Isolation of water soluble carbon nanotubes with network structure possessing multipodal junctions and its magnetic property

Dubey, Prashant; Sonkar, Sumit Kumar; Majumder, Sutripto; Tripathi, Kumud Malika; Sarkar, Sabyasachi

doi:10.1039/c3ra22933e

Cited by 34 publications

(32 citation statements)

References 47 publications

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“…This peak refers to the π ‐ π * and n ‐ π * transition of conjugated C═C and C═O bonds. Moreover, this particular peak at 275 nm and the long tail to 600 nm suggest the occurrence of CDs, and they are in accordance with the information provided in previous articles . This CD solution also shows a strong photoluminescence (PL) spectra (blue line) at 450 nm when excited at 345 nm.…”

Section: Resultssupporting

confidence: 91%

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A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

et al. 2019

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In this study, we have reported the synthesis of luminescent carbon dots (CDs) from indigenous potato sources by simple heating reactions. The as‐synthesized CDs exhibited an average size of ~ 5.97 nm with a quantum yield (QY) of 6.08%. Furthermore, the CDs possessed high water‐solubility, possibly due to the presence of ─COOH and ─OH groups on their surfaces. The quenching of luminescence of the CDs specifically by Cr6+ and Fe3+ ions was used to detect chromium and iron in the water sample. The minimum limit of detection (LOD) for Cr6+ and Fe3+ ions was found to be 0.012 μM and 0.000549 μM, respectively, in a linear range of 0.5 μM‐100 μM and 0.5 μM‐5 μM for Cr6+ and Fe3+, respectively, which was well below the concentration specified by WHO. We used our sensing system to detect the metal ions in water from the Brahmaputra River as well as in tannery water. In addition, the MTT‐based cell viability experiments showed that the CDs were nontoxic within 200 μg/mL. High quantum yield and the easy uptake of CDs enabled the quick labelling of cytoplasm of the HeLa cells, which can be further attributed to bioimaging applications.

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Section: Resultssupporting

confidence: 91%

“…The peak at 1396 cm −1 signifies the bending vibration of C─H. All of these results related to the FTIR peaks are in agreement with previous articles . An elemental analysis was also conducted on the prepared CD samples.…”

Section: Resultssupporting

confidence: 89%

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

et al. 2019

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“…Moreover along with this peak a long tail till 540 nm can also be observed which suggests the occurrence of CDs according to the previously reported articles. [24][25][26] Figure 1b shows the photoluminescence property of the CD. The figure illustrates the dependency of photoluminescence intensities of the CD solution on different excitation wavelength ranging 305-405 nm.…”

Section: Resultsmentioning

confidence: 99%

“…All these results related to the FTIR peaks are in agreement with the previously reported articles. 6,25 Proceedings of the Nanotech France 2019 International Conference Paris, France -June 26 -28, 2019 DOI: https://doi.org/10.26799/cp-nanotechfrance2019 We used the photoluminescent property of CD to detect Cr 6+ in water sample. Figure 2a shows the photluminescence (PL) intensity decay of CD solution along with the addition of Cr 6+ in the solution.…”

