Nondestructive covalent functionalization of carbon nanotubes by selective oxidation of the original defects with K2FeO4

An NMR Metabolomics Approach and Detection ofGanoderma boninense-Infected Oil Palm Leaves Using MWCNT-Based Electrochemical Sensor

“…Electrode. The modified electrode was prepared according to the method described previously [18][19][20][21][22]. Layer-by-layer (LBL) assembly was employed to modify the electrode The bare screen-printed carbon electrode (SPCE) was rinsed several times with deionized water and immersed into gold nanoparticle-carbon nanotube (AuNP-CNT) dispersion for 5 min.…”

Derivatized Carbon Nanotubes for Gene Therapy in Mammalian and Plant Cells

“…However, this method suffers from loss in the electronic properties of CNTs thereby making them ineffective for optical applications. [33] As of now, Zhang et al in 2015 [34] and Signer et al in 2018 [35] invented the green strategy for functionalization with À COOH groups by utilizing potassium ferrate and hydrogen peroxide (H 2 O 2 ) separately. Another example of green oxidation was reported by Wei et al where they used a mechanical grinding technique to shorten the length of nanotube followed by Piranha-type oxidation by using hydroxyl radicals.…”

Dry Chemistry of Ferrate(VI): A Solvent‐Free Mechanochemical Way for Versatile Green Oxidation

“…Based on the above,w ee xtended the solvent-free ferrate(VI) chemistry to the oxidation of inorganic carbon materials,i ncluding multi-walled and single-walled CNTs (MWNTs and SWNTs), in order to 1) verify the versatility of such ferrate(VI) oxidation, 2) investigate the reactivities of ferrate(VI) towards different carbon structures and 3) achieve genuinely green oxidation compared to the K 2 FeO 4 / H 2 SO 4 method. [8,9] Theo xidation was found very efficient for MWNTs.T he surface O/C ratio,detected by X-ray photoelectron spectroscopy (XPS,s urface semi-quantitative), increased from 3.5 % to 11.3 %a fter only 2h (Figure 3a), and the bulk O/C ratio measured by elemental analysis (EA) was improved from 1.6 %t o4 .1 %. Effective carboxylation at the surface was achieved with evident -COOH peaks in C1sand O1sspectra (Figure 3b,c) as well as infrared adsorption at 1740 cm À1 ( Figure S12).…”

“…[3] Theh exavalent iron endows ferrate(VI) with very strong oxidizing ability (higher redox potentials than those of most traditional oxidants,f or example,K MnO 4 ,K 2 Cr 2 O 7 ,H NO 3 ,C l 2 ,H 2 O 2 ,O 3 ), [4] and its nontoxic reduction product Fe III and the abundance of iron on earth make it ag reen and sustainable oxidant. [3, 4a] In the past few decades,m any efforts have been devoted to employing ferrate(VI) as an oxidizing agent for green organic synthesis, [3b, 5] high-capacity battery, [6] and water purification, [3a, 4, 7] which greatly improved our understanding on its reactivity and performance.R ecently,f errate(VI) was also utilized for the oxidation of carbon materials,f or example,m odification of carbon nanotubes (CNTs) [8] and preparation of graphene oxides. [9] In these studies,K 2 FeO 4 / H 2 SO 4 was suggested as arelatively greener oxidation system to replace the traditional HNO 3 /H 2 SO 4 or KMnO 4 /H 2 SO 4 .At the same time,c oncern was also raised regarding the instability of K 2 FeO 4 in acidic H 2 SO 4 environment that could result in the loss of its oxidizing power.…”