Electrophoretic deposition of Au NPs on MWCNT-based gas sensor for tailored gas detection with enhanced sensing properties

Dilonardo, Elena; Penza, M.; Alvisi, Marco; Franco, Cinzia Di; Rossi, Riccardo; Palmisano, Francesco; Torsi, Luisa; Cioffi, Nicola

doi:10.1016/j.snb.2015.09.112

Cited by 62 publications

(29 citation statements)

References 59 publications

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“…X-ray photoelectron spectroscopy (XPS) performed on similar hybrids has shown that three peaks at 283.7±0.2, 284.8±0.2, and 290.4±0.2 eV are due to the sp 2 hybridized graphic carbon atoms, sp 3 hybridization, and π-plasmon excitations, respectively, of C-1s atom in MWCNTs. 44 Decoration of metal catalysts such as Au has introduced new peak in XPS because of Au-4f7/2 at 83.7±0.2 eV. 45 We have recently demonstrated the formation of Au(NP)-MWCNT nanohybrids, 46 which confirmed that both acid treatment and functionalization of Au(NPs) introduced stresses on the surface of MWCNTs as studied by the X-ray diffraction and Raman spectroscopy ( Figures 6-8).…”

Section: Resultsmentioning

confidence: 83%

Role of Au(NPs) in the enhanced response of Au(NPs)-decorated MWCNT electrochemical biosensor

Mehmood

Ciancio

Carlino

et al. 2018

IJN

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BackgroundThe combination of Au-metallic-NPs and CNTs are a new class of hybrid nanomaterials for the development of electrochemical biosensor. Concentration of Au(nanoparticles [NPs]) in the electrochemical biosensor is crucial for the efficient charge transfer between the Au-NPs-MWCNTs modified electrode and electrolytic solution.MethodsIn this work, the charge transfer kinetics in the glassy carbon electrode (GCE) modified with Au(NPs)–multiwalled carbon nanotube (MWCNT) nanohybrid with varied concentrations of Au(NPs) in the range 40–100 nM was studied using electrochemical impedance spectroscopy (EIS). Field emission scanning electron microscopy and transmission electron microscopy confirmed the attachment of Au(NPs) on the surface of MWCNTs.ResultsThe cyclic voltammetry and EIS results showed that the charge transfer mechanism was diffusion controlled and the rate of charge transfer was dependent on the concentration of Au(NPs) in the nanohybrid. The formation of spherical diffusion zone, which was dependent on the concentration of Au(NPs) in nanohybrids, was attributed to result in 3 times the increase in the charge transfer rate ks, 5 times increase in mass transfer, and 5% (9%) increase in Ipa (Ipc) observed in cyclic voltammetry in 80 nM Au(NP) nanohybrid-modified GCE from MWCNT-modified GCE. The work was extended to probe the effect of charge transfer rates at various concentrations of Au(NPs) in the nanohybrid-modified electrodes in the presence of Escherichia coli. The cyclic voltammetry results clearly showed the best results for 80 nM Au(NPs) in nanohybrid electrode.ConclusionThe present study suggested that the formation of spherical diffusion zone in nanohybrid-modified electrodes is critical for the enhanced electrochemical biosensing applications.

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Section: Resultsmentioning

confidence: 83%

Role of Au(NPs) in the enhanced response of Au(NPs)-decorated MWCNT electrochemical biosensor

Mehmood

Ciancio

Carlino

et al. 2018

IJN

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“…The potential of carbon nanotubes (CNTs) in chemical, mechanical, electrochemical sensoring application, nanocomposite material and environmental monitoring is nowadays are incontrovertible [1][2][3][4][5]. Carbon nanotubes (CNTs) can be categorized into two group depending on their number of walls, which are single walled carbon nanotubes (SWCNT) and multi-walled carbon nanotubes (MWCNT).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Amide and Ester Functionalized Multiwalled Carbon Nanotubes

Janudin¹,

Abdullah²,

Abdullah³

et al. 2018

Asian J. Chem.

