Photoelectrochemistry with Controlled DNA-Cross-Linked CdS Nanoparticle Arrays

Abstract

Photochemical detection of a nucleic acid was achieved by means of a DNA‐cross‐linked CdS nanoparticle array attached to an electrode (see schematic diagram). The array was constructed from the target DNA (blue) and CdS nanoparticles bearing oligonucleotides complementary to its 3′‐ (green) and 5′‐ends (red). The photocurrent generated on irradiation of the array increases with increasing concentration of the target.

A New Electrochemical DNA Sensor for Sequence-Specific DNA Detection Based on DNA-functionalized CdS Nanoparticle

“…CdS nanoparticles were prepared according to the literature [7] by using mercaptoacetic acid as the stabilizer. In brief, 9.22 Pl mercaptoacetic acid was added to 50 ml 0.4 mM Cd(NO 3 ) 2 solution, and then the pH was adjusted to 7 with 0.5 M NaOH.…”

Optical and Dynamic Properties of Undoped and Doped Semiconductor Nanostructures

“…Similar to photochemical reactivities, the photoelectrochemical properties of nanoparticles are often quite different from those of their bulk counterparts. For example, structurally controlled generation of photocurrents has been demonstrated for doublestranded DNA-cross-linked CdS nanoparticle arrays upon irradiation with light [247]. The electrostatic binding of [Ru(NH 3 ) 6 ] 3+ to ds-DNA units provides tunneling routes for the conduction band electrons and thus results in enhanced photocurrents.…”

Hydrogen Bonding: A Bottom-Up Approach for the Synthesis of Films Composed of Gold Nanoparticles

“…[16,[17][18][19][20] Hydrogen bonds are more dynamic and flexible in geometry than rigid covalent bonds being very important in the design of supramolecular structures. [21] Most methods to assemble inorganic nanoparticles by hydrogen bonding depend on biomolecular structures, in particular DNA-strands [22,23] and substrate/receptor pairs like biotin and streptavidin [24,25] or polymers dressed with hydrogenbonding moieties. [26] These approaches are characterized by the large size of the binding material compare to the dimensions of the particle cores and this limits their use in applications that depend on the particle-particle interaction.…”