base sensor CONS 04 02 REVIE Outstanding research methods ATION LUSIO N INTRODUCTION 1.INTRODUCTION Basic criteria for good and efficient gas sensing systems: (i) high sensitivity and selectivity;  (ii) fast response time and recovery time; (iii)low analyst consumption; (iv) low operating temperature and temperature independence; (v) stability in performances 1.INTRODUCTION - The recent development of nanotechnology has created a huge potential to build highly sensitive, low-cost, portable sensors with low power consumption The extremely high surface-to-volume ratio and hollow structure of nanomaterials are ideal for gas molecules adsorption and storage  Therefore, gas sensors based on nanomaterials, such as carbon nanotubes (CNTs) have been investigated widely - Carbon nanotubes (CNTs) since been firstly discovered by Iijima • In:+ 1991- MWCNT       + 1993 – SWCNT Fig2 Descriptive structure of SWCNT and MWCNT 1.INTRODUCTION As seeing accouterments, SWCNTs and MWCNTs bear as p-type semiconductors In fact, trials have shown that NH3 donates about 0.04 electrons per patch to SWNTs,[14 ] while NO2 withdraws approxi-mately 0.1 electron per patch with a binding energy of 0.8 eV.[15 ] Fig3.1 Graphite structure made by graphene Fig3.2 Describe how to roll graphene to form CNTs 1.INTRODUCTION Transistor and chemfet diagrams Transistor Chemfet 10 CNT chemiresistor Chemical gas sensors are made simply by incorporating excellent sensing nanomaterials onto a substrate with electrode plating, and their sensing mechanism is based on the change in electrical resistance of the device caused by the interaction between the target gas and the nanomaterials   S = ×100% The resistance of the gas sensors to target gas and air, respectively, is represented by Rg and R0 Fig Chemical resistance-type gas sensors 11 1.INTRODUCTION Fig7 Electrical schematics of a CHEMIRESISTOR  and CHEMFET platform 13 Table Comparison between resistive-type gas sensors and FET based H2 gas sensors Sensor type Response time Detection limit, ppm Sensitivity, % Temperature, °C Ref Resistive-type 2-7 15-100 2-14 RT [55  -57]  FET-type 10s-2 5-10 50-85 50-300 [58  -60]  RT is room temperature 2.REVIEW H2 Gas Sensor By using aerosol-ray printing base in Pt nanos NH3 Gas Sensor Using reactive ion etching (RIE) and thermal CVD method NH3 gas sensor on polimer Polimer (m aminobenzen Sunfunic acid) 15 2.1 GENERAL PRINCIPLE OF PAINTING NANOPARTICLES INTO NANOCARBONES Step Step Step Step The gas sensor which is in Preparation of carbon nanotubes • SWCNT • MWCNT SCNTs thin films were Coating different types of meal nano into CNTs deposited on Si substrate by the form of field-effect transistors (FETs) CDV method Figure 2: Brief summary of the process of creating gas sensors on CNTs is added metal Nanos 16 2.1 Comparison of H2 gas sensors on Nanocarbone 2.1 R O S N E S S A H2 G 17 ●2.1 By using Aerosol-ray Printing CONTENTS  CNTs metal of nano Pt hybrids  Material : SWCNT film  Sensitivity: 4% ( 20ppm )  It’s fabricated using aerosol-ray printing, and then decorated with nano Pt 18 The SWCNT powder was first treated with acidwas first treated with acid Thin film gas sensors were coated on Si Eliminate the catalysts and The purrified SWCNT power was carbonaceous impurities dispersed in solution of EG and SDS Implement with reduced reaction to H2PtCl6·H2O was added into the obtain hybrid Pt-SWCNT mixture Substrates with the ink Picture : Processing of creating H2 gas sensor base on nanocacbon basis by an aerosol jet printing method 19 2.2 Comparison of NH3 gas sensors on Nanocarbone 2.2 R O S N E S S A NH3 G 20 2.2 By using (RIE) and thermal CVD method MATERIAL SENSITIVITY SWCNTs network decorated with anatase [Nh3] =10 ppm OPTIMAL TEMPERTURE 190 C TiO2 21 22 2.3 Comparison of Nh3 gas sensors on CNTs/Polymer Sensors Some conducting polymers can bear like semiconductors   This effect is believed to be caused by the charge transfer between gas motes and the polymer or the polymer film’s lump   There are volumetric changes of the matrix polymer can be formed “ percolation threshold”.  CNTs/Polymer Sensors   The conductive polymers have been used to functionalize CNTs   The PANI-SWCNT network based gas sensors were highly sensitive to NH3, higher than SWCNTs by more than 60 times   A similar sensor based on poly(m-aminobenzene sulfonic acid)   Figure 3: The simple diagram depicting about  CNTs/Polymer Composites Gas Sensors 23 APPLICATION Household appliances Microware oven equipment, Medical devices Heart rate gauge, ultrasound machine Installed in enclosed houses for agricultural production heating oven, air conditioner Factory Automobile production Detecting gas leaks to promptly handle Agriculture Automobile engines and equipment Sensor Material Solar panels, biomedical materials, incidents 25 Conslution Summary of gas sensors 26 References Shen, Y., Yamazaki, T., Liu, Z., et al.: ‘Hydrogen sensing properties of Pd-doped SnO2 sputtered films with columnar nanostructures’, Thin Solid Films, 2009, 517, (21), pp 6119–6123 Zhang, D., Wang, D., Zong, X., et al.: ‘High-performance QCM humidity sensor based on graphene oxide/tin oxide/polyaniline ternary nanocomposite prepared by in-situ oxidative polymerization method’, Sens Actuators B, Chem., 2018, 262, pp 531–541 Zhang, D., Wang, D., Zong, X., et al.: ‘High-performance QCM humidity sensor based on graphene oxide/tin 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