Carbon Dot-Functionalized Solution-Gated Graphene Transistors for Highly Sensitive Detection of Cobalt(II) Ions

Abstract

A carbon dot-functionalized solution-gated graphene transistor (CD-SGGT) was designed and prepared via the modification of CDs on the gate of SGGT. The above CDs were hydrothermally synthesized using DL-thioctic acid and triethylenetramine as C, N and S sources. The average size of CDs was ~6.2 nm, and there were many amino and carboxyl groups on the CDs’ surfaces. The CDs was then used as a probe for preparation of CD-SGGT sensor for the cobalt(II) (Co2+) ions detection. The CD-SGGT sensor showed excellent sensitivity and high selectivity. Remarkably, the limit of detection (LOD) reached 10−19 M. The linear detection range was obtained from 10−19 to 10−15 M. Additionally, the CD-SGGT also showed fast response and good stability.

A silicon-doped carbon dot-based multivariate fluorometric and colorimetric probe for the simultaneous detection of heavy metal ions and dopamine

“…2 However, the intake of excessive Co is harmful to human health and can cause negative effects related to heart diseases, dermatitis, asthma, gastrointestinal dysfunction, pneumonia, deafness, and even death by myocardial infarction. 3 Copper (Cu) is the third most predominant trace element in the human body and plays a critical role in many pathological and physiological processes. 4 An excess amount of Cu 2+ is highly toxic to the human body and can cause severe diseases, such as Alzheimer's, Parkinson's, schizophrenia, kidney injury, and so on.…”