DC electrical conductivity retention and thermo-optical studies of camphor sulfonic acid doped cetyl tri methyl ammonium bromide-assisted graphene/polyaniline composite nanofibers

Hasan, Mudassir,Hossain, Muhammad Mohsin,Lee, Moonyong Elsevier 2015 Journal of industrial and engineering chemistry Vol.32 No.-

<P><B>Abstract</B></P> <P>This paper reports the synthesis of camphor sulfonic acid (CSA) doped PANI/GN composite nanofibers by the <I>in situ</I> chemical oxidative polymerization of aniline in the presence of cationic surfactant cetyl tri methyl ammonium bromide (CTAB). The as-synthesized composite nanofibers were examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, UV–vis diffused reflectance spectroscopy, and thermogravimetric analysis. The CSA-doped PANI/GN composite nanofibers showed higher DC electrical conductivity than PANI, which was attributed to the enhanced mobility of the charge carriers after the incorporation of GN into the PANI/GN composite nanofibers. The PANI/GN composite nanofibers also showed improved DC electrical conductivity retention at 413K, which might be due to the synergistic effects of GN and PANI in the composite structure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CSA doped PANI/GN composite nanofibers has been prepared under CTAB. </LI> <LI> Electrical conductivity retention was found to be more in case of PANI/GN compared to PANI. </LI> <LI> Conductivity was improved in case of PANI/GN composite nanofibers. </LI> </UL> </P>

DC electrical conductivity retention and thermo-optical studies of camphor sulfonic acid doped cetyl tri methyl ammonium bromide-assisted graphene/polyaniline composite nanofibers

Mudassir Hasan,Muhammad Mohsin Hossain,이문용 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-

This paper reports the synthesis of camphor sulfonic acid (CSA) doped PANI/GN composite nanofibers bythe in situ chemical oxidative polymerization of aniline in the presence of cationic surfactant cetyl trimethyl ammonium bromide (CTAB). The as-synthesized composite nanofibers were examined by scanningelectron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, UV–visdiffused reflectance spectroscopy, and thermogravimetric analysis. The CSA-doped PANI/GN compositenanofibers showed higher DC electrical conductivity than PANI, which was attributed to the enhancedmobility of the charge carriers after the incorporation of GN into the PANI/GN composite nanofibers. ThePANI/GN composite nanofibers also showed improved DC electrical conductivity retention at 413 K, whichmight be due to the synergistic effects of GN and PANI in the composite structure.

Electrical Conductivity, Optical Property and Ammonia Sensing Studies on HCl Doped Au@Polyaniline Nanocomposites

Mudassir Hasan,모드안사리,조무환,이문용 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1

This paper reports the synthesis of HCl-doped Au@polyaniline(Pani) nanocomposite fibers by the in situ oxidative polymerizationof aniline in the presence of gold nanoparticles. Thusprepared nanocomposite fibers were characterized by SEM,TEM, XRD, Raman spectroscopy, XPS, UV-visible diffusedreflectance spectroscopy, TGA, and DSC. The Au@Paninanocomposite fibers showed superior DC electrical conductivityto HCl-doped Pani, which might be due to the increasedmobility of the charge carriers after the incorporation of goldnanoparticle in Pani. Au@Pani also exhibited a better ammoniasensing and recovery response than Pani, which might bedue to the increase in the surface area of Pani after the incorporationof gold nanoparticles.

IMC-PID controller tuning from closed-loop setpoint response

Mudassir Hasan,M. Shamsuzzoha,Moonyong Lee 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

The proposed IMC-PID tuning method is extension of the recently published setpoint overshoot method (2010). It is one step procedure to obtain the PI/PID setting which gives the better performance and robustness. The method requires one closed-loop step setpoint response experiment using a proportional only controller with gain Kc0. Based on simulations for a range of first-order with delay processes, simple correlations have been derived to give PI/PID.filter controller settings. The controller gain (Kc/Kc0) is only a function of the overshoot observed in the setpoint experiment. The controller integral and derivative time (τI and τD) is mainly a function of the time to reach the first peak (tp). The proposed tuning method shows better performance than the setpoint overshoot method (2010) for broad range of processes.

