Fabrication and Characterization of Amino Group Functionalized Multiwall Carbon Nanotubes (MWCNT) Formaldehyde Gas Sensors

Synthesis and characterization carboxyl functionalized Multi-Walled Carbon Nanotubes (MWCNT-COOH) and NH2 functionalized Multi-Walled Carbon Nanotubes (MWCNTNH2)

“…In this experiment, a multiwalled carbon nanotubes (MWCNTs) functionality process with an amino group (MWCNTs-NH 2 ) was performed under one reaction. Some of the NH 2 group functionalization procedures in MWCNTs, carried out by some researchers, are using AlCl 2 and CHCl 2 [13], using SOCl 2 [24] or variations between HNO 3 and SOCl 2 [16] as shown on figure 2 and figure 3. Shen et.al studied the functionalization of MWCNTs with amino groups carried out through the experimental steps, ie carboxylation (MWCNTs), acylation (MWCNTs-COOH) and amidation (MWCNTs-NH 2 ) [25].…”

“…Some forms of CNTs that are often used as feedstocks for the manufacture of nano sensors consist of 2, namely Singlewall Carbon Nanotubes (SWCNT) [2][3][4][5][6] and Multiwall Carbon Nanotubes (MWCNTs) [7][8][9][10][11][12][13][14][15][16][17]. The use of these nano sensors also varies, some nano sensors are used for the detection of microbial contaminants [18], gas detection such as hydrogen [1,19], air humidity [7,9,20], formalin [2,16,21,22,23].Nanomaterials have a high surface area so that if used as a sensor will have a better response.However, the nanotubes in the CNT material have not been able to respond well if they have not been activated by breaking the carbon bonds on the tube wall and attached to the amino group as material functionalization so it is easy to interact with the gas.…”

“…The use of these nano sensors also varies, some nano sensors are used for the detection of microbial contaminants [18], gas detection such as hydrogen [1,19], air humidity [7,9,20], formalin [2,16,21,22,23].Nanomaterials have a high surface area so that if used as a sensor will have a better response.However, the nanotubes in the CNT material have not been able to respond well if they have not been activated by breaking the carbon bonds on the tube wall and attached to the amino group as material functionalization so it is easy to interact with the gas. Although thismaterial provide safe detection of gas, it still have some limitations and challenges such as low relative resistance changes and selectivity, long-term instability and so on.…”

Micro-Electromechanical Acoustic Resonator Coated with Polyethyleneimine Nanofibers for the Detection of Formaldehyde Vapor

“…The solution leads to the development of smart formaldehyde sensors with small device size and rapid response speed. So far, metal oxide semiconductor (MOS) [ 3 , 4 , 5 ], carbon nanotubes (CNTs) [ 6 , 7 , 8 ], conductive polymer [ 9 ] have been used to fabricate formaldehyde sensors based on field effect, resistive and electroacoustic principles. Over the past decade, the technical progress in micro-electromechanical systems (MEMS) brings a novel development direction for the microsensors.…”

Acoustic Sensors Based on Amino-Functionalized Nanoparticles to Detect Volatile Organic Solvents

“…Moreover, nanoparticle surface can be improved by incorporating organic groups to its nanostructure, in order to obtain a higher affinity with defined gases. In this work surface-functionalized nanoparticles are proposed as high efficiency sensing layers for a Love-wave sensor, choosing amino-functionalized iron oxide nanoparticles because the amino group has a high reactivity, is a rich source of chemistry and can react with many chemicals with different intensity [ 23 , 24 , 25 , 26 ]. Different solvents used in the industry have been measured due to the good results obtained sensing N,N-dimethylformamide [ 26 ].…”