A new series of (Tl 1−y Bi y )(Ca 1−x Y x )Sr 2 Cu 2 O z superconductors with “1122” structure

Materials Science-Poland

2016

Vanadium dioxide VO 2 has been paid in recent years increasing attention because of its various applications, however, its oxidation resistance properties in air atmosphere have rarely been reported. Herein, VO 2 (B) nanobelts were transformed into VO 2 (A) and VO 2 (M) nanobelts by hydrothermal route and calcination treatment, respectively. Then, we comparatively studied the oxidation resistance properties of VO 2 (B), VO 2 (A) and VO 2 (M) nanobelts in air atmosphere by thermo-gravimetric analysis and differential thermal analysis (TGA/DTA). It was found that the nanobelts had good thermal stability and oxidation resistance below 341°C, 408°C and 465°C in air, respectively, indicating that they were stable in air at room temperature. The fierce oxidation of the nanobelts occurred at 426, 507 and 645°C, respectively. The results showed that the VO 2 (M) nanobelts had the best thermal stability and oxidation resistance among the others. Furthermore, the phase transition temperatures and optical switching properties of VO 2 (A) and VO 2 (M) were studied by differential scanning calorimetry (DSC) and variabletemperature infrared spectra. It was found that the VO 2 (A) and VO 2 (M) nanobelts had outstanding thermochromic character and optical switching properties.

Section: Synthesis Of Vo 2 (B) Nanobeltsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

VO₂(B) conversion to VO₂(A) and VO₂(M) and their oxidation resistance and optical switching properties

Materials Science-Poland

2016

“…The synthesis of VO 2 (B) nanobelts was based on the previous report [25]. In a typical synthesis, 0.455 g of bulk V 2 O 5 was dispersed into 26 mL of redistilled water with magnetic stirring.…”

Section: Synthesismentioning

confidence: 99%

“…The influence of VO 2 (B) nanobelts on thermal decomposition of ammonium perchlorate 561 material for Li-ion battery, not only due to its proper electrode potential, but also its tunnel structure, through which Li-ions can make intercalation and de-intercalation in the reversible Li-ion battery [24,25]. Besides, VO 2 (B) is usually used as a precursor to be transformed to other vanadium oxides by hydrothermal or thermal treatment [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

The influence of VO₂(B) nanobelts on thermal decomposition of ammonium perchlorate

Materials Science-Poland

Tan

Meng

2015

The influence of vanadium dioxide VO 2 (B) on thermal decomposition of ammonium perchlorate (AP) has not been reported before. In this contribution, the effect of VO 2 (B) nanobelts on the thermal decomposition of AP was investigated by the ThermoGravimetric Analysis and Differential Thermal Analysis (TG/DTA). VO 2 (B) nanobelts were hydrothermally prepared using peroxovanadium (V) complexes, ethanol and water as starting materials. The thermal decomposition temperatures of AP in the presence of 1 wt.%, 3 wt.% and 6 wt.% of as-obtained VO 2 (B) nanobelts were reduced by 39°C, 62°C and 74°C, respectively. The results indicated that VO 2 (B) nanobelts had a great influence on the thermal decomposition temperature of AP. Furthermore, the influence of the corresponding V 2 O 5 , which was obtained by thermal treatment of VO 2 (B) nanobelts, on the thermal decomposition of AP was also investigated. The results showed that VO 2 (B) nanobelts had a greater influence on the thermal decomposition temperature of AP than that of V 2 O 5 .

Facile Fabrication of an Ultrasensitive All‐Fabric Wearable Pressure Sensor Based on Phosphorene‐Gold Nanocomposites

Weng

Feng

et al. 2022

Adv Materials Inter

of pressure sensors to meet the needs of wearable electronics in terms of detection sensitivity, response speed, stability and fabrication cost. [9][10][11] Unlike traditional wearable pressure sensors made of Ecoflex, [12] polydimethylsiloxane (PDMS) [13] or thermoplastic polyurethanes (TPU), [14] allfabric pressure sensors are skin-friendly, low cost, easy to fabricate and can be well fitted to skin or uneven surfaces, while remaining high performance, namely high sensitivity, good flexibility and stability, as well as rapid response/relaxation speed.Pressure sensors are typically based on three main types of sensing modalities, capacitance, [15,16] piezoelectricity [17] and piezoresistivity. [18,19] Among them, piezoresistive pressure sensors have been widely used in many applications due to their environmentally friendly fabrication, easy read-out mechanism, low energy consumption in operation and low cost. The basic principle of such sensors is to measure the electrical resistance change resulting from externally induced mechanical stimuli. [18,19] From the viewpoint of practical applications, for example, to monitor subtle pressures induced by small-scale activities such as gentle touch, heartbeat and respiration, low-cost and large-scale manufacturing methods for wearable pressure sensors with high sensitivity, wide linear region, and high mechanical flexibility are highly desired.To date, numerous efforts have been devoted to optimize the performance of piezoresistive pressure sensors through configuration design or materials (including substrates and conductive materials). [20][21][22] In general, there are three typical configurations in piezoresistive pressure sensors, embedding configuration in which the conductive materials are "mixed" in the elastomer, e.g., conductive rubber fibers, [23] planar configuration in which the electrodes are fabricated on the surface of the conductive material [24] and free configuration with a flexible electrode made of fabric. [25][26][27] Elastomers PDMS, [13] Ecoflex, [12] and thermoplastic polyurethanes (TPU) [14] are the most common substrate materials used in piezoresistive pressure sensors, however, these materials present obvious shortcomings such as low stretchability and wearing discomfort, thereby failing to meet the requirements of e-textiles. To overcome the limitations, various approaches have been established in recent Fabric-based sensors play a vital role in the development of wearable and flexible electronics. However, the research of wearable fabric-based sensors with high sensitivity, wearing comfortability, ease of fabrication, superior stability, and fast response time is full of challenges. In this study, an all-fabric flexible and wearable pressure sensor based on phosphorene-gold nanocomposites (BP-AuNCs) is developed. The sensor consists of a pair of screen-printed interdigital carbon electrodes (SPICEs) and a BP-AuNCs decorated fabric electrode. Benefiting from the microstructure of fabric fibers and the unique property of BP-AuNCs, the develo...