Using amber poly(ethylene terephthalate) waste to obtain carbon microneedles

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects Pub Date : 2025-09-26 DOI:10.1016/j.nanoso.2025.101557

L.C. Chagüendo-Figueroa , D.F. Coral , G. Bolaños-Pantoja , J.E. Diosa , E. Mosquera-Vargas , J.E. Rodríguez-Páez

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Abstract

A plastic waste, amber poly(ethylene terephthalate) (PET), was used to obtain carbon microneedles, using iron oxide microparticles (IOMPs) that acted as nucleation points to favor the growth of the carbon structure. The IOMPs were synthesized using the precipitation method, in atmospheres of air and of nitrogen and characterized via X-ray diffraction (XRD), IR and EDAX spectroscopy, as well as scanning electron microscopy (SEM). The synthesized particles showed magnetite (Fe₃O₄) as their main crystalline phase, a submicron size and a morphology that varied depending on the atmosphere used: spheroidal and laminar, in air, and spherical, on using nitrogen. The amber PET was then placed on quartz substrates previously impregnated with IOMPs, to be subjected to a pyrolysis process at 700 °C. These carbon-based structures were found to have an acicular morphology, with a submicron width, and length in the micron range. These showed an elemental chemical composition of ∼ 95 % (wt%) C, ∼ 2.6 % (wt%) O, ∼ 2.4 % (wt%) Si and ∼ 0.4 % Fe, on average.

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利用琥珀聚对苯二甲酸乙酯废料制备碳微针

以塑料废料琥珀聚对苯二甲酸乙酯（PET）为原料，利用氧化铁微粒（IOMPs）作为成核点，促进碳结构的生长，制备了碳微针。采用沉淀法在空气和氮气气氛中合成了IOMPs，并通过x射线衍射（XRD）、红外光谱（IR）和EDAX光谱（EDAX）以及扫描电子显微镜（SEM）对其进行了表征。合成的颗粒以磁铁矿（Fe3O4）为主要晶相，尺寸为亚微米，形貌随所用气氛的不同而变化：在空气中呈球形和层流状，在使用氮气时呈球形。然后将琥珀PET放置在先前浸渍了IOMPs的石英衬底上，在700°C下进行热解过程。这些碳基结构具有针状形态，宽度为亚微米，长度在微米范围内。这些样品的元素化学组成平均为~ 95 % (wt%) C、~ 2.6 % (wt%) O、~ 2.4 % (wt%) Si和~ 0.4 % Fe。

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来源期刊

Nano-Structures & Nano-Objects Physics and Astronomy-Condensed Matter Physics

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

22 days

期刊介绍： Nano-Structures & Nano-Objects is a new journal devoted to all aspects of the synthesis and the properties of this new flourishing domain. The journal is devoted to novel architectures at the nano-level with an emphasis on new synthesis and characterization methods. The journal is focused on the objects rather than on their applications. However, the research for new applications of original nano-structures & nano-objects in various fields such as nano-electronics, energy conversion, catalysis, drug delivery and nano-medicine is also welcome. The scope of Nano-Structures & Nano-Objects involves: -Metal and alloy nanoparticles with complex nanostructures such as shape control, core-shell and dumbells -Oxide nanoparticles and nanostructures, with complex oxide/metal, oxide/surface and oxide /organic interfaces -Inorganic semi-conducting nanoparticles (quantum dots) with an emphasis on new phases, structures, shapes and complexity -Nanostructures involving molecular inorganic species such as nanoparticles of coordination compounds, molecular magnets, spin transition nanoparticles etc. or organic nano-objects, in particular for molecular electronics -Nanostructured materials such as nano-MOFs and nano-zeolites -Hetero-junctions between molecules and nano-objects, between different nano-objects & nanostructures or between nano-objects & nanostructures and surfaces -Methods of characterization specific of the nano size or adapted for the nano size such as X-ray and neutron scattering, light scattering, NMR, Raman, Plasmonics, near field microscopies, various TEM and SEM techniques, magnetic studies, etc .