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3D Hierarchical Bi2S 3 Nanostructures by Polyvinylpyrrolidone (PVP) and Chloride Ion-Assisted Synthesis and Their Photodetecting Properties.

Ding T, Dai J, Xu J, Wang J, Tian W, Huo K, Fang Y, Chen C - Nanoscale Res Lett (2015)

Bottom Line: A possible formation mechanism was also proposed on the basis of time-dependent experiments.The photoresponse properties show that the conductivity of Bi2S3 micro-flowers is significantly enhanced and the photocurrent is approximately two orders of magnitude larger than the dark current.It is expected that hierarchical architectures Bi2S3 may provide a new pathway to develop advanced nanomaterial for high-speed and high-sensitivity photoelectrical switches and photodetecting devices.

View Article: PubMed Central - PubMed

Affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, Hubei, People's Republic of China, dtthust@163.com.

ABSTRACT
A solvothermal method has been employed to synthesize bismuth sulfide (Bi2S3) with three-dimensional (3D) hierarchical architectures. The influences of different types of surfactants and Cl(-) species on the size and morphology were investigated. A possible formation mechanism was also proposed on the basis of time-dependent experiments. The photoresponse properties show that the conductivity of Bi2S3 micro-flowers is significantly enhanced and the photocurrent is approximately two orders of magnitude larger than the dark current. The response and decay times are estimated to be 142 and 151 ms, respectively. It is expected that hierarchical architectures Bi2S3 may provide a new pathway to develop advanced nanomaterial for high-speed and high-sensitivity photoelectrical switches and photodetecting devices.

No MeSH data available.


Related in: MedlinePlus

The typical SEM images of Bi2S3 structures synthesized a blank, without surfactants, b CTAB, c SDS, and d PVP
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Fig3: The typical SEM images of Bi2S3 structures synthesized a blank, without surfactants, b CTAB, c SDS, and d PVP

Mentions: It had been reported that surfactants have a very important influence on the morphologies of the products via solvothermal reaction [36–38]. Herein, three different types of surfactants, i.e., SDS, CTAB, and PVP, were added into the solvent-thermal proceeds to investigate the surfactant-dependent morphologies of Bi2S3. Without adding any surfactant, Bi2S3 micro-flowers consisted of nano-cuboids with 110 nm in diameter and 0.5 μm in length could be fabricated, as is shown in Fig. 3a. When SDS and CTAB were added in the solution, the overall morphologies of Bi2S3 have no obvious change. However, when PVP is added in the solution, flower-like Bi2S3 consisting of nanowires could be produced. The aforementioned results indicated that the PVP will be beneficial for the growth of thin nanowires compared with SDS and CTAB surfactants. The main reason may stem from the chelating between the oxygen (and/or nitrogen) of pyrrolidone from the PVP molecules and Bi3+, resulting in selective absorption and growth of various crystallographic planes of Bi2S3 [38]. In addition, PVP may also play a key role in inducing the formation of the flower-like Bi2S3 consisting of nanowires [39]. PVP molecules absorbed on the surface of Bi2S3 nanoparticles could reduce total surface energy of the reaction system; as a consequence, flower-like Bi2S3 assembled by nanowires is produced.Fig. 3


3D Hierarchical Bi2S 3 Nanostructures by Polyvinylpyrrolidone (PVP) and Chloride Ion-Assisted Synthesis and Their Photodetecting Properties.

Ding T, Dai J, Xu J, Wang J, Tian W, Huo K, Fang Y, Chen C - Nanoscale Res Lett (2015)

The typical SEM images of Bi2S3 structures synthesized a blank, without surfactants, b CTAB, c SDS, and d PVP
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496417&req=5

Fig3: The typical SEM images of Bi2S3 structures synthesized a blank, without surfactants, b CTAB, c SDS, and d PVP
Mentions: It had been reported that surfactants have a very important influence on the morphologies of the products via solvothermal reaction [36–38]. Herein, three different types of surfactants, i.e., SDS, CTAB, and PVP, were added into the solvent-thermal proceeds to investigate the surfactant-dependent morphologies of Bi2S3. Without adding any surfactant, Bi2S3 micro-flowers consisted of nano-cuboids with 110 nm in diameter and 0.5 μm in length could be fabricated, as is shown in Fig. 3a. When SDS and CTAB were added in the solution, the overall morphologies of Bi2S3 have no obvious change. However, when PVP is added in the solution, flower-like Bi2S3 consisting of nanowires could be produced. The aforementioned results indicated that the PVP will be beneficial for the growth of thin nanowires compared with SDS and CTAB surfactants. The main reason may stem from the chelating between the oxygen (and/or nitrogen) of pyrrolidone from the PVP molecules and Bi3+, resulting in selective absorption and growth of various crystallographic planes of Bi2S3 [38]. In addition, PVP may also play a key role in inducing the formation of the flower-like Bi2S3 consisting of nanowires [39]. PVP molecules absorbed on the surface of Bi2S3 nanoparticles could reduce total surface energy of the reaction system; as a consequence, flower-like Bi2S3 assembled by nanowires is produced.Fig. 3

Bottom Line: A possible formation mechanism was also proposed on the basis of time-dependent experiments.The photoresponse properties show that the conductivity of Bi2S3 micro-flowers is significantly enhanced and the photocurrent is approximately two orders of magnitude larger than the dark current.It is expected that hierarchical architectures Bi2S3 may provide a new pathway to develop advanced nanomaterial for high-speed and high-sensitivity photoelectrical switches and photodetecting devices.

View Article: PubMed Central - PubMed

Affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, Hubei, People's Republic of China, dtthust@163.com.

ABSTRACT
A solvothermal method has been employed to synthesize bismuth sulfide (Bi2S3) with three-dimensional (3D) hierarchical architectures. The influences of different types of surfactants and Cl(-) species on the size and morphology were investigated. A possible formation mechanism was also proposed on the basis of time-dependent experiments. The photoresponse properties show that the conductivity of Bi2S3 micro-flowers is significantly enhanced and the photocurrent is approximately two orders of magnitude larger than the dark current. The response and decay times are estimated to be 142 and 151 ms, respectively. It is expected that hierarchical architectures Bi2S3 may provide a new pathway to develop advanced nanomaterial for high-speed and high-sensitivity photoelectrical switches and photodetecting devices.

No MeSH data available.


Related in: MedlinePlus