Self‐Assembly of Nanoparticles on Live Bacterium: An Avenue to Fabricate Electronic Devices

Berry, Vikas; Saraf, Ravi F.

doi:10.1002/ange.200501711

Cited by 20 publications

(26 citation statements)

References 35 publications

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“…The compensation process is expected to be enhanced because of the high mobility of the chains due to surface-influenced mobility, as reported in the literature by noting a significantly lower T g of surface chains compared to bulk chains [18]. Furthermore, we conjecture, similar to the high density deposition of nanoparticles on bacteria [19], the ~18 kDalton PS chains could wrap around the negatively charged nanoparticles to screen their charges from neighboring particles. The screening will reduce interparticle repulsion, thus leading to the observed high deposition density.…”

Section: Introductionsupporting

confidence: 64%

Selective assembly of nanoparticles on block copolymer by surface modification

Niu

Saraf

2007

Nanotechnology

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Block copolymers have long been recognized as scaffolds to pattern nanoparticles to construct hybrid structures for various electronic [1], optical [2,3] and optoelectronic [4] applications. Earlier studies focused on synthesizing nanoparticles selectively on the nanoscopic elements of the block copolymer [5,6] to obtain ordered structures and fabricate nanodevices, such as nanowires [7]. In other studies, the hierarchical self-assembly of nanoparticles in a nanoparticle-block copolymer mixture was demonstrated where the particles were selectively drawn towards one of the components of the ordered block copolymer morphology [8][9][10]. Based on the possibility of coupling the thermodynamic ordering of the block copolymer and the selective interaction of nanoparticles with the components of the block copolymer, spontaneous ordering of nanoparticles is theorized [11][12][13] and experimentally demonstrated [14,15]. In this paper we describe a method to selectively deposit pre-synthesized nanoparticles on a (preformed) ordered block copolymer surface using a simple approach where one of the nanoscopic polymer domains is selectively functionalized using reactive plasma.PS-PI-PS tri-block copolymer, supplied by Dexco, was deposited on a Si (silicon) substrate as a thin film by spincasting a 1% solution in toluene. Spinning speed was 3,000 rpm and spinning time was 30 s. Initial thickness of the film is 26-28 nm as confirmed by ellipsometry. Molecular weights (MW) of the two PS and central PI blocks are 18,000 Daltons each and 64,000 Daltons, respectively. The isoprene block has 92% 1,4 addition. The molecular weight ratio of PS to PI results in cylindrical morphology [16,17]. The film was processed by the "solvent annealing" procedure [17] and then was baked for 20 min in vacuum at 50 °C. Next, the film was exposed to corona discharge performed in 85% relative humidity air under ambient pressure and temperature for 3 min (moderate etching) or 4 min (deep etching), followed by a thorough rinse with DI (deionized) water. After the film was dried with air flow, it was exposed to 45 W ammonia plasma at a pressure of 580 mTorr for 10 s. Immediately after plasma treatment, the film was immersed into 10 nm Au nanoparticle solution (purchased from BBinternational) for 8-24 h. The Au nanoparticle surface is negatively charged by ClO 4 − groups (as-received). Concentration of the Au nanoparticles is 5.7 × 10 12 particles ml −1 . Prior to use, the pH of the Au nanoparticle solution was adjusted by addition of diluted HCl solution (pH = 1.5) to a value of ~5. No salt was added. Finally, the film was vigorously washed with DI water and dried in air flow.In Figure 1, tapping mode atomic force microscope (AFM) images of the film prior to corona treatment (Figure 1(a)), after corona treatment under moderate (Figure 1(b)) and deep etching (Figure 1(c)) are compared. With moderate etching (Figure 1(b)), while the lateral morphology is intact, the height difference between the crest and trough, Δh, is 6 nm, compared AbstractWe have de...

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Section: Introductionsupporting

confidence: 64%

Selective assembly of nanoparticles on block copolymer by surface modification

Niu

Saraf

2007

Nanotechnology

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“…For instance, Berry et al reported a self-assembly strategy to build hybrid devices that use the biological response of a microorganism to control the electrical properties of the system [34]. In this system, a monolayer of gold NPs was coated onto the peptidoglycan membrane of a live Gram-positive bacterium, as shown in Figure 1e.…”

Section: Design and Synthesis Of Biomimetic Nanostructuresmentioning

confidence: 99%

Bottom-Up Synthesis and Sensor Applications of Biomimetic Nanostructures

Wang

Sun

et al. 2016

Materials

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The combination of nanotechnology, biology, and bioengineering greatly improved the developments of nanomaterials with unique functions and properties. Biomolecules as the nanoscale building blocks play very important roles for the final formation of functional nanostructures. Many kinds of novel nanostructures have been created by using the bioinspired self-assembly and subsequent binding with various nanoparticles. In this review, we summarized the studies on the fabrications and sensor applications of biomimetic nanostructures. The strategies for creating different bottom-up nanostructures by using biomolecules like DNA, protein, peptide, and virus, as well as microorganisms like bacteria and plant leaf are introduced. In addition, the potential applications of the synthesized biomimetic nanostructures for colorimetry, fluorescence, surface plasmon resonance, surface-enhanced Raman scattering, electrical resistance, electrochemistry, and quartz crystal microbalance sensors are presented. This review will promote the understanding of relationships between biomolecules/microorganisms and functional nanomaterials in one way, and in another way it will guide the design and synthesis of biomimetic nanomaterials with unique properties in the future.

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“…18 Both methodologies essentially have inherent drawbacks such as the usage of hazardous chemicals and the need for multiple steps of preparation. [21][22][23][24][25][26] Several nanoparticles including SiO 2 , TiO 2 , Ga 2 O 3 , Au, halloysite nanotubes and NdFeB have been assembled onto biological cells to form nanocomposites. 19,20 The use of living single cells such as fungi, yeast, bacteria and spores was considered an environment friendly, simple and nontoxic alternative for the preparation of novel functional microspheres.…”

Section: Introductionmentioning

confidence: 99%

Naturally nano: synthesis of versatile bio-inpired monodisperse microspheres from Bacillus spores and their applications

et al. 2016

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A novel class of bionanocomposites based on monodisperse microparticles containing metal nanoparticles including Au, Pd, Ag and Pt were synthesized and characterized using a simple and efficient approach. The versatile nanocomposites exhibited unique possibilities as new biosensor for highly selective and sensitive immunoassays as well as a remarkable enhancement in catalytic activity in the reduction of 4-nitrophenol selected as model reaction which illustrated their potential in various different applications.Scheme 1 Spore-based hybrid microspheres loaded with highly dispersed noble metal nanoparticles and their applications in heterogeneous catalysis and immunoassay.

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Self‐Assembly of Nanoparticles on Live Bacterium: An Avenue to Fabricate Electronic Devices

Cited by 20 publications

References 35 publications

Selective assembly of nanoparticles on block copolymer by surface modification

Selective assembly of nanoparticles on block copolymer by surface modification

Bottom-Up Synthesis and Sensor Applications of Biomimetic Nanostructures

Naturally nano: synthesis of versatile bio-inpired monodisperse microspheres from Bacillus spores and their applications

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