Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 22, Pages 11741-11747Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5078478
Keywords
molecularly imprinted polymer; graphene quantum dots; fluorescence; polyindole; dopamine; affinity-adjustable
Funding
- National Natural Science Foundation of China [51272100, 51273073]
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A facilely prepared fluorescence sensor was developed for dopamine (DA) determination based on polyindole/graphene quantum dots molecularly imprinted polymers (PIn/GQDs@MIPs). The proposed sensor exhibits a high sensitivity with a linear range of 5 x 10(-10) to 1.2 x 10(-6) M and the limit of detection as low as 1 x 10(-10) M in the determination of DA, which is probably due to the tailor-made imprinted cavities for binding DA thought hydrogen bonds between amine groups of DA and oxygen-containing groups of the novel composite. Furthermore, the prepared sensor can rebind DA in dual-type: a low affinity type (noncovalent interaction is off) and a high affinity type (noncovalent interaction is on), and the rebinding interaction can be adjusted by tuning the pH, which shows a unique potential for adjusting the binding interaction while keeping the specificity, allowing for wider applications.
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