Enhanced thermo-optical performance and high BET surface area of graphene@PVC nanocomposite fibers prepared by simple facile deposition technique: N2 adsorption study

Mudassir Hasan,Arghya Narayan Banerjee,이문용 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

GN@PVC nanocomposite fiber was synthesized by simple facile deposition technique using THF as asolvent. The as-prepared GN@PVC nanocomposite fibers were characterized by BET, Raman, XPS, XRD,TEM, TGA, DRS and SEM. BET analysis of GN@PVC showed 70% enhancement in the surface area over PVCfibers. The thermal stability of GN@PVC nanocomposite fibers was found to be highly dependent on theweight percent of GN and nanocomposite with 3 wt.% GN showed 8% increase in glass transitiontemperature and 36% improvement in the activation energy for thermal degradation. Moreover,GN@PVC nanocomposite fibers showed lower band gap in comparison to PVC.

Enhanced thermo-optical performance and high BET surface area of graphene@PVC nanocomposite fibers prepared by simple facile deposition technique: N₂ adsorption study

Hasan, Mudassir,Banerjee, Arghya Narayan,Lee, Moonyong Elsevier 2015 Journal of industrial and engineering chemistry Vol.21 No.-

<P><B>Abstract</B></P> <P>GN@PVC nanocomposite fiber was synthesized by simple facile deposition technique using THF as a solvent. The as-prepared GN@PVC nanocomposite fibers were characterized by BET, Raman, XPS, XRD, TEM, TGA, DRS and SEM. BET analysis of GN@PVC showed 70% enhancement in the surface area over PVC fibers. The thermal stability of GN@PVC nanocomposite fibers was found to be highly dependent on the weight percent of GN and nanocomposite with 3wt.% GN showed 8% increase in glass transition temperature and 36% improvement in the activation energy for thermal degradation. Moreover, GN@PVC nanocomposite fibers showed lower band gap in comparison to PVC.</P> <P><B>Highlights</B></P> <P> <UL> <LI> GN@PVC nanocomposite fibers were prepared by simple facile deposition technique. </LI> <LI> N<SUB>2</SUB> adsorption isotherm showed high BET surface area for the nanocomposite fibers. </LI> <LI> Significantly enhanced glass transition temperature and activation energy were observed. </LI> </UL> </P>

Ammonia sensing and DC electrical conductivity studies of p-toluene sulfonic acid doped cetyltrimethylammonium bromide assisted V2O5@polyaniline composite nanofibers

Mudassir Hasan,모드안사리,조무환,이문용 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-

polymerization of aniline in the presence of V2O5 and cetyltrimethylammonium bromide, as a surfactant. The prepared composite nanofibers were characterized by scanning electron microscopy, transmissionelectron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV–visible diffused reflectance spectroscopy, thermogravimetric analysis, and differential scanningcalorimetry. The V2O5@Pani composite nanofibers showed higher DC electrical conductivity than Pani,which might be due to the increased mobility of the charge carriers after the incorporation of V2O5. V2O5@Pani also showed a better ammonia sensing and recovery response than Pani due to thesynergistic effect of V2O5 and Pani.

Exploration of highly active bidentate ligands for iron (III)-catalyzed ATRP

Khan, Mohd Yusuf,Zhou, Jun,Chen, Xiangxiong,Khan, Abuzar,Mudassir, Hasan,Xue, Zhigang,Lee, Seung Woo,Noh, Seok Kyun Elsevier 2016 Polymer Vol.90 No.-

