生物 PbS 量子点的表征,International Journal of Molecular Sciences

当前位置： X-MOL 学术 › Int. J. Mol. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

生物 PbS 量子点的表征
International Journal of Molecular Sciences ( IF 4.9 ) Pub Date : 2023-09-15 , DOI: 10.3390/ijms241814149
Yoshiko Okamura _{1,

2,

3,

4} , Ryo Shimizu ₂ , Yoriko Tominaga _{2,

4,

5} , Sachiko Maki _{4,

6} , Tsunehiro Aki _{1,

2,

3} , Yukihiko Matsumura _{3,

5} , Yutaka Nakashimada _{1,

2,

3}

Affiliation

污染环境中的重金属对生命有毒。然而，一些微生物可以通过生物矿化去除或固定重金属。这些细菌还形成成分与半导体相似的矿物质。在这里，这种生物工艺被用来制造低能耗和低成本的半导体。对形成硫化铅（PbS）纳米颗粒的细菌进行了筛选，并对所得纳米颗粒的结晶度和半导体特性进行了表征。获得了形成 PbS 纳米颗粒的细菌聚生体。胞外粒径范围为3.9～5.5 nm，观察到晶格条纹。晶格条纹和电子衍射光谱对应于结晶 PbS。细菌 PbS 的 X 射线衍射（XRD）图显示出清晰的衍射峰。多晶PbS各晶面衍射角的实验数据与理论数据吻合良好。同步加速器 XRD 测量显示没有结晶杂质衍生的峰。因此，细菌生物矿化可以形成超细结晶 PbS 纳米颗粒。获得 PbS 的光吸收和电流-电压测量来表征半导体特性；结果显示了半导体量子点的行为。此外，当使用 PbS 纳米粒子时，在光照射下电流增加。这些结果表明生物 PbS 具有带隙并表现出半导体的一般基本特征。

"点击查看英文标题和摘要"

Characterization of Biogenic PbS Quantum Dots

Heavy metals in a polluted environment are toxic to life. However, some microorganisms can remove or immobilize heavy metals through biomineralization. These bacteria also form minerals with compositions similar to those of semiconductors. Here, this bioprocess was used to fabricate semiconductors with low energy consumption and cost. Bacteria that form lead sulfide (PbS) nanoparticles were screened, and the crystallinity and semiconductor properties of the resulting nanoparticles were characterized. Bacterial consortia that formed PbS nanoparticles were obtained. Extracellular particle size ranged from 3.9 to 5.5 nm, and lattice fringes were observed. The lattice fringes and electron diffraction spectra corresponded to crystalline PbS. The X-ray diffraction (XRD) patterns of bacterial PbS exhibited clear diffraction peaks. The experimental and theoretical data of the diffraction angles on each crystal plane of polycrystalline PbS were in good agreement. Synchrotron XRD measurements showed no crystalline impurity-derived peaks. Thus, bacterial biomineralization can form ultrafine crystalline PbS nanoparticles. Optical absorption and current–voltage measurements of PbS were obtained to characterize the semiconductor properties; the results showed semiconductor quantum dot behavior. Moreover, the current increased under light irradiation when PbS nanoparticles were used. These results suggest that biogenic PbS has band gaps and exhibits the general fundamental characteristics of a semiconductor.

更新日期：2023-09-16

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文