Low-Temperature Production of Genuinely Amorphous Carbon from Highly Reactive Nanoacetylide Precursors

Judai, Ken; Iguchi, Naoyuki; Hatakeyama, Yutaka

doi:10.1155/2016/7840687

Cited by 15 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The combustion of amorphous carbon starts at around 150 °C. 41 Hence, weight loss at a range from 150 to 350 °C can be attributed to the carbon combustion in our sample. As shown in Figure 1d, the carbon residue in the sample was around The high-resolution TEM image (Figure 1c) showed a lattice spacing of 0.32 nm, which corresponds to the (011) orientation for the VO 2 (M1) phase.…”

Section: ■ Results and Discussionmentioning

confidence: 78%

See 1 more Smart Citation

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Kabir

Yang

Kayani

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Thin films composed of vanadium dioxide (VO2), a well-known thermochromic material with reversible insulator-to-metal-transition near room temperature, are intriguing for intelligent and energy-efficient heat-blocking applications. However, the conventional vacuum-based deposition methods often involve a high-temperature annealing process, and oxidation of VO2 under air exposure further limits their practical applications. In this work, we demonstrate a room-temperature solution process to prepare VO2-based thermochromic thin films using a smart ink composed of crystalline VO2 nanoparticles. To enhance their chemical stability against oxidation and assist in the uniform deposition of the VO2 thin films, polymers were used as both capping agents and for surface modification of the VO2 nanocrystals. Specifically, the concentration of VO2 nanocrystals, the type of polymers, and the molar ratio between VO2 and polymers are systematically tailored, and their effects on the thermochromic performance are also explored. It is revealed that the inclusion of optimum polymers enhanced the thermochromic performance with an almost 4-fold increase in IR switching with a visible luminous transmittance of 86% and a solar modulation of 17.61%. In addition, the inks are compatible with an array of scalable manufacturing processes. We demonstrate uniform films on different substrates, both rigid and flexible, by dip coating, drop casting, and screen printing, offering great feasibility for further scaling up.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 78%

“…Thus, thermogravimetric analysis (TGA) was carried out to verify the content of carbon in the product. The combustion of amorphous carbon starts at around 150 °C . Hence, weight loss at a range from 150 to 350 °C can be attributed to the carbon combustion in our sample.…”

Section: Resultsmentioning

confidence: 79%

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Kabir

Yang

Kayani

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The common spectra of carbon compounds have two notable peaks at about 1355 cm -1 (D band) and 1600 cm -1 (G band). The value of R (I D /I G ) is used to define the degree of disordering in [46,47]. The same pattern of Raman spectra was also exhibited in the elimination of methylene blue dye by utilizing rawactivated carbon [48].…”

Section: Eds Analysismentioning

confidence: 79%

“…The value of R (I D /I G ) is used to define the degree of disordering in carbon-based materials. ID and IG were determined for the integral intensities of D and G peaks of this spectrum [46, 47]. The same pattern of Raman spectra was also exhibited in the elimination of methylene blue dye by utilizing raw-activated carbon [48].…”

Section: Resultsmentioning

confidence: 99%

Adsorptive Removal of Alizarin Red S onto Sulfuric Acid-Modified Avocado Seeds: Kinetics, Equilibrium, and Thermodynamic Studies

