Structural and functional stabilities of artificially designed DNA ultra-thin films grown by silica Assistance

Lee, Junwye; Koo, Jonghyun; Hwang, Si Un; Min, Sunmin; Ahn, Sang Jung; Roh, Yonghan; Park, Sungha

doi:10.1016/j.cap.2012.02.061

“…The ∆ V TH values of Ln-DNA-doped MoS 2 and WSe 2 transistors increased 15–20%, indicating the weakening of the n-type doping effects after 120 hours. The ∆ V TH values of the Co-DNA-doped samples also decreased (Eu- or Gd-based Co-DNA) or increased (Tb- or Er-based Co-DNA) as a function of air exposure time because of the reduced dipole moment of the phosphate backbone (PO 4 − ) and lanthanide ions (Ln 3+ ) related to the humidity-associated structural deformation of Ln- and Co-DNA nanostructures 46 .…”

Section: Resultsmentioning

confidence: 99%

Ultra-low Doping on Two-Dimensional Transition Metal Dichalcogenides using DNA Nanostructure Doped by a Combination of Lanthanide and Metal Ions

Kang

¹

,

Dugasani

²

,

Park

³

et al. 2016

Sci Rep

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Here, we propose a novel DNA-based doping method on MoS2 and WSe2 films, which enables ultra-low n- and p-doping control and allows for proper adjustments in device performance. This is achieved by selecting and/or combining different types of divalent metal and trivalent lanthanide (Ln) ions on DNA nanostructures, using the newly proposed concept of Co-DNA (DNA functionalized by both divalent metal and trivalent Ln ions). The available n-doping range on the MoS2 by Ln-DNA is between 6 × 109 and 2.6 × 1010 cm−2. The p-doping change on WSe2 by Ln-DNA is adjusted between −1.0 × 1010 and −2.4 × 1010 cm−2. In Eu3+ or Gd3+-Co-DNA doping, a light p-doping is observed on MoS2 and WSe2 (~1010 cm−2). However, in the devices doped by Tb3+ or Er3+-Co-DNA, a light n-doping (~1010 cm−2) occurs. A significant increase in on-current is also observed on the MoS2 and WSe2 devices, which are, respectively, doped by Tb3+- and Gd3+-Co-DNA, due to the reduction of effective barrier heights by the doping. In terms of optoelectronic device performance, the Tb3+ or Er3+-Co-DNA (n-doping) and the Eu3+ or Gd3+-Co-DNA (p-doping) improve the MoS2 and WSe2 photodetectors, respectively. We also show an excellent absorbing property by Tb3+ ions on the TMD photodetectors.

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Template‐Assisted Self‐Assembly: Alignment, Placement, and Arrangement of Two‐Dimensional Mesostructured DNA–Silica Platelets

Liu

¹

,

Yao

²

,

Che

³

2013

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Highly ordered hierarchical biomolecule-inorganic structures, such as bone, dentine, eggshell, and marine mollusc shells, are ubiquitous in nature. [1] The artificial organization of nature-inspired, biomolecule-templated hierarchical inorganic materials is a key challenge in enabling many nanotechnological applications.[2] "Bottom-up" self-assembly is a widely applied strategy for synthesizing and fabricating ordered hierarchical/multilevel spatial structures or morphologies from components ranging from nanometers to micrometers in size. Alternatively, "top-down" lithographic approaches allow for arbitrary geometrical designs and superior nanometer-level precision, accuracy, and registration. Template-assisted self-assembly (TASA) combines bottom-up self-assembly with top-down patterned templates to eliminate defects and induce registration and orientation in thin-film materials, providing rich opportunities to produce biomimetic multilevel hierarchies. [3] Using TASA, the orientation and periodicity of zerodimensional (0D) spherical block copolymer microdomains, colloid crystals, and metal nanoparticles and 1D metal oxide nanotubes/nanowires were guided into 2D/3D hierarchical spatial architectures. [3a,d, 4] In these systems, the use of biomolecular building blocks has attracted great attention because of their biocompatibility, inherent molecular-recognition properties, and facile use in bottom-up fabrication. Recently, DNA origami-like triangles (with precise banding of gold nanocrystals) were successfully placed and oriented on lithographically patterned surfaces. [5] These systems are the most typical examples of selectively aligning 2D assemblies to date. The successful selective alignment, placement, and arrangement of anisotropic 2D/3D hierarchically mesostructured assemblies with sufficient long-range order, however, have rarely been reported. [6]

show abstract

Template‐Assisted Self‐Assembly: Alignment, Placement, and Arrangement of Two‐Dimensional Mesostructured DNA–Silica Platelets

Liu

¹

,

Yao

²

,

Che

³

2013

View full text Add to dashboard Cite

Highly ordered hierarchical biomolecule-inorganic structures, such as bone, dentine, eggshell, and marine mollusc shells, are ubiquitous in nature. [1] The artificial organization of nature-inspired, biomolecule-templated hierarchical inorganic materials is a key challenge in enabling many nanotechnological applications.[2] "Bottom-up" self-assembly is a widely applied strategy for synthesizing and fabricating ordered hierarchical/multilevel spatial structures or morphologies from components ranging from nanometers to micrometers in size. Alternatively, "top-down" lithographic approaches allow for arbitrary geometrical designs and superior nanometer-level precision, accuracy, and registration. Template-assisted self-assembly (TASA) combines bottom-up self-assembly with top-down patterned templates to eliminate defects and induce registration and orientation in thin-film materials, providing rich opportunities to produce biomimetic multilevel hierarchies. [3] Using TASA, the orientation and periodicity of zerodimensional (0D) spherical block copolymer microdomains, colloid crystals, and metal nanoparticles and 1D metal oxide nanotubes/nanowires were guided into 2D/3D hierarchical spatial architectures. [3a,d, 4] In these systems, the use of biomolecular building blocks has attracted great attention because of their biocompatibility, inherent molecular-recognition properties, and facile use in bottom-up fabrication. Recently, DNA origami-like triangles (with precise banding of gold nanocrystals) were successfully placed and oriented on lithographically patterned surfaces. [5] These systems are the most typical examples of selectively aligning 2D assemblies to date. The successful selective alignment, placement, and arrangement of anisotropic 2D/3D hierarchically mesostructured assemblies with sufficient long-range order, however, have rarely been reported. [6]

show abstract

Structural and functional stabilities of artificially designed DNA ultra-thin films grown by silica Assistance

Cited by 5 publications

References 20 publications

Ultra-low Doping on Two-Dimensional Transition Metal Dichalcogenides using DNA Nanostructure Doped by a Combination of Lanthanide and Metal Ions

Ultra-low Doping on Two-Dimensional Transition Metal Dichalcogenides using DNA Nanostructure Doped by a Combination of Lanthanide and Metal Ions

Template‐Assisted Self‐Assembly: Alignment, Placement, and Arrangement of Two‐Dimensional Mesostructured DNA–Silica Platelets

Template‐Assisted Self‐Assembly: Alignment, Placement, and Arrangement of Two‐Dimensional Mesostructured DNA–Silica Platelets

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