Investigation of mechanical properties of graphene decorated with graphene quantum dot‐reinforced epoxy nanocomposite

Abstract

In this investigation, the mechanical properties such as compression, impact, and flexural properties of graphene decorated with graphene quantum dots (GDGQD) epoxy composites with concentration of GDGQD ranging from 0.25 to 1 wt % were studied. Ideal mechanical properties are obtained by systematically varying the filler weight in the epoxy matrix. The morphological studies of GDGQD have been characterized using transmission electron microscope, X-ray diffraction, and Fourier transform infrared technique. The compression, impact, and flexural strengths were enhanced effectively by the GDGQD loading. With the addition of 0.75 wt % of GDGQD, the compressive strength, compressive modulus, flexural strength, and flexural modulus of the composites were improved by 22, 29, 31, and 63%, respectively. Also an improvement in impact strength of 102% for 0.75 wt % GDGQD epoxy sample was also obtained. Examination of fractured test specimens was performed with scanning electron microscope. The enhancement in the mechanical properties is due to the better stress transfer that is attributed by enhanced interfacial bonding between GDGQDs and the epoxy. Using the GDGQD aspect ratio in the two-dimensional randomly oriented filler modified Halpin-Tsai model, the theoretical flexural modulus for the GDGQD/epoxy composites has been established.

Investigation of physical, flexural, and dynamic mechanical properties of alumina and graphene nanoplatelets filled epoxy nanocomposites

“…[9,10] Inclusions of micro-fillers and nano-fillers have been proved to be a capable technique for improving the mechanical, thermal, and additional functional properties of epoxy composites. The most commonly used fillers are graphene nanoplatelets, [9,11,12] carbon nanotubes (CNT), [13][14][15] nanodiamond, [16] nano clay, [17] graphene quantum dots, [18] alumina, [19][20][21] boron nitride, [22] nanosilica, [23] metal nanoparticles, [24,25] nano-carbon aerogels [26] and different filler reinforcements are commercially available nowadays as a single compound material.…”

Viscoelastic and mechanical characterization of graphene decorated with graphene quantum dots reinforced epoxy composites

“…The Fourier transform infrared spectroscopy plot Figure 2 gives the functional group interaction between filler and epoxy that was mentioned George, M. et al 22 The C H stretch observed at 825 and 900 cm −1 and C O stretch observed at 1250 cm −1 for GDGQD epoxy system. The peak at 1550 cm −1 which arises due to C C stretching for the GDGQD, and peak at 1606 cm −1 which arises due to C N stretching in the epoxy.…”

Preparation of multicolor-emissive carbon dots with high quantum yields and their epoxy composites for fluorescence anti-counterfeiting and light-emitting devices

“…All CDs/EP composites have much rougher fracture surfaces than the pure EP matrix, and increased features such as elliptical markings, dimples, cleavage and ripped stripes on the fracture surface of CDs/EP composites may aid in energy dissipation and enhance the crack-resistance ability. 50 Fig. 15 shows the TGA and DMA curves of the CDs/EP composites.…”