Balji

Kumar

2022

Adsorption Science & Technology

View full text Add to dashboard Cite

The present work evaluates the synthesis of a novel, inexpensive, and environmentally friendly chemically-treated avocado seed powder (CTASP) as an adsorbent in removing alizarin red S (ARS) from synthetic solution. By using a set of analytical techniques, including FTIR, XRD, EDX, RS, and SEM, the adsorbent was characterized for its physical and chemical properties. Batch study experiments were conducted to determine the effectiveness of the CTASP as an adsorbent. The maximum adsorption capacity of 67.08 mgg-1 was attained at optimum conditions of 3 gL-1 adsorbent dosage, pH 3, contact time of 30 min, and at temperature 303 K. After 30 minutes, the equilibrium was reached, and the experimental data was explained for isotherm, kinetic, and thermodynamic processes. The results indicated that pseudo-second-order kinetics and the Freundlich isotherm were the best fits for the data. The findings of the analysis of the thermodynamic parameters for the process showed that the system was an exothermic and spontaneous. According to the desorption studies, 0.1 M NaOH can be utilized as a separating reagent to desorb 90.53% of ARS that was adsorbed. Regeneration experiments were conducted to make the process more practical and affordable, and it was discovered that the CTASP adsorbent could be successfully regenerated up to four times. In comparison with other adsorbents, the current low-cost adsorbent had the exceptional regenerative capability and delivered multilayer adsorption capacity. Additionally, it has been demonstrated that the CTASP is an effective material for the detoxification of ARS dye from wastewater.

show abstract

“…However, there were broad spectra with no clear peak was observed at 500°C which indicated the formation of amorphous carbon. The amorphous carbon is a mixture of sp 2 and sp 3 hybridized bonds without crystalline structure (Judai et al, 2016) which is different from the graphitic structure such as CNTs, graphite and graphene that have a well-defined crystalline structure with carbon atoms having sp 2 bonding (Aqel et al, 2012; 2013a). Amorphous carbon is found to be harmful to the growth of CNTs due to its role in inhibiting the catalyst by attaching itself on the surface of the catalyst, since there are no peak observed (Marton et al, 2013).…”

Section: Raman Spectra Analysismentioning

confidence: 99%

Effect of Reaction Temperature on the Growth of Carbon Nanotubes from Waste Natural Rubber Glove

Hazan¹,

Mohamad²,

Hamid³

et al. 2020

JST

View full text Add to dashboard Cite

Natural rubber (NR) glove disposal is not environmentally appropriate and a range of approaches have been suggested to overcome the problem. Herein we indicate a simple method for producing high-value nanotubes from waste NR glove as a partial solution to the environmental problem. The laboratory-based waste NR glove was selected as a carbon precursor. Carbon nanotubes (CNTs) were synthesized using chemical vapor deposition (CVD) method comprising ferrocene over SiO2 substrate, which acted as a catalyst and surface for the carbon conversion process. The growth temperature was varied using 500, 600 and 700°C. The carbon precursor was analyzed using thermogravimetric analysis (TGA) to determine the optimum thermal decomposition of the waste. The CNTs collected after CVD process were analyzed using Raman spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM). Optimization studies to determine the effect of temperature showed that the highest yield of CNTs was produced under a reaction temperature of 700°C (yield % = 5.47%, Raman ID/IG ratio = 0.82). The nanomaterials formed confirmed as CNTs and amorphous carbon under TEM images of the tubular structure of the products with a diameter range of 13 – 16 nm.

show abstract

Low-Temperature Production of Genuinely Amorphous Carbon from Highly Reactive Nanoacetylide Precursors

Cited by 15 publications

References 17 publications

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Adsorptive Removal of Alizarin Red S onto Sulfuric Acid-Modified Avocado Seeds: Kinetics, Equilibrium, and Thermodynamic Studies

Effect of Reaction Temperature on the Growth of Carbon Nanotubes from Waste Natural Rubber Glove

Contact Info

Product

Resources

About

Low-Temperature Production of Genuinely Amorphous Carbon from Highly Reactive Nanoacetylide Precursors

Cited by 15 publications

References 17 publications

Solution-Processed VO2 Nanoparticle/Polymer Composite Films for Thermochromic Applications

Solution-Processed VO2 Nanoparticle/Polymer Composite Films for Thermochromic Applications

Adsorptive Removal of Alizarin Red S onto Sulfuric Acid-Modified Avocado Seeds: Kinetics, Equilibrium, and Thermodynamic Studies

Effect of Reaction Temperature on the Growth of Carbon Nanotubes from Waste Natural Rubber Glove

Contact Info

Product

Resources

About

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications