Nickel nanoparticle deposition at room temperature for memory applications

Verrelli, E.; Tsoukalas, D.; Giannakopoulos, K.; Kouvatsos, Dimitrios N.; Normand, P.; Ioannou, D.E.

doi:10.1016/j.mee.2007.04.078

Cited by 34 publications

(18 citation statements)

References 2 publications

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“…1 Compared to semi-conductive (Si,Ge) 2,3 and organic (C, graphene) 4,5 charge storage candidates, noble metal nanoparticles (Pt, 6 Au 7 and Ag 8 ) embedded in oxide dielectric films (Al 2 O 3 , HfO x , ZrO 2 , TiO 2 , HfAlO x ) have been highlighted due to their high work function and excellent charge properties, but they are not suitable for large-scale industrial applications due to their high cost. Ni nanocrystals (Ni-NCs) has a high work function of 5.35 eV, 9 stable chemical properties, and have been reported to exhibit a memory window width (flat-band voltage shift |∆ V FB |) ranging from 1 to 20 V, [10][11][12][13][14][15][16] showing excellent charge storage capacity. However, due to the oxidization of Ni-NCs in oxide matrix and diversify of nickel oxides, the endurance and retention properties for Ni-NCs-based memory cell need to be further improved.…”

Section: Introductionmentioning

confidence: 99%

Charge storage and tunneling mechanism of Ni nanocrystals embedded HfOx film

et al. 2016

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A nano-floating gate memory structure based on Ni nanocrystals (NCs) embedded HfOx film is deposited by means of radio-frequency magnetron sputtering. Microstructure investigations reveal that self-organized Ni-NCs with diameters of 4-8 nm are well dispersed in amorphous HfOx matrix. Pt/Ni-NCs embedded HfOx/Si/Ag capacitor structures exhibit voltage-dependent capacitance-voltage hysteresis, and a maximum flat-band voltage shift of 1.5 V, corresponding to a charge storage density of 6.0 × 1012 electrons/cm2, is achieved. These capacitor memory cells exhibit good endurance characteristic up to 4 × 104 cycles and excellent retention performance of 105 s, fulfilling the requirements of next generation non-volatile memory devices. Schottky tunneling is proven to be responsible for electrons tunneling in these capacitors.

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Section: Introductionmentioning

confidence: 99%

Charge storage and tunneling mechanism of Ni nanocrystals embedded HfOx film

et al. 2016

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“…9, 10, 11 Nickel thin films have attracted attention due to their catalytic activity and electrical properties. 12,13 …”

Section: Introductionmentioning

confidence: 99%

Enhancement of the colorimetric response of enzymatic reactions by thermally evaporated plasmonic thin films: application to glial fibrillary acidic protein

et al. 2015

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We report the enhancement of the colorimetric response of horseradish peroxidase (HRP) and alkaline phosphatase (AP) in bioassays by thermally evaporated silver, gold, copper and nickel thin films. In this regard, a model bioassay based on biotin-avidin interactions was employed. Biotin groups and enzymes were introduced to all surfaces using a biotinylated linker molecule and avidin, respectively. The colorimetric response of HRP in the model bioassay carried out on the plasmonic thin films were up to 4.4-fold larger as compared to control samples (i.e., no plasmonic thin films), where the largest enhancement of colorimetric response was observed on silver thin films. The colorimetric response of AP on plasmonic thin films was found to be similar to those observed on control samples, which was attributed to the loss of enzymes from the surface during the bioassay steps. The extent of enzymes immobilized on to plasmonic thin films was found to affect the colorimetric response of the model bioassay. These findings allowed us to demonstrate the use of silver thin films for the detection of glial fibrillary acidic protein (GFAP), where the colorimetric response of the standard bioassays for GFAP was enhanced up to 67% as compared to bioassays on glass slides.

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“…Most of the work carried out on magnetic materials has been done on Fe, Co and their alloys due to their strong magnetism. However, the only works found about Ni nanoparticles fabricated with a sputtering source are dedicated to the study of magnetic properties of nanoparticles below 15 nm and their applications [10,11]. Ni is a little weaker magnetic material but exhibits singular properties.…”

Section: Introductionmentioning

confidence: 99%

“…It exhibits a spin-glass behaviour at low temperatures [13]. Ni nanoparticles embedded in an insulating film have been applied to non-volatile memory developments [11]. All these magnetic properties and applications require a good control on particle size and structure.…”

Section: Introductionmentioning

confidence: 99%