Exfoliation Behavior of van der Waals Strings: Case Study of Bi2S3
Exfoliation Behavior of van der Waals Strings: Case Study of Bi2S3
复制标题
DOI：
10.1021/acsami.8b14702
复制
发表时间：
2018-12-12
影响因子：
9.5
通讯作者：
Kalantar-Zadeh, Kourosh
中科院分区：
文献类型：
--
作者：
Dhar, Nripen;Syed, Nitu;Kalantar-Zadeh, Kourosh
由货车德瓦尔斯力结合在一起的共价键键合的弦组成的晶体家族可以剥落成更小的实体，类似于由货车德瓦尔斯片制成的晶体。取决于这种晶体的各向异性，以及它们在每个方向上的串之间的间距，在剥离过程之后可以获得货车范德华片或带。在这项工作中，我们证明了硫化铋（Bi 2S 3）的纳米带可以通过高功率超声处理过程合成。这些带状物的厚度和宽度由母体晶体中弦周围的货车德瓦耳斯间距决定。纳米带的长度最初受到起始块状颗粒的尺寸的限制。有趣的是，这些纳米带改变化学计量和组成，并延长搅拌的持续时间增加时，因为奥斯特瓦尔德熟化。剥离的货车德瓦尔斯字符串的应用，提出了使用Bi 2S 3纳米带的光致发光的光学生物传感，达到检测限小于10 nM L-1的牛血清白蛋白。剥离货车德瓦耳斯弦的概念可以扩展到一大类晶体，用于创建从片到弦的物体，其光电性质不同于它们的大块对应物。
The family of crystals constituting covalently bound strings, held together by van der Waals forces, can be exfoliated into smaller entities, similar to crystals made of van der Waals sheets. Depending on the anisotropy of such crystals, as well as the spacing between their strings in each direction, van der Waals sheets or ribbons can be obtained after the exfoliation process. In this work, we demonstrate that ultrathin nanoribbons of bismuth sulfide (Bi2S3) can be synthesized via a high-power sonication process. The thickness and width of these ribbons are governed by the van der Waals spacings around the strings within the parent crystal. The lengths of the nanoribbons are initially limited by the dimensions of the starting bulk particles. Interestingly, these nanoribbons change stoichiometry and composition and are elongated when the duration of agitation increases because of Ostwald ripening. An application of the exfoliated van der Waals strings is presented for optical biosensing using photoluminescence of Bi2S3 nanoribbons, reaching detection limits of less than 10 nM L-1 in response to bovine serum albumin. The concept of exfoliating van der Waals strings could be extended to a large class of crystals for creating bodies ranging from sheets to strings, with optoelectronic properties different from that of their bulk counterparts.