Ded CNTs to Cu metala film performed on electrodes assembled as shown chemically A single HD-CNT within have been ( 70 in diameter and 40 thick) with open-ended CNTs was connected to a metal and employed as a operating m thick) with in Figure S2. A single HD-CNT inside a film ( 70 m in diameter and 40 electrode. To investigate the stability and electrochemical behavior of your fabricated electrodes, cyclic open-ended CNTs was connected to a metal and employed as a operating electrode. To voltammetrythe stability andof [Ru(NH3 )six ]Cl3 behavior M KCl fabricated electrodes, cyclic investigate measurements electrochemical with 0.five with the as a supporting electrolyte had been performed inside the potential window3)6]Cl3 0.1 to 0.5 MV. stripping voltammetry is definitely an voltammetry measurements of [Ru(NH from with -0.five KCl as a supporting electrolyte effective approach for heavy metal detection with various types of electrodes. Therefore, had been performed inside the possible window from 0.1 to -0.five V. Stripping voltammetry is definitely an 2+ stripping evaluation was performed fordetection with variouspotential window of -1.two V, effective approach for heavy metal Pb detection inside the kinds of electrodes. Hence, with CNT u chemically bonded for Pb2+ detection in the possible window of -1.two V, stripping evaluation was performed electrodes because the working electrode. Commercially 2+ offered Pb(NOchemically bondedsolution wasas the to prepareelectrode. solutions in a with CNT u 3 )two within a 2 HNO3 electrodes employed working the Pb Commercially 0.1 M acetate buffer within a two HNO3 resolution was utilised toppb, along with the Pb2+ solutions inside a 0.1 2-Hydroxyhexanoic acid manufacturer readily available Pb(NO3)2 (pH four.three) at concentrations of 200 prepare calibration curves have been 2+ constructed buffer around the existing intensities recorded for ppb, andsolutions. The following M acetate primarily based (pH 4.three) at concentrations of 200 the Pb calibration curves were optimized square wave anodic stripping voltammetry (SWASV) solutions. The following constructed determined by the present intensities recorded for the Pb2+ parameters have been applied: frequency, 15 Hz; amplitude, 0.025 V; deposition possible, -1.two V; potential step, 0.004 V; optimized square wave anodic stripping voltammetry (SWASV) parameters have been applied: and deposition time, 120 s. The stripping peaks had been employed to quantify the Pb concentration.Appl. Sci. 2021, 11,5 of2.5. Instrumentation SEM pictures have been recorded making use of an FEI Apreo scanning electron microscope at acceleration voltages of 55 kV to visualize the CNT cross-sections around the metal surfaces. An EDAX elemental analysis detector coupled with all the similar SEM instrument was applied to analyze the atomic compositions with the samples. The Raman spectra of HD-CNTs attached towards the metal surface have been 2′-Aminoacetophenone medchemexpress collected applying a Renishaw inVia Raman microscope with a HeNe laser as the excitation source (633 nm). FT-IR spectra were collected utilizing a Nicolet 6700 FT-IR instrument to determine the surface functionalization. All electrochemical analyses have been performed working with a PalmSens3 potentiostat/galvanostat. A three-electrode system was utilized having a Ag/AgCl reference electrode in addition to a Pt wire counter electrode unless otherwise specified. three. Results and Discussion Freshly microtomed HD-CNTs from the same fiber were functionalized at their open ends. For this objective, positioning CNTs when sustaining their orientations and protecting their side walls inside the assembly was expected. We achieved this by assembling CNTs into macroscopic fibers, where the CNTs had linear orientati.