Facile Synthesis of Graphene Quantum Dots from 3D Graphene and their Application for Fe³⁺ Sensing

Abstract

Owing to their small size, biocompatibility, unique and tunable photoluminescence, and physicochemical properties, graphene quantum dots (GQDs) are an emerging class of zero‐dimensional materials promising a wide spectrum of novel applications in bio‐imaging, optical, and electrochemical sensors, energy devices, and so forth. Their widespread use, however, is largely limited by the current lack of high yield synthesis methods of high‐quality GQDs. In this contribution, a facile method to electrochemically exfoliate GQDs from three‐dimensional graphene grown by chemical vapor deposition (CVD) is reported. Furthermore, the use of such GQDs for sensitive and specific detection of ferric ions is demonstrated.

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

“…The limit of detection for Fe 3+ was figured out to be 3.7 μM (=3S/N, where S is the standard deviation and N is the slope of the linear response region at low concentrations less than 20 μm), which is comparable to the sensitivity reported in some previous reports. 46,47 The high sensitivity together with the high selectivity for Fe 3+ makes the CQDs In addition, the selectivity toward Fe 3+ was also ascertained by the competition experiment. As shown in Figure S11, 50 μg/mL of CQD solution was treated with 30 μM Fe 3+ in the presence of 100 μM concentration of other metal ions.…”

Three-Dimensional Porous Architectures of Carbon Nanotubes and Graphene Sheets for Energy Applications

“…Yin et al (2013) used 3D graphene/metal oxide composite for effective capacitive deionization from water. Ananthanarayanan et al (2014) successfully synthesized fluorescent graphene quantum dots from 3D graphene foam. Furthermore, electrochemical sensors based on 3D nanocarbon electrodes offer higher sensitivity or larger detection range as compared to traditional planar electrodes (Dong et al, 2012c,e;Xi et al, 2013).…”

The New Graphene Family Materials: Synthesis and Applications in Oxygen Reduction Reaction

“…Generally, the graphitic materials, such as carbon nanotubes (CNTs) [38,39], carbon fiber [40], grapheme oxide (GO) [41], grapheme [36], graphite [42] and other materials [43][44][45], are usually used as the carbon source to produce GQDs. Chemical acid oxidation [41,46,47], the electrochemical approach [38,48,49], the hydrothermal or solvothermal cutting method [50][51][52] and the physical method [53,54] are employed to synthesize GQDs.…”