Magnetic, electric and thermal properties of cobalt ferrite nanoparticles

Abstract

The electric and magnetic properties as well as the thermal stability of Co x Fe 3-x O 4 nanopowders, (0.6<x<1.8) were investigated. These powders were synthezised using a one pot solvo-thermal route with acetylacetonates as precursors. The properties were linked to the size, morphology, composition of the particles and to the cation distribution. With the exception of x=0.6, the powders are stable up to 600 °C.

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

“…CoFe 2 O 4 is a hard magnetic material with high coercivity value upto 5.4 kOe and moderate saturation magnetization of ~80emu/g [1,2]. This makes CoFe 2 O 4 an important magnetic material for various applications such as in electronic devices, ferro-fluids, drug delivery system, microwave devices, and high-density information storage [1,2].…”

“…This makes CoFe 2 O 4 an important magnetic material for various applications such as in electronic devices, ferro-fluids, drug delivery system, microwave devices, and high-density information storage [1,2]. Bulk cobalt ferrite possesses inverse spinel structure.…”

“…It has half of the Fe 3+ ions on the A site (tetrahedral) and remaining half of the Fe 3+ ions and all the divalent metal ions situate on the B-site (octahedral). Synthesis of this material in nanoregime induces cation redistribution over A and B sites in the spinel ferrite which leads to magnetic properties different from its bulk counterpart [1][2][3]. Thus nanosized CoFe 2 O 4 is neither completely normal spinel nor completely inverse spinel, but has mixed spinel structure [4,5].…”

“…Thus nanosized CoFe 2 O 4 is neither completely normal spinel nor completely inverse spinel, but has mixed spinel structure [4,5]. Magnetic behavior of this material is not only affected by size of nanoparticles but also influenced by thermal treatment during synthesis and the nature of dopant ions [1,6]. Saturation magnetization of La 3+ doped cobalt ferrite decreases with increasing concentration of La 3+ ions [7].…”

Surface enhanced Raman spectroscopy (SERS) for in vitro diagnostic testing at the point of care

“…It is defined as a group of metabolic diseases where ultimately the body's pancreas does not produce enough insulin or does not properly respond to insulin produced, resulting in high blood sugar levels over a prolonged period. Glucose meters and other POC devices utilize an assortment of methods for detecting and monitoring biomarkers including electrochemical [16][17][18][19][20], magnetic [21][22][23][24][25][26][27][28][29][30], optical [31][32][33][34], label-free spectroscopic analysis [35][36][37][38][39][40][41][42][43], colorimetric [44][45][46][47][48][49], and plasmonic nanoparticle based sensors [50][51][52]. Generally, electrochemical detection uses potentiometric, amperometric, and impedimetric measurements in conjunction with electroactive tags or free flowing electroactive analytes [17][18][19][20] [15,53,54] are examples of electrochemical and colorimet...…”