PMID- 25462841
OWN - NLM
STAT- MEDLINE
DCOM- 20150916
LR  - 20150112
IS  - 1878-7568 (Electronic)
IS  - 1742-7061 (Linking)
VI  - 13
DP  - 2015 Feb
TI  - Field effect transistors based on semiconductive microbially synthesized 
      chalcogenide nanofibers.
PG  - 364-73
LID - S1742-7061(14)00497-8 [pii]
LID - 10.1016/j.actbio.2014.11.005 [doi]
AB  - Microbial redox activity offers a potentially transformative approach to the 
      low-temperature synthesis of nanostructured inorganic materials. Diverse strains 
      of the dissimilatory metal-reducing bacteria Shewanella are known to produce 
      photoactive filamentous arsenic sulfide nanomaterials by reducing arsenate and 
      thiosulfate in anaerobic culture conditions. Here we report in situ microscopic 
      observations and measure the thermally activated (79 kJ mol(-1)) precipitation 
      kinetics of high yield (504 mg per liter of culture, 82% of theoretical maximum) 
      extracellular As2S3 nanofibers produced by Shewanella sp. strain ANA-3, and 
      demonstrate their potential in functional devices by constructing field effect 
      transistors (FETs) based on individual nanofibers. The use of strain ANA-3, which 
      possesses both respiratory and detoxification arsenic reductases, resulted in 
      significantly faster nanofiber synthesis than other strains previously tested, 
      mutants of ANA-3 deficient in arsenic reduction, and when compared to abiotic 
      arsenic sulfide precipitation from As(III) and S(2-). Detailed characterization 
      by electron microscopy, energy-dispersive X-ray spectroscopy, electron probe 
      microanalysis and Tauc analysis of UV-vis spectrophotometry showed the biogenic 
      precipitate to consist primarily of amorphous As2S3 nanofibers with an indirect 
      optical band gap of 2.37 eV. X-ray diffraction also revealed the presence of 
      crystalline As8S(9-x) minerals that, until recently, were thought to form only at 
      higher temperatures and under hydrothermal conditions. The nanoscale FETs enabled 
      a detailed characterization of the charge mobility ( approximately 10(-5) cm(2) V(-1) s(-1)) 
      and gating behavior of the heterogeneously doped nanofibers. These studies 
      indicate that the biotransformation of metalloids and chalcogens by bacteria 
      enables fast, efficient, sustainable synthesis of technologically relevant 
      chalcogenides for potential electronic and optoelectronic applications.
CI  - Copyright (c) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights 
      reserved.
FAU - McFarlane, Ian R
AU  - McFarlane IR
AD  - Department of Physics and Astronomy, University of Southern California, 920 Bloom 
      Walk, Seaver Science Center 215C, Los Angeles, CA 90089-0484, USA.
FAU - Lazzari-Dean, Julia R
AU  - Lazzari-Dean JR
AD  - Department of Chemistry, University of Southern California, Los Angeles, CA 
      90089-0484, USA.
FAU - El-Naggar, Mohamed Y
AU  - El-Naggar MY
AD  - Department of Physics and Astronomy, University of Southern California, 920 Bloom 
      Walk, Seaver Science Center 215C, Los Angeles, CA 90089-0484, USA; Molecular and 
      Computational Biology Section, Department of Biological Sciences, University of 
      Southern California, Los Angeles, CA 90089-0484, USA. Electronic address: 
      mnaggar@usc.edu.
LA  - eng
PT  - Journal Article
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20141111
PL  - England
TA  - Acta Biomater
JT  - Acta biomaterialia
JID - 101233144
RN  - 0 (Arsenicals)
RN  - 0 (Sulfides)
RN  - 44SIJ800OX (arsenic trisulfide)
SB  - IM
MH  - Arsenicals/*chemistry
MH  - Nanofibers/*chemistry/ultrastructure
MH  - Oxidation-Reduction
MH  - *Semiconductors
MH  - Shewanella/*metabolism
MH  - Sulfides/*chemistry
MH  - *Transistors, Electronic
OTO - NOTNLM
OT  - Arsenic sulfide
OT  - Biogenic materials
OT  - Field effect transistor
OT  - Nanostructures
OT  - Shewanella
EDAT- 2014/12/03 06:00
MHDA- 2015/09/17 06:00
CRDT- 2014/12/03 06:00
PHST- 2014/06/27 00:00 [received]
PHST- 2014/10/03 00:00 [revised]
PHST- 2014/11/04 00:00 [accepted]
PHST- 2014/12/03 06:00 [entrez]
PHST- 2014/12/03 06:00 [pubmed]
PHST- 2015/09/17 06:00 [medline]
AID - S1742-7061(14)00497-8 [pii]
AID - 10.1016/j.actbio.2014.11.005 [doi]
PST - ppublish
SO  - Acta Biomater. 2015 Feb;13:364-73. doi: 10.1016/j.actbio.2014.11.005. Epub 2014 
      Nov 11.