1.
FIGURE S1 FTIR spectra of graphite and RGO.
Compared with the Figure 2, it can be seen clearly that the spectrum of RGO is basically
same with graphite after the graphene oxide is reduced. This indicates that the functional
groups on the graphene surface have been basically cleared.
2.
FIGURE S2 XRD patterns of GO and HBP-RGO.
XRD is performed to detect the variations of the layer structure among the samples and
the patterns are depicted in Figure S2. After oxidation, the d-spacing increases from 0.336nm
to 0.786, indicating that the interlayer distance increases due to the various
oxygen-containing groups. The characteristic peak of graphite at 26.5° totally disappears in
GO, and a new peak that belongs to GO occurred at 11.2°, which indicates that graphite has
been fully oxidized.1 The RGO has no obvious XRD diffraction peak. This is one of the symbols
of graphite completely stripped, indicates that graphite oxide has been completely stripped
into the graphene.2 It can be observed that due to the grafting of hyperbranched polytriazine
a wide and low peak appears at 21.3°. This wide and low peak may attribute to the
hyperbranched polytriazine grafted onto the reduced graphene oxide surface and the degree
of order increase.
3.
FIGURE S3 TEM photo of the RGO repeated alternately graft hexamethylene diamine and
cyanuric chloride twice (a) and a new TEM photo of the HBP-RGO (b).
In order to confirm the the surface of RGO covered with hyperbranched polytriazine, we
provide TEM photo of the RGO repeated alternately graft hexamethylene diamine and
cyanuric chloride twice and a new TEM photo of the HBP-RGO in Figure S3. TEM analysis (Fig.
S3a) shows that the RGO surface distributes of a large number of grey black addends. In
contrast, HBP-RGO (Fig. 5b and Fig. S3b) exhibits a different morphology. There are more
addends on the surface of RGO and the addends look like a wound wire clusters (Fig. S3b).
The grey black addends on the surface of RGO can be attributed to the hyperbranched
polytriazine attached onto the RGO surface from both sides.
4.
FIGURE S4 A 3D photo representation of the HBP-RGO surface, 2 μm × 2 μm.
Figure S4 is a 3D representation of the HBP-RGO surface, which provides global
information about height values of the different imaged structures. As can be seen clearly,
the 3D photo of the HBP-RGO surface shows that the addends on it show the dendritic
structure. Comprehensive all the characterization results, it may be able to confirm the
hyperbranched polytriazine has been grafted onto the RGO surface and it shows a dendritic
structure.
5.
FIGURE S5 SEM image of HBP-RGO/PS nanocomposite with 1 wt% loading.
In order to further verify the graphene has obvious agglomeration in PS matrix, a low
magnification photo is provided (Fig. S5). In Figure S5, it can be found that a large amount of
reduced graphene oxide are dispersed in the PS matrix and has obvious agglomration.
REFERENCES
1 L. Tang, Y. Wang, Y. Li, H. Feng, J. Lu, J. Li, Adv. Funct. Mater. 2009, 19, 2782-2789.
2 S. Thakur, N. Karak, ACS Sustain. Chem. Eng. 2014, 2, 1195-1202.