Fabrication of ultra-pure gold nanoparticles capped with dodecanethiol for Schottky-diode chemical gas sensing devices

Ionescu, Radu; Cindemir, Umut; Welearegay, Tesfalem Geremariam; Calavia, R.; Haddi, Z.; Topalian, Zareh; Granqvist, Claes G.; Llobet, Eduard

doi:10.1016/j.snb.2016.07.182

Cited by 18 publications

(18 citation statements)

References 21 publications

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“…In accordance with previous findings [24], the monolayer-capped AuNPs, as well as the monolayer-capped PtNPs, showed a Schottky diode behaviour, while the monolayercapped CuNPs showed a resistor behaviour that is attributed to the formation of the thin Cu2O passivation layer on the nanoparticles surface (figure 11). The electron transport through the nanoassemblies was promoted through the distribution of conducting paths of the core-shell network that is expanded between the two parallel electrodes.…”

Section: Electrical Characterisation Of the Nanomaterials Producedsupporting

confidence: 92%

“…In order to achieve the fabrication of ultrapure monodispersed metal nanoparticles, we have recently introduced an innovative technique based on Advanced Gas Deposition (AGD), which we demonstrated for the fabrication of ultrapure and ultrafine gold nanoparticles (AuNPs) from a gold metal precursor [24]. The AGD process allows for log-normal size distribution of the nanoparticles, and monodisperse, ultrapure nanoparticles can be produced.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous study, the functionalisation of the ultrapure monodispersed AuNPs produced by AGD with dodecanethiol by dip-coating linked the nanoparticles in a metalorganic nanoassembly with novel characteristics, which yielded the first ever observation of Schottky-diodes fabricated from nanomaterials based on metal nanoparticles [24].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and characterisation of ligand-functionalised ultrapure monodispersed metal nanoparticle nanoassemblies employing advanced gas deposition technique

et al. 2018

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Here, we report for the first time the fabrication of ligand-functionalised ultrapure monodispersed metal nanoparticles (Au, Cu, and Pt) from their pure metal precursors using the advanced gas deposition technique. The experimental conditions during nanoparticle formation were adjusted in order to obtain ultrafine isolated nanoparticles on different substrates. The morphology and surface analysis of the as-deposited metal nanoparticles were investigated using scanning electron microscopy, x-ray diffraction and Fourier transform infra-red spectroscopy, which demonstrated the formation of highly ordered pure crystalline nanoparticles with a relatively uniform size distribution of ∼10 nm (Au), ∼4 nm (Cu) and ∼3 nm (Pt), respectively. A broad range of organic ligands containing thiol or amine functional groups were attached to the nanoparticles to form continuous networks of nanoparticle-ligand nanoassemblies, which were characterised by scanning electron microscopy and x-ray photoelectron spectroscopy. The electrical resistance of the functional nanoassemblies deposited in the gap spacing of two microfabricated parallel Au electrodes patterned on silicon substrates ranged between tens of kΩ and tens of MΩ, which is suitable for use in many applications including (bio)chemical sensors, surface-enhanced Raman spectroscopy and molecular electronic rectifiers.

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Section: Electrical Characterisation Of the Nanomaterials Producedsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Fabrication and characterisation of ligand-functionalised ultrapure monodispersed metal nanoparticle nanoassemblies employing advanced gas deposition technique

et al. 2018

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“…Nowadays, nanoparticles and their interactions with other objects are actively used in various applications, e.g., films epitaxy [1], gas sensors [2][3][4], high-temperature superconductors [5][6][7], and luminescent materials development [8,9]. But applications of nanoparticles in biomedicine are especially relevant, e.g., drug delivery [10], cancer therapy [11], enhanced tomography [12], and antiviral and antimicrobial therapy [13,14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Efficiency of Interparticle Interactions in Nanosystems

Demchenko

Rusinchuk

2019

Journal of Nanotechnology

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Wide range of applications of nanoparticles causes the need to study their properties, and the influence of the interparticle interaction on the formation of the nanosystem properties is a well-known experimental phenomenon. The aim of this work is to study the influence of interparticle interactions on the properties of nanosystems theoretically. The influence of the interparticle interaction was simulated based on the near-field interaction potential and local field distribution. The local field distribution in the system was calculated using the Green function method and the concept of the effective susceptibility. The results show that interaction between nanoparticles can be neglected if the distance between them is bigger than the critical one. Expressions for evaluation of the efficiency of the interparticle coupling were proposed and compared with the existing experimental results. The results of the simulation are in good agreement with the measured values of the critical interparticle distance. The approach may be useful for simulation of interactions in the system of many nanoparticles and for engineering of nanostructures for different applications.

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“…The significantly superior results obtained in the present study can be attributed to several betterments that we introduced. On one hand, the sensing material was fabricated employing an innovative technique recently reported by the authors, which allows for the fabrication of ultrapure monolayer-capped metal nanoparticles [ 24 ]. The main advantage of this technique is that the gold nanoparticles are synthesized in vacuum from the melting of a pure metal ( see Materials and Methods section), which ensures the fabrication of ultrapure nanoparticles.…”

Section: Discussionmentioning

confidence: 99%

Exhaled breath analysis for gastric cancer diagnosis in Colombian patients

et al. 2018

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We present here the first study that directly correlates gastric cancer (GC) with specific biomarkers in the exhaled breath composition on a South American population, which registers one of the highest global incidence rates of gastric affections. Moreover, we demonstrate a novel solid state sensor that predicts correct GC diagnosis with 97% accuracy. Alveolar breath samples of 30 volunteers (patients diagnosed with gastric cancer and a controls group formed of patients diagnosed with other gastric diseases) were collected and analyzed by gas-chromatography/mass-spectrometry (GC-MS) and with an innovative chemical gas sensor based on gold nanoparticles (AuNP) functionalized with octadecylamine ligands. Our GC-MS analyses identified 6 volatile organic compounds that showed statistically significant differences between the cancer patients and the controls group. These compounds were different from those identified in previous studied performed on other populations with high incidence rates of this malady, such as China (representative for Eastern Asia region) and Latvia (representative for Baltic States), attributable to lifestyle, alimentation and genetics differences. A classification model based on principal component analysis of our sensor data responses to the breath samples yielded 97% accuracy, 100% sensitivity and 93% specificity. Our results suggest a new and non-intrusive methodology for early diagnosis of gastric cancer that may be deployed in regions lacking well-developed health care systems as a prediagnosis test for selecting the patients that should undergo deeper investigations (e.g., endoscopy and biopsy).

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Fabrication of ultra-pure gold nanoparticles capped with dodecanethiol for Schottky-diode chemical gas sensing devices

Cited by 18 publications

References 21 publications

Fabrication and characterisation of ligand-functionalised ultrapure monodispersed metal nanoparticle nanoassemblies employing advanced gas deposition technique

Fabrication and characterisation of ligand-functionalised ultrapure monodispersed metal nanoparticle nanoassemblies employing advanced gas deposition technique

Evaluation of the Efficiency of Interparticle Interactions in Nanosystems

Exhaled breath analysis for gastric cancer diagnosis in Colombian patients

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