Macromol. Mater. Eng. 5/2011

Ma, Jun; La, Ly Truc Bao; Zaman, Izzuddin; Meng, Qingshi; Luong, Lee; Ogilvie, Denise; Kuan, Hsu‐Chiang

doi:10.1002/mame.201190007

Cited by 11 publications

(15 citation statements)

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“…Since obvious toughness improvements were reported in previous nanoller-toughened epoxy resins, [25][26][27][28][29][30][31][32] we herein investigated the effect of interface on toughness and other mechanical properties. Fig.…”

Section: Nanocompositesmentioning

confidence: 99%

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Covalently bonded interfaces for polymer/graphene composites

et al. 2013

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The interface is well known for taking a critical role in the determination of the functional and mechanical properties of polymer composites. Previous interface research has focused on utilising reduced graphene oxide that is limited by a low structural integrity, which means a high fraction is needed to produce electrically conductive composites. By using 4,4 0 -diaminophenylsulfone, we in this study chemically modified high-structural integrity graphene platelets (GnPs) of 2-4 nm in thickness, covalently bondedGnPs with an epoxy matrix, and investigated the morphology and functional and mechanical performance of these composites. This covalently bonded interface prevented GnPs stacking in the matrix. In comparison with unmodified composites showing no reduction in electrical volume resistivity, the interface-modified composite at 0.489 vol% GnPs demonstrates an eight-order reduction in the resistivity, a 47.7% further improvement in modulus and 84.6% in fracture energy release rate.Comparison of GnPs with clay and multi-walled carbon nanotubes shows that our GnPs are more advantageous in terms of performance and cost. This study provides a novel method for developing interface-tuned polymer/graphene composites.

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Section: Nanocompositesmentioning

confidence: 99%

“…[25][26][27][28][29][30][31] However, this high ratio of GnPs would diminish or disappear if GnPs stack in the matrix. Only interface modication prevents GnPs stacking, and this is conrmed by the foregoing XRD and conductivity analysis.…”

Section: 25mentioning

confidence: 99%

Covalently bonded interfaces for polymer/graphene composites

et al. 2013

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“…Obviously, T g of neat resin for both systems increases with addition of GnPs, in line with many previous studies. 16,17,44,48 At 0.244 vol%, T g improves by 17.6% for the J230-cured system and 9.3% for the DDS-cured system. This was attributed to the large surface area of GnPs, which restricts the matrix molecules' vibration through the T g region, thus causing longer relaxation times for these crosslinked chains.…”

Section: 43mentioning

confidence: 99%

“…7a-f contain SEM micrographs of the fractured compact tension surface of the 0.984 vol% epoxy-GnP nanocomposite cured by DDS. Since the neat epoxy fracture surface is well known for being relatively smooth and mirror-like, 39,47,48 it is not included in this study. By contrast, the nanocomposite shows a typically rough fracture surface (Fig.…”

Section: 46mentioning

confidence: 99%

From carbon nanotubes and silicate layers to graphene platelets for polymer nanocomposites

et al. 2012

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In spite of extensive studies conducted on carbon nanotubes and silicate layers for their polymer-based nanocomposites, the rise of graphene now provides a more promising candidate due to its exceptionally high mechanical performance and electrical and thermal conductivities. The present study developed a facile approach to fabricate epoxy-graphene nanocomposites by thermally expanding a commercial product followed by ultrasonication and solution-compounding with epoxy, and investigated their morphologies, mechanical properties, electrical conductivity and thermal mechanical behaviour. Graphene platelets (GnPs) of 3.57 AE 0.50 nm in thickness were created after the expanded product was dispersed in tetrahydrofuran using 60 min ultrasonication. Since epoxy resins cured by various hardeners are widely used in industries, we chose two common hardeners: polyoxypropylene (J230) and 4,4 0 -diaminodiphenylsulfone (DDS). DDS-cured nanocomposites showed a better dispersion and exfoliation of GnPs, a higher improvement (573%) in fracture energy release rate and a lower percolation threshold (0.612 vol%) for electrical conductivity, because DDS contains benzene groups which create p-p interactions with GnPs promoting a higher degree of dispersion and exfoliation of GnPs during curing. This research pointed out a potential trend where GnPs would replace carbon nanotubes and silicate layers for many applications of polymer nanocomposites.

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“…This may results from the radial recombination of a photo generated hole with an electron that belongs to a singly ionized oxygen vacancy. 27,37 The intensity of both UV and green emissions increases with the Mn dopants in ZnO nanorods, mainly due to the increase of the carrier and defect concentration induced by Mn doping. Besides, the mismatch of the ionic radius of the Mn 2+ and Zn 2+ ions in crystallization caused by Mn doping is another reason for the rapid increase in exciton emission intensity.…”

Section: -7mentioning

confidence: 99%

Magnetic and optical properties of Mn-doped ZnO vertically aligned nanorods synthesized by hydrothermal technique

2016

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In this paper we have reported the synthesis of high quality vertically aligned undoped and Mn-doped ZnO single crystalline nanorods arrays on Si (100) substrates using two steps process, namely, initial slow seed layer formation followed by solution growth employing wet chemical hydrothermal method. The shapes of the as grown single crystalline nanorods are hexagonal. The diameter and length of the as grown undoped ZnO nanorods varies in the range of 80-150 nm and 1.0 - 1.4 μm, respectively. Along with the lattice parameters of the hexagonal crystal structure, the diameter and length of Mn doped ZnO nanorods are found to increase slightly as compared to the undoped ZnO nanorods. The X-ray photoelectron spectroscopy confirms the presence of Mn atoms in Mn2+ state in the single crystalline ZnO nanorods. The recorded photoluminescence spectrum contains two emissions peaks having UV exciton emissions along with a green-yellow emission. The green-yellow emissions provide the evidence of singly ionized oxygen vacancies. The magnetic field dependent magnetization measurements [M (H)] and zero field cooled (ZFC) and field cooled (FC) magnetization [M(T)] measurements have been carried out at different isothermal conditions in the temperature range of 5-300 K. The Mn doped ZnO nanorods clearly show room temperature ferromagnetic ordering near room temperature down to 5 K. The observed magnetization may be attributed to the long range ferromagnetic interaction between bound magnetic polarons led by singly charged oxygen vacancies.

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Macromol. Mater. Eng. 5/2011

Cited by 11 publications

References 0 publications

Covalently bonded interfaces for polymer/graphene composites

Covalently bonded interfaces for polymer/graphene composites

From carbon nanotubes and silicate layers to graphene platelets for polymer nanocomposites

Magnetic and optical properties of Mn-doped ZnO vertically aligned nanorods synthesized by hydrothermal technique

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