Electrically transmissive alkyne-anchored monolayers on gold.
Electrically transmissive alkyne-anchored monolayers on gold.
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DOI：
10.1039/c8nr10464f
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发表时间：
2019-04
期刊：
影响因子：
6.7
通讯作者：
L. Herrer;A. González-Orive;Santiago Marqués-González;S. Martín;R. Nichols;J. Serrano;P. Low;P. Cea
中科院分区：
文献类型：
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作者：
L. Herrer;A. González-Orive;Santiago Marqués-González;S. Martín;R. Nichols;J. Serrano;P. Low;P. Cea
1，4-双((4-乙炔基苯基)乙炔)苯(1)在金表面上通过简单的自组装过程得到了有序的、紧密堆积的(表面覆盖率为0.97×10-9molcm-2)单分子膜，利用了容易形成的炔基C-Auσ-键。用[Ru(NH_3)_6]_(3+)，[Fe(CN)_6]_3-和二茂铁基甲醇[Fe(η_5-C_5H_4CH_2OH)(η_5-C_5H5)]氧化还原探针的电化学测量表明，1的炔基C-Au接触单分子膜具有较低的电子转移势垒。这与其他长度和表面覆盖率相同、但具有不同接触基团的低聚(苯乙炔)衍生物在金上的单层膜形成了对比。此外，还观察到了从直接隧穿(矩形势垒)到场发射(三角形势垒)的低电压转变(Vtran=0.51V)。这种低的转变电压指向低的隧道势垒，这与通过1的C-Au接触的自组装单分子膜观察到的简单的电子传输是一致的。
Well-ordered, tightly-packed (surface coverage 0.97 × 10-9 mol cm-2) monolayer films of 1,4-bis((4-ethynylphenyl)ethynyl)benzene (1) on gold are prepared via a simple self-assembly process, taking advantage of the ready formation of alkynyl C-Au σ-bonds. Electrochemical measurements using [Ru(NH3)6]3+, [Fe(CN)6]3-, and ferrocenylmethanol [Fe(η5-C5H4CH2OH)(η5-C5H5)] redox probes indicate that the alkynyl C-Au contacted monolayer of 1 presents a relatively low barrier for electron transfer. This contrasts with monolayer films on gold of other oligo(phenylene ethynylene) derivatives of comparable length and surface coverage, but with different contacting groups. Additionally, a low voltage transition (Vtrans = 0.51 V) from direct tunneling (rectangular barrier) to field emission (triangular barrier) is observed. This low transition voltage points to a low tunneling barrier, which is consistent with the facile electron transport observed through the C-Au contacted self-assembled monolayer of 1.