Nanodiamond-derived carbon nano-onions decorated with silver nanodendrites as an effective sensing platform for methamphetamine detection

Electrochemical Rapid Detection of Methamphetamine from Confiscated Samples Using a Graphene-Based Printed Platform

“…Simultaneously with the increase in the current intensity, a cathodic shift of the peak potential from 0.985 V to 0.674 V was also observed. This behavior suggests the involvement of an equal number of protons and electrons in the electro-oxidation mechanism of MAP, as previously reported [9,21]. The influence of pH on the behavior of a 100 µM MAP solution was tested using SWV in the pH range of 7 to 12 (Figure 3A).…”

“…The effect of pH on the peak potential can be explained by considering the theoretical pKa value of MAP, which is 9.5, indicating the predominant presence of its deprotonated form in the analyzed solution. It can be seen in Figure 1 that MAP undergoes irreversible electrochemical transformation [1], a process for which the most predictable mechanism that can be imagined is based on the oxidation of the secondary amine in the MAP structure that occurs more readily in alkaline conditions than in acidic conditions, which aligns with the pKa value of MAP (pKa = 9.5) [21,22]. This phenomenon occurs because the oxidative process is facilitated by the abstraction of an electron from the lone pair of electrons on the amino-nitrogen atom, confirming that the oxidation site of MAP is located on the secondary amino group.…”

“…The oxidation peak potential (E p,ox ) is linearly dependent on the pH value (Figure 3C) under a regression equation of E p,ox (V) = −0.061 pH + 1.619 (R 2 = 0.988), with the value of the slope very close to that of the Nernst equation. This suggests that the electrochemical transformation mechanism of MAP on the GPH-based sensor involves an equal number of protons and electrons [1,21].…”

Investigating the electrochemical profile of methamphetamine to enable fast on-site detection in forensic analysis

“…Finally, the suitability of the electrochemical method for on-site screening of suspected cargos was evaluated at NICC, Belgium on several seized samples containing MA (sample 1-19) or other illicit drugs (sample [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Two sampling methods were investigated: (i) underloading and (ii) overloading as explained in the "Experimental section".…”

Noble metal nanodendrites: growth mechanisms, synthesis strategies and applications

“…The diverse synthesis approaches of nanodendrites materials allow them easy to maneuver their physicochemical properties, which leads to a wide range of applications, such as biosensors, [167][168][169][170] batteries, 171 organic catalyses, [172][173][174] electrochemiluminescence (ECL) and others. [175][176][177][178][179][180][181] Here, we mainly summarize the extensive utilization of nanodendrites in electrocatalysis. In addition, biosensing and therapeutic applications are also briefly described.…”