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@inproceedings{1576217, author = {Trachioti, Maria and Hrbáč, Jan and Hemzal, Dušan and Prodromidis, Mamas}, address = {Istanbul}, booktitle = {XX Euroanalysis}, edition = {1}, keywords = {low-cost green sensors; graphite nanomaterials; raman spectroscopy,; scanning electron microscopy; cyclic voltammetry; electrochemical impedance spectroscopy; nitroaromatic explosives}, howpublished = {elektronická verze "online"}, language = {eng}, location = {Istanbul}, pages = {309-309}, publisher = {Istanbul University}, title = {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}, year = {2019} }
TY - JOUR ID - 1576217 AU - Trachioti, Maria - Hrbáč, Jan - Hemzal, Dušan - Prodromidis, Mamas PY - 2019 TI - 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 PB - Istanbul University CY - Istanbul KW - low-cost green sensors KW - graphite nanomaterials KW - raman spectroscopy, KW - scanning electron microscopy KW - cyclic voltammetry KW - electrochemical impedance spectroscopy KW - nitroaromatic explosives N2 - 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. ER -
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 \textit{XX Euroanalysis}. 1. vyd. Istanbul: Istanbul University, 2019, s.~309-309.
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