Graphene quantum dots/gold electrode and its application in living cell H2O2 detection

Abstract

Due to the high peroxidase-like activity and small lateral size of graphene quantum dots (GQDs), the covalently assembled GQDs/Au electrode exhibits great performance and stability in H(2)O(2) detection. It is better or comparable to some enzyme-immobilized electrodes, and thus could be useful in sensing H(2)O(2) changes in biological systems.

Electrochemical enantiorecognition of tryptophan enantiomers based on graphene quantum dots–chitosan composite film

“…Recent research on GQDs is mainly focused on photoluminescence because of the fluorescent characteristic of GQDs [3][4][5]. Though GQDs have been applied in electrochemical sensing [6][7][8], the applications of GQDs in electrochemical enantiorecognition have not been explored until very recently, which might be due to the absence of chiral center in GQDs. Recently, Trojanowicz [9] reviewed that successful chiral recognition can be achieved via combining multi-walled carbon nanotubes (CNTs) and optically active substances, opening a new avenue in electrochemical enantiorecognition with modified GQDs.…”

Graphene–palladium nanowires based electrochemical sensor using ZnFe2O4–graphene quantum dots as an effective peroxidase mimic

“…The GQDs, prepared through the photo-Fenton reaction of GO have intrinsic peroxidase-like activities. The catalytic property is much higher than the micrometer sized GO, as they have large specific surface area, defect-free aromatic structure and rich periphery carboxylic groups [18]. Another reason is that the size change can efficiently improve the specific surface area and distinct crystal sizes contain different atomic arrangements [19].…”

Graphene quantum dots: Highly active bifunctional nanoprobes for nonenzymatic photoluminescence detection of hydroquinone

“…In addition to the above properties, GQDs consisting of a single-atomic layer of nano-sized carbon nanomaterials, have the excellent performances of graphene. As with grapheme (Song et al, 2010), GQDs have been proved to possess highly-efficient peroxidase-mimicking catalytic activity (Umrao et al, 2015;Zhang et al, 2013), and its activity is much higher than graphene oxide . These unique features of GQDs can be highly exploitable in the development of novel optical sensors.…”