LOW-COST “GREEN” SENSORS BASED ON GRAPHITE NANOMATERIALS PREPARED FROM PENCIL LEADS WITH THE AID OF A 3D POSITIONING SPARKING DEVICE FOR THE SENSITIVE DETECTION OF NITROAROMATIC EXPLOSIVES

TRACHIOTI, Maria, Jan HRBÁČ, Dušan HEMZAL a Mamas PRODROMIDIS. LOW-COST “GREEN” SENSORS BASED ON GRAPHITE NANOMATERIALS PREPARED FROM PENCIL LEADS WITH THE AID OF A 3D POSITIONING SPARKING DEVICE FOR THE SENSITIVE DETECTION OF NITROAROMATIC EXPLOSIVES. Online. In XX Euroanalysis. 1. vyd. Istanbul: Istanbul University, 2019, s. 309-309.

Základní údaje

• Originální název: LOW-COST “GREEN” SENSORS BASED ON GRAPHITE NANOMATERIALS PREPARED FROM PENCIL LEADS WITH THE AID OF A 3D POSITIONING SPARKING DEVICE FOR THE SENSITIVE DETECTION OF NITROAROMATIC EXPLOSIVES
• Autoři: TRACHIOTI, Maria, Jan HRBÁČ, Dušan HEMZAL a Mamas PRODROMIDIS.
• Vydání: 1. vyd. Istanbul, XX Euroanalysis, od s. 309-309, 1 s. 2019.
• Nakladatel: Istanbul University

Další údaje

• Originální jazyk: angličtina
• Typ výsledku: Stať ve sborníku
• Obor: 10405 Electrochemistry
• Stát vydavatele: Turecko
• Utajení: není předmětem státního či obchodního tajemství
• Forma vydání: elektronická verze "online"
• Organizační jednotka: Přírodovědecká fakulta
• Klíčová slova anglicky: low-cost green sensors; graphite nanomaterials; raman spectroscopy,; scanning electron microscopy; cyclic voltammetry; electrochemical impedance spectroscopy; nitroaromatic explosives

Anotace

We report on the straightforward preparation of graphite nanomaterials (GNMs) through a direct graphite-to-substrate electric discharge at ambient conditions at 1.2 kV between pencil leads and low-cost graphite screen-printed electrodes (SPEs). The so-modified sparked GNM-SPE was characterized by Raman spectroscopy, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. GNM-SPE sparked electrodes endowed sensitivity to plain SPEs to the cathodic voltammetric detection of various nitroaromatic explosives. Different commercially available pencil leads including “graphite pencil” (Faber−Castell, Castell 9000) of different degrees of hardness (4H, 2H, HB, 2B and 4B), “high-purity graphite leads” (Pilot, ENO−G, HB), “needle-crystal leads” (Uni-ball, Uni, HB) and “nanodiamonds leads” (Uni-ball, Nano−Dia, HB) were examined. Taking as criterion the highest response to the electro reduction of 2,4,6-trinitrotoluene (TNT), Castell 9000 (2B) pencil was selected as optimum. SPEs that have been modified with 200 sparking cycles showed an excellent repeatability (RSD50ppb = 1.8%, n=5), reproducibility (RSD10ppb = 3.0% and RSD50ppb = 2.8%, n=5) and linear response over the concentration range 1−100 ppb TNT. Data fit the equation I (μA) = (0.0137 ± 0.0002) [TNT(ppb)] − (0.0043 ± 0.0020), R2 = 0.9989, while the limit of detection based on the 3σ/m criterion was calculated 0.44 ppb. The interference effect of other nitroaromatic explosives and masking compounds, which are used to hinder the detection of TNT, was extensively investigated. Moreover, GNM-SPE sparked electrodes were successfully applied to the determination of TNT in drinking water samples fortified with 2, 5 and 10 ppb TNT. Recovery was from 101±8 to 109±7%. Results demonstrated a new type of GNM-SPE low cost electrodes lend themselves to extremely simple preparation while offering enhanced detection capabilities and a wide-scope of applicability. Remarkably, GNM-SPE sparked electrodes can be prepared on-demand, within 3-4 min, through a totally green and solution-free method that requires only a pencil lead and a power supply.