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Shape-controlled magneticnanoplatelets of Ni-doped ZnO

synthesized via a chemical precursorAvila, Franza

MatE !

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∗ "otental use as optical transducers, light

emitters, transparent solar cells, acousto-optic media, and photo detectors

∗ #iluted semiconductor magnetic $#MS%materials are doped &ith transition metal

$'M% ions to give them ferromagneticproperties

ZnO

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∗ (as high )urie temp $can retain

ferromagnetism at high temp%∗ "otential applications* magneto-optical

devices, magnetic sensors, +io-sensors

∗ )hemical formula* Zn-NiO

∗ values tested* , ., ./, .0, o.o1, .

ZnO 2 +ased #MS Materials

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∗ Zinc nitrate heahydrate - Zn$NO3%/4!(/O

∗ Nic5el nitrate heahydrate - Ni$NO3%/4!(/O

∗ "olyvinyl alcohol $"6A%

∗ /07 a8ueous N(9O( soln

∗ Sucrose $)/(//O/% solution

Materials

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∗ ./ M Zn$NO3%/4!(/O and -/.11 mM Ni$NO3%/4!(/O

added drop&ise to a "6A-sucrose soln $* &t ratio%∗ 'emp 5ept at !-!0:) under continuous stirring, p(

5ept at ; using N(9O(

∗ Miture cooled to /-/0:) and left for /9 hrs

∗ "recipitate ta5en and &ashed &< methanol, thendried at 0-!:)

∗ "recipitate ground using mortar = pestle, >red for /hours at 0-!:) in air

"rocedure

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∗ ?-ray #i@ractometer

∗ 6-6is Spectrometer

∗ Field Emission SEM

∗ (igh Besolution 'EM

∗ Fluorescence Spectrometer

∗ 6i+rating Sample Magnetometer

Analytical 'echni8ues

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∗ (-+onds from "6A chains attract not only

Ni/C and Zn/C +ut also other "6A chains∗ "6A forms a ring structure, metal ions

accumulate at the center of the ring

∗ Once ring +ecomes full, "6A +ecomes a

capping agent &hich 5eeps metal ions fromfurther adding

∗ N(9O( reacts &ith the accumulated metal

ions

Mechanism

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