Section: Resultsmentioning

confidence: 99%

Crossbar Architecture for Memristor Based Memory Simulation

Seshan¹,

Negi²,

He³

2019

Nanotech France 2019 Conference Proceedings

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The acoustoelectric effect is the generation of a acoustoelectric current in a non-biased device by a piezoactive acoustic wave. This effect has recently attracted the attention of researchers as possible method to control the motion of massive objects in the quantum regime. We suggest use this effect for development of high sensitive nanoelectronic sensors. The sensitivity could be increase through the use of modulation mode of operation based on the acoustic pilot signal and the transition from quasi-stationary measurement to measurement at the modulation frequency. The acoustic delay line based on shear-horizontal acoustic wave of zero order (SH 0 ) with resonant frequency 2.77 MHz in Y-X LiNbO 3 plate was produced. The nanostructure consisting of nanowire with size 20nm x 180nm was placed in the center between IDTs. The volt-ampere characteristics of this nanowire in presence and at the absence of the acoustic wave were meazured by picoampermeter. The analysis has shown that presence of piezoactive acoustic wave is influenced on electric current in a nanowire.Keywords: acoustoelectric effect, nanowire, volt-ampere characteristics, shear-horizontal acoustic wave, lithium niobate plate, sensor applications Experimental Fabrication of the Acoustic Delay LineThe acoustic delay line and the system of electrodes supplied to the nanostructure were produced as follows. First, the lithium niobate substrate was washed in a centrifuge with a stream of isopropyl alcohol and acetone, and then wiped with dimethylformamide. Then, a Shipley S1813 resist was applied by the centrifuge, after that it was dried for 5 minutes on HotPlate at a temperature of 115 0 C. The corresponding photomask was superimposed on the sample in the MA-750 combining unit and the structure was exposed to UV radiation at a wavelength of 400 nm for 75 seconds at an intensity of 50 mW /cm 2 . Next, the sample was placed for 1 minute in a KOH-based developer with a concentration of 0.01 mg/ml. After that, thermal evaporation of 100 nm of titanium and 30 nm of gold on top of it was sputtered through the obtained photoresist mask. Then, using the lift-off method, the sample was freed from the remnants of the undeveloped photoresist, and the result was a structure of IDT and supply electrodes for the nanostructure. The geometry size of obtained delay line was 11mm x 13mm with substrate thickness 0.35mm. Fabrication of the Central NanostructureAfter production of the delay line, the corresponding nanostructure was placed between the IDT. To produce it, we used an electron lithography method with a two-layer overhanging resistive mask. This approach allows to avoid low-quality edges due to the contact of the sprayed metal with the walls of the photoresist and to obtain rather sharp boundaries of metal nanostructures [6]. In result of modified method we obtained central nanostructure with geometry size 80x80 m 2 .This structure consisted of eight nanowires. Each nanowire was 180nm in length, 20nm in width and with thickness about 77nm (chromium -7nm, gold-50...

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“…Recently, carbon-based nanomaterials have received wide attention and application due to their outstanding properties, including mechanical performance 10 , 11 , self-assembly of multipodal junctions with interesting magnetic properties 12 , energy storage performance 13 and electrical properties 14 , 15 . In particular, CNTs have been the subject of intense experimental research that indicates it is an ideal candidate material for the preparation of next-generation electronic devices with a narrow current channel and enhanced performance 16 – 22 .…”

Section: Introductionmentioning

confidence: 99%

A Cu-atom-chain current channel with a width of approximately 0.246 nm on (5, 0) single-wall carbon nanotube

Wang

Zhu

Shao

2017

Sci Rep

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Continuous miniaturization with improved performance has enabled the development of electronic devices. However, further shrinking of electronic circuits will push feature sizes (linewidths) firmly into the nanoscale. This can cause electronic devices built using current materials (silicon-based) and fabrication processes to not work as expected. Therefore, new materials or preparation technologies are needed for the further miniaturization of electron devices. Here, through theoretical simulation, we show that regular doping of a Cu-atom chain on a single-wall carbon nanotube (SWCNT) can be used to realize an atomic-scale current channel (Cu-atom-chain current channel) with a linewidth of approximately 0.246 nm. Moreover, the atomic-scale Cu-atom-chain current channel shows enhanced conductivity (lower power consumption) compared to a pristine SWCNT. Such a Cu-atom-chain current channel with an atomic-scale linewidth and its method of fabrication (regular doping) may be suitable for the preparation of nanoelectronic devices.

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Isolation of water soluble carbon nanotubes with network structure possessing multipodal junctions and its magnetic property

Cited by 34 publications

References 47 publications

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

Crossbar Architecture for Memristor Based Memory Simulation

A Cu-atom-chain current channel with a width of approximately 0.246 nm on (5, 0) single-wall carbon nanotube

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