<P><B>Abstract</B></P> <P>Novel highly active substituted P-N ligands were found to be remarkably efficient for the atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) and butyl methacrylate (BMA). The reaction was catalyzed by a high oxidation state metal (FeX<SUB>3</SUB>) coupled with ethyl-2-bromoisobutyrate (EBriB) as an ATRP initiator. MMA polymerization was examined by the gradual addition of FeX<SUB>3</SUB> and the complete transformation of uncontrolled ATRP (PDI∼1.59) to a controlled polymerization system (PDI∼1.13) was observed. The polymerizations were well controlled with a linear increase in the mean molecular weight (<I>M</I> <SUB> <I>n</I> </SUB>) and monomer conversion reached up to 90% without complications. In the case of the DTBP ligand, the experimental molecular weights matched the theoretical values well and the PDIs were narrower (<1.2) compared to the other ligands. Furthermore, the potentially active catalyst (FeBr<SUB>3</SUB>/DTBP) was used successfully for the polymerization of MMA at a 50-ppm catalyst loading. The probable mechanism using FeX<SUB>3</SUB> without an external additive was also determined.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Uncontrolled polymerization system can be entirely changed to controlled system simply replacing Fe(II)X<SUB>2</SUB> by Fe(III)X<SUB>3</SUB> without any external additive. </LI> <LI> Active catalysts [Fe(III)X<SUB>3</SUB>] with new bidentate (N-P) ligands were explored for the polymerization of MMA, BMA and Styrene with ppm level of catalyst maintaining living character of polymer. </LI> <LI> In situ reduction of Fe(III) to Fe(II) was observed by P-N ligand mainly which was analyzed by UV/vis/NIR spectroscopy respectively. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Three different hetero-chelate ligands possessing nitrogen (-N) and phosphorus (-P) were examined for iron-mediated ATRP of MMA, BMA and styrene. The kinetic studies showed ATRP trend during polymerization. Polymerizations using lower oxidation state metal (FeX<SUB>2</SUB>) showed uncontrolled behavior (like high molecular weight distribution ∼1.58 and constant molecular weight after 50% monomer conversion). However, complete transformation of uncontrolled to controlled polymerization was noticed while introducing deactivator (FeX<SUB>3</SUB>) to the polymerization system and best-controlled results found by employing (FeX<SUB>3</SUB>) only. The results obtained were compared and a probable mechanism was proposed.</P> <P>[DISPLAY OMISSION]</P>

Synergetic Effect in Raman Scattering of ZnO Nanoparticles in ZnO–CNT Fibers: A Way To Enhance the G and 2D Band

Hossain, Muhammad Mohsin,Shima, Hossain,Islam, Md. Akherul,Hasan, Mudassir,Lee, Moonyong American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.31

<P>Semiconducting ZnO was used as a surface enhanced Raman scattering (SERS) substrate without needing to combine it with novel metal particles. An interesting synergistic effect in the Raman scattering of ZnO nanoparticles and CNTs was observed due to the vibrational force of Zn and O atoms in the Zn-O system of ZnO nanoparticles and the special deformation of CNTs in the SERS fiber. The convenient deformation of CNTs allowed a large number of carbon atoms in the planar direction, such as a graphene sheet, and facilitated the planar vibrations of sp(2) carbon atoms, leading to a considerable increase in the G and 2D band intensity. A new radial breathing mode (RBM) peak was activated by the radial polarization of CNTs through the vibration force of Zn and O atoms in the Zn-O system in its radial direction. The cross-section cutting 3D image of the SERS fiber revealed the CNTs to be rearranged geometrically in the SERS fiber and formed a bunched structure because of the enhanced interactions among the individual CNTs via ZnO nanoparticles. This highlights a new dimension of research into ZnO nanomaterials and CNTs in SERS fibers and provides new insights into ZnO-CNT fiber composites.</P>

Alignment of Carbon Nanotubes in Carbon Nanotube Fibers Through Nanoparticles: A Route for Controlling Mechanical and Electrical Properties

Hossain, Muhammad Mohsin,Islam, Md. Akherul,Shima, Hossain,Hasan, Mudassir,Lee, Moonyong American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.6

<P>This is the first study that describes how semiconducting ZnO can act as an alignment agent in carbon nanotubes (CNTs) fibers. Because of the alignment of CNTs through the ZnO nanoparticles linking groups, the CNTs inside the fibers were equally distributed by the attraction of bonding forces into sheetlike bunches, such that any applied mechanical breaking load was equally distributed to each CNT inside the fiber, making them mechanically robust against breaking loads. Although semiconductive ZnO nanoparticles were used here, the electrical conductivity of the aligned CNT fiber was comparable to bare CNT fibers, suggesting that the total electron movement through the CNTs inside the aligned CNT fiber is not disrupted by the insulating behavior of ZnO nanoparticles. A high degree of control over the electrical conductivity was also demonstrated by the ZnO nanoparticles, working as electron movement bridges between CNTs in the longitudinal and crosswise directions. Well-organized surface interface chemistry was also observed, which supports the notion of CNT alignment inside the fibers. This research represents a new area of surface interface chemistry for interfacially linked CNTs and ZnO nanomaterials with improved mechanical properties and electrical conductivity within aligned CNT fibers.</P>