Size-Dependent Crystal Transition Thermodynamics of Nano-VO₂ (M)

Abstract

Vanadium dioxide exhibits a reversible crystal transition from monoclinic phase to rutile phase, but the quantitative regularity of the effect of particle size on crystal transition thermodynamics still remains unclear. Herein, a new core−shell model was proposed and the universal equations for size-dependent crystal transition thermodynamics have been deduced. Experimentally, we researched the crystal transition behaviors of VO 2 (M) with different particle sizes. The results indicate that with the particle size of nano-VO 2 (M) decreasing, the temperature, enthalpy, and entropy of the crystal transition decrease, and these thermodynamic properties are all linearly related with the reciprocal of particle radius, which are consistent with the theoretical formulas. More importantly, by using the quantitative influence regularity of the particle size on the crystal transition temperature, we can obtain different crystal transition temperatures for different applications by purely controlling the particle sizes.

Development of VO2‐Nanoparticle‐Based Metal–Insulator Transition Electronic Ink

“…In addition, VO 2 also possesses different polymorphisms, including VO 2 (A), [6] VO 2 (B), [7,8] VO 2 (D), [9] VO 2 (M), [10] VO 2 (R), [11] and VO 2 (P). In addition, VO 2 also possesses different polymorphisms, including VO 2 (A), [6] VO 2 (B), [7,8] VO 2 (D), [9] VO 2 (M), [10] VO 2 (R), [11] and VO 2 (P).…”

“…[13] However, the simultaneous creation of polymorphs results in a mixture phase and makes it extremely difficult to achieve a pure VO 2 (M) phase. [10,12] This makes VO 2 a promising material for many practical applications, including sensors, [15] thermochromic smart windows, [16] field effect transistors, [17] radio-frequency (RF) switches, [18] terahertz nanoantennas, [19] reconfigurable antennas, [20] memory, [21] and energy. [10,12] This makes VO 2 a promising material for many practical applications, including sensors, [15] thermochromic smart windows, [16] field effect transistors, [17] radio-frequency (RF) switches, [18] terahertz nanoantennas, [19] reconfigurable antennas, [20] memory, [21] and energy.…”

Capillary transport of two immiscible fluids in presence of electroviscous retardation

“…The direction of the electric current is opposite to that of the pressure driven flow. This observation is termed as the electroviscous retardation, reported for both single phase and multiphase processes [20][21][22][23][24][25][26][27]. On the upside, the generation of an streaming potential may be tapped to convert the fluid mechanical energy into electrical energy -the efficiency of this process is termed as the electrokinetic energy conversion efficiency [18,[28][29][30][31][32][33][34][35][36][37][38].…”

Sonochemical Synthesis of Two Dimensional C3N4 Nanosheets Supported Palladium Composites and Their Electrocatalytic Activity for Oxygen Reduction and Methanol Oxidation Reaction

“…Moreover, Pt alone does not present satisfactory activity and stability for the oxygen reduction reaction (ORR) when used as cathode material. [4,5] What is more, high cost and limited available resources of Pt in the earth, and the sluggish kinetics of the ORR at the cathode are the major obstacles to massive commercial application of fuel cells. The design and fabrication of inexpensive, highly active, and stable catalysts of fuel cells is therefore extremely important and remains challenging.…”