AgBiS2纳米晶体上ZnS壳生长近红外发光的出现

IF 7 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Asim Onal, Tarik Safa Kaya, Önder Metin, Sedat Nizamoglu
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引用次数: 0

摘要

AgBiS2纳米晶体(NCs)由无毒、富含地球的材料组成,从可见光到近红外(>105 cm-1)具有极高的吸收系数,有望用于光伏发电,但由于固有的非辐射重组和具有挑战性的壳生长,缺乏光致发光(PL)。在这项研究中,我们报道了一种简单的湿化学方法用于ZnS壳在AgBiS2 NCs上的外延生长,这引发了近红外(764 nm)的PL发射观测。由于高质量的核心对于外延壳的生长至关重要,我们首先通过双配体方法将Ag-Bi油酸盐与油胺中的单质硫反应,获得了具有高结晶度、近球形和单分散尺寸分布(<6%)的岩盐结构AgBiS2 NCs。接下来,通过高活性的锌(Zn(acac)2)前驱体,在制备的AgBiS2 NCs上生长出低晶格错配率为4.9%的锌闪锌矿ZnS壳,其光致发光量子产率(PLQY)达到15.3%,而相对较低的反应性前驱体(Zn(ac)2)导致PLQY降低。具有超强吸收的AgBiS2 NCs的发射,在壳生长的促进下,可以在照明,显示和生物成像方面开辟新的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Emergence of Near-Infrared Photoluminescence via ZnS Shell Growth on the AgBiS2 Nanocrystals

Emergence of Near-Infrared Photoluminescence via ZnS Shell Growth on the AgBiS2 Nanocrystals
AgBiS2 nanocrystals (NCs), composed of nontoxic, earth-abundant materials and exhibiting an exceptionally high absorption coefficient from visible to near-infrared (>105 cm–1), hold promise for photovoltaics but have lack of photoluminescence (PL) due to intrinsic nonradiative recombination and challenging shell growth. In this study, we reported a facile wet-chemical approach for the epitaxial growth of ZnS shell on AgBiS2 NCs, which triggered the observation of PL emission in the near-infrared (764 nm). Since high quality of the core is critical for epitaxial shell growth, we first obtained rock-salt structured AgBiS2 NCs with high crystallinity, nearly spherical shape and monodisperse size distribution (<6%) via a dual-ligand approach reacting Ag–Bi oleate with elemental sulfur in oleylamine. Next, a zincblende ZnS shell with a low-lattice mismatch of 4.9% was grown on as-prepared AgBiS2 NCs via a highly reactive zinc (Zn(acac)2) precursor that led to a higher photoluminescence quantum yield (PLQY) of 15.3%, in comparison with a relatively low reactivity precursor (Zn(ac)2) resulting in reduced PLQY. The emission from AgBiS2 NCs with ultrastrong absorption, facilitated by shell growth, can open up new possibilities in lighting, display, and bioimaging.
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来源期刊
Chemistry of Materials
Chemistry of Materials 工程技术-材料科学:综合
CiteScore
14.10
自引率
5.80%
发文量
929
审稿时长
1.5 months
期刊介绍: The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.
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