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Multi-walled carbon nanotubes (MWCNT) were functionalized by different functional group via amidation and esterification process. The MWCNT were treated with H2SO4/HNO3 first to introduce carboxylic acid functional group on the surface of MWCNT. This carboxylic group was used as reaction precursor in the functionalization. There are two functionalizing reactant were used which is dodecylamine, CH3(CH2)11NH2 and 1-octadecanol, CH(CH)17OH. Electron microscopy revealed that the morphology of amide and ester functionalized MWCNT exhibit decrease in their diameter size due to insertion of amide and ester functional group. Raman measurements showed that G-band (graphitic structure) of amide and ester functionalized MWCNT slightly shifted downfield about 6-8 cm-1 due to presence of new functional group on the surface of MWCNT. Multi-walled carbon nanotubes attached to organofunctional element have greater flexibility for further usage in various application fields such as nanocomposite material, biology and chemical sensor and environmental monitoring.

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“…Therefore, CNTs decorated with metal NPs can improve the electrical properties and sensitivity of CNT-based sensors, due to an increase in the number of the adsorption sites for the targeted gases [ 18 ]. CNT sidewalls can be decorated with various noble metals such as Au, Pt, Pd, Rh, and Ag [ 19 – 24 ].…”

Section: Introductionmentioning

confidence: 99%

“…Frequently, these deposition techniques result in an uncontrolled clustering at high metal loading, thus negatively affecting the catalytic properties and integrity of the carbon structure. As a possible solution to overcome these limits, we have proposed an electrophoretic process to directly deposit pre-synthesized colloidal gold NPs of controlled size and loading on the surface of MWCNT-based gas sensor devices [ 19 ]. Moreover, we have demonstrated that the MWCNT sensing properties of functionalized MWCNTs depend on the total surface amount of deposited Au NPs, and therefore, on the surface chemical composition.…”

Section: Introductionmentioning

confidence: 99%

Gas sensing properties of MWCNT layers electrochemically decorated with Au and Pd nanoparticles

Dilonardo¹,

Penza²,

Alvisi³

et al. 2017

Beilstein J. Nanotechnol.

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Multiwalled carbon nanotube (MWCNT)-based chemiresistors were electrochemically decorated with Au and Pd nanoparticles (NPs), resulting in an improvement in the detection of gaseous pollutants as compared to sensors based on pristine MWCNTs. Electrophoresis was used to decorate MWCNTs with preformed Au or Pd NPs, thus preserving their nanometer-sized dimensions and allowing the metal content to be tuned by simply varying the deposition time. The sensing response of unmodified and metal-decorated MWCNTs was evaluated towards different gaseous pollutants (e.g., NO2, H2S, NH3 and C4H10) at a wide range of concentrations in the operating temperature range of 45–200 °C. The gas sensing results were related to the presence, type and loading of metal NPs used in the MWCNT functionalization. Compared to pristine MWCNTs, metal-decorated MWCNTs revealed a higher gas sensitivity, a faster response, a better stability, reversibility and repeatability, and a low detection limit, where all of these sensing properties were controlled by the type and loading of the deposited metal catalytic NPs. Specifically, in the NO2 gas sensing experiments, MWCNTs decorated with the lowest Au content revealed the highest sensitivity at 150 °C, while MWCNTs with the highest Pd loading showed the highest sensitivity when operated at 100 °C. Finally, considering the reported gas sensing results, sensing mechanisms have been proposed, correlating the chemical composition and gas sensing responses.

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Electrophoretic deposition of Au NPs on MWCNT-based gas sensor for tailored gas detection with enhanced sensing properties

Cited by 62 publications

References 59 publications

Role of Au(NPs) in the enhanced response of Au(NPs)-decorated MWCNT electrochemical biosensor

Role of Au(NPs) in the enhanced response of Au(NPs)-decorated MWCNT electrochemical biosensor

Characterization of Amide and Ester Functionalized Multiwalled Carbon Nanotubes

Gas sensing properties of MWCNT layers electrochemically decorated with Au and Pd nanoparticles

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