Electrochemical determination of paraquat using a glassy carbon electrode decorated with pillararene-coated nitrogen-doped carbon dots

Supramolecular Chemistry of Carbon‐Based Dots Offers Widespread Opportunities

“…Host‐guest interactions in the CDs area were mainly used for recognition and sensing of analytes, [ 175–179 ] as containers for fluorescent molecules or drugs, [ 180,181 ] and to promote photoinduced electron transfer ( Figure a–c). [ 182,183 ]…”

“…Host-guest interactions in the CDs area were mainly used for recognition and sensing of analytes, [175][176][177][178][179] as containers for fluorescent molecules or drugs, [180,181] and to promote photoinduced electron transfer (Figure 6a-c). [182,183] For enabling CDs to participate in host-guest interactions, the surface groups of the nanoparticles are commonly post-functionalized either covalently with crown ethers, cyclodextrins and others [175] or by employing other supramolecular interactions to assemble the CDs with cucurbituril and calixarenes.…”

Graphene electrochemical transistors decorated by Ag nanoparticles exhibiting high sensitivity for the detection of paraquat over a wide concentration range

“…5b, under the catalysis of the Ag NPs, two reaction peaks appear near −0.65 V and −1.15 V, corresponding to the reduction reactions of PQ 2+ 4 PQ + and PQ + 4 PQ, respectively. 50,51 This means that Ag NPs can efficiently catalyze the reduction reaction of PQ compared to the bare graphene. At the same time, this also determines that if a good electrochemical response signal and a linear quantitative relationship corresponding to the single-electron reaction of the PQ molecule are to be obtained, the selection range of the gate voltage should be between 0.65 V and −1.15 V. More interestingly, the Dirac point of graphene has moved from 0.73 V to about 1.0 V aer modi-cation with Ag NPs, which just avoids coincidence with the reduction potential of PQ, and cleverly makes the linear change interval of the channel current just across the reduction reaction potential of PQ, leaving ample potential movement space to provide convenience for the quantitative detection of PQ.…”

Separation of Low-Molecular-Weight Organics by Water-Soluble Macrocyclic Arenes

“…Their size-specific electron-rich hydrophobic cavities can selectively bind certain molecules through host–guest interactions [ 26 , 27 , 28 ]. The host–guest properties of macrocycles have been extensively applied in the fields of drug delivery [ 29 , 30 , 31 ], water purification [ 32 ], self-assembly [ 33 ], photochromism [ 34 , 35 ], and substance detection [ 36 , 37 , 38 , 39 ]. In particular, the development of pillararene-based macrocyclic arenes has increased rapidly since they were first reported on in 2008, and a variety of expanded versions of macrocyclic arenes, such as leaning pillar[6]arene [ 40 ], biphenyl-extended pillar[6]arene [ 41 ], geminiarenes [ 42 ], leggero pillar[5]arene [ 43 ], and hybrid [n] arenes [ 44 ], have been synthesized.…”