One-pot green synthesis of Ag nanoparticle-decorated reduced graphene oxide composites: effect of Ag/graphene oxide volume ratio and its demonstration as low-voltage on-chip photodetector
One-pot green synthesis of Ag nanoparticle-decorated reduced graphene oxide composites: effect of Ag/graphene oxide volume ratio and its demonstration as low-voltage on-chip photodetector
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DOI：
10.1007/s10853-018-2403-4
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发表时间：
2018-08-01
影响因子：
4.5
通讯作者：
Hashim, Abdul Manaf
中科院分区：
文献类型：
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作者：
Abd Aziz, Nur Suhaili;Nakajima, Yoshikata;Hashim, Abdul Manaf
我们提出了利用抗坏血酸作为绿色还原剂一锅合成银纳米粒子装饰的还原氧化石墨烯（AgNP-rGO）复合材料。研究了Ag(NH3)(2)OH络合物溶液与GO溶液体积比的影响。高含量的 Ag 体积似乎会减慢 GO 的还原速度，从而为 Ag 离子还原成密度更高的纳米颗粒提供高成核位点。同时，由于GO在低Ag体积含量下还原率高，因此产生的纳米颗粒密度较小，粒径较大。该复合材料已成功演示为低压片上光电探测器。 rGO 上高密度 AgNP 的存在导致快速响应 (393 nA/s) 和恢复率 (399 nA/s)，并且由于 AgNP 有效的局域等离子体共振，即使在 1 [V] 的低偏置电压下也具有出色的循环稳定性。探测率和响应率随着AgNP的密度和偏置电压的增加而显着增加，这些值可以从1 [V]时的3.58 x 10(5) cm Hz(1/2) W-1和2.2 x 10(-6) A/W增加到2.12 x 10(8) cm Hz(1/2) W-1和3.8 x 10(-2)对于含 Ag 体积的样品，A/W 分别为 20 [V] 75%。
We present one-pot synthesis of silver nanoparticle-decorated reduced graphene oxide (AgNP-rGO) composite by utilizing ascorbic acid as a green reduction agent. The effect of volume ratio between Ag(NH3)(2)OH complex solution and GO solution was studied. High content of Ag volume seems to slower down the reduction of GO, hence providing high nucleation sites for the Ag ions to be reduced to nanoparticles with much higher density. Meanwhile, due to high reduction rate of GO at low content of Ag volume, it produces less density of nanoparticles with larger particle size. The composite was successfully demonstrated as a low-voltage on-chip photodetector. The presence of high-density AgNPs on rGO results to fast response (393 nA/s) and recovery rate (399 nA/s) with excellent cyclic stability even at low biasing voltage of 1 [V] due to the effective localized plasmon resonance of AgNPs. The detectivity and responsivity remarkably increase with the densities of AgNPs and the biasing voltages, where these values can increase from 3.58 x 10(5) cm Hz(1/2) W-1 and 2.2 x 10(-6) A/W at 1 [V] up to 2.12 x 10(8) cm Hz(1/2) W-1 and 3.8 x 10(-2) A/W at 20 [V], respectively, for the sample with Ag volume